[go: up one dir, main page]

US1344757A - Arc-lamp - Google Patents

Arc-lamp Download PDF

Info

Publication number
US1344757A
US1344757A US33513A US3351315A US1344757A US 1344757 A US1344757 A US 1344757A US 33513 A US33513 A US 33513A US 3351315 A US3351315 A US 3351315A US 1344757 A US1344757 A US 1344757A
Authority
US
United States
Prior art keywords
arc
lamp
light
chamber
vapors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US33513A
Other languages
English (en)
Inventor
William A Darrah
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric and Manufacturing Co filed Critical Westinghouse Electric and Manufacturing Co
Priority to US33513A priority Critical patent/US1344757A/en
Priority to FR486167A priority patent/FR486167A/fr
Priority to GB835916A priority patent/GB102221A/en
Application granted granted Critical
Publication of US1344757A publication Critical patent/US1344757A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr

Definitions

  • My invention relates to electric lighting, and it has special reference to that class of electric lamps in which the light-giving media are vaporsor gases.
  • my invention relates to electric arc lamps which comprise confined bodies of vapors or gases of light-giving materials that may be continuously introduced to the are without appreciably affecting their light-giving properties.
  • Electric glow lamps have heretofore been constructed which comprise a confined body of a rare gas or vapor, such as neon or ni trogen. In these lamps, however, the initial electrical discharges between the spaced electrodes are occasioned by applying relatively high voltages thereto.
  • the intrinsic brilliancy of lamps of this character is rela tively low, inasmuch as the gases contained therein glow only and no definite arcs appear to exist such as obtain in ordinary. arc lamps. Consequently, it is necessary to employ very large tubes filled with these rare gases in order to generate suflicient candle power for illuminating purposes.
  • Another type of electric lamp employing a body of gas or vapor, as the light-giving medium comprises an electrode of a vaporizable material, such as mercury.
  • a vaporizable material such as mercury.
  • the mercury is ineifective as a light-producing material.
  • the mercury vapor after having served as a conductor for electric current, is usually recondensed and subsequently fed into the arc.
  • a modified form of this type of arc lamp comprises two electrodes between which the initial discharge occurs. The heat generated by the arc vaporizes a body of mercury in conjunction with other light-producing materials so that the arc is bridged by the vapors of a com bined character.
  • the light-giving materials either comprise electrodes which are vaporized when an initial electrical discharge is established, or bodies of vaporizable material which are in proximity to the electrodes Specification of Letters Patent.
  • the electric lamp of the present invention is, in a sense, closely related to the flame carbon arc lamp, inasmuch as the arc is of high intrinsic brilliancy and is maintained in an atmosphere of various lightgivlng materials.
  • the electrodes in my present type of arc lamp are substantially non-consumable in the arc, and the light-giving materials are introduced to the arc in the form of vapors which always surround the arc. These vapors are produced from easily volatilized compounds of light-giving materials and they are maintained, while in the lamp, in a vaporous condition under all circumstances.
  • the arc is continuously fed by these lightproducing vapors of high luminous efficlency, because they are continuously reformed, after having been introduced to the arc, to assume substantially their initial state without affecting their light-giving properties.
  • An object of this invention is to 'provide an electric lamp in which the light may be produced with a very high degree of efiiciency. Again, it is unnecessary to renew the electrodes, inasmuch as they are substantially non-consumable in the arc.
  • the light-giving vapors or gases are introduced into the arc chamber and are used continuously without appreciable deterioration of their light-producing qualities.
  • Figure 1 is a view, partially in elevation and partially in section, of an arc lamp embodying a form of my invention
  • Fig. 2 is an enlarged View, partially in elevation and partially in section, showing the construction of the electrodes embodied in the lamp of Fig. 1
  • Fig. 3 is a sectional view, showing a modified form of the structure of Fig. 2
  • Fig. 4 is a detailed sectional view of the plunger magnet embodied in the arc lamp of Fig. '1
  • Figs. 5, 6, 7 and 8 are views, partially in elevation and partially in section of modified forms of my arc lamp
  • Fig. 1 is a view, partially in elevation and partially in section, of an arc lamp embodying a form of my invention
  • Fig. 2 is an enlarged View, partially in elevation and partially in section, showing the construction of the electrodes embodied in the lamp of Fig. 1
  • Fig. 3 is a sectional view, showing a modified form of the structure of Fig. 2
  • FIG. 9 is a plan view of the guiding means for the upper electrode embodied in the arc lamp of Fig. 8;
  • Fig. 10 is a view, partially in elevation and partially in section, of a portion of an arc lamp embodying my invention and illustrating a method that may be employed in generating and confining the light-giving gases or vapors, and Figs. ll,
  • the confined body of gases or vapor should be so constituted that the decomposition products of the arc recombine to preclude the formation of deposits on the walls of the arc chamber and to permit the light-producing materials to be repeatedly introduced to the arc without substantially affecting the light-giving properties which they initially possess.
  • the confined body of gases or vapors be so constituted (1) that an arc of high luminous efficiency may be produced which results from introducing into the are that class of materials which may be called the illuminants; (2) that a stable arc may be produced which results from introducing materials which may be called stabilizers, and (3) that the decomposition products of the arc may recombine as a result of introducing that class of materials which may be called the catalyzers or catalytic agents.
  • the stabilizers which I have found most satisfactory usually produce arcs which give out a comparatively small amount of light but which have great stability.
  • the volatile compounds of such light-giving materials as titanium, cerium, calcium, tungsten, molybdenum, chromium, thorium, lanthanium and other substances of a similar nature which have been found to be pecul' iarly suitable for use as light-giving materials in flame carbon electrodes, lampglowers, Welsbach mantles, and for similar service.
  • the volatile compounds thereof which, at the temperatures and pressures obtaining within the arc chamber, are in the form of a gas or vapor.
  • those volatile compounds which I have found most suitable are titanium tetrachlorid, tungsten tetrachlorid, boron trichlorid, etc., these ma-' terials being liquids at ordinary temperatures and at atmospheric pressure and being readily volatilizable at pressures slightly below atmospheric pressure. They are, therefore, well adapted for use in arc lamps which are designed to operate at temperatures not greatly above room temperatures.
  • Other light-producing materials which may be satisfactorily used in my arc lamp are cerium chlorid, calcium chlorid, zirconium chlorid, ytterbium chlorid, thorium chlorid,
  • these light-giving materials which comprise halogen elements for the reason that these compounds are comparatively simple in their chemical structure.
  • these lightgiving materials are to be continuously introduced to the arc and, consequently, their chemical construction should be of such a character that their dissociation in the arc, if such occurs, may be readily halted in order that their dissociation products may recombine to assume their original state, so far as their light-giving properties are concerned.
  • sulfates, nitrates, silicates, phosphates and other compounds of complex acid radicals will usually break down in the are into elements or compounds from which the original material cannot be readily reformed.
  • stabilizing materials may be emploved in order to lend stability to the arc, and I have found that antimony penta-chlorid, stannic tetrachlorid, phosphorous trichlorid, arsenic trichlorid, free bromin, free chlorin and other similar materials may be thus utilized.
  • Titanium tetrachlorid is probably dissociated in the arc to form non-volatile titanium bichlorid and trichlorid which, in turn, combine with the bromin to form titanium bromochlorid.
  • Titanium bromochlorid is readilyv volatilized at the temperatures obtaining in the arc lamp, and it will be evident, therefore, that any deposit formed under these conditions will be readily volatilized and thereby pass into the arc, thus keeping the walls of the arc chamber substantially clean.
  • ⁇ Vhen chlorin is used in conjunction with titanium and tungsten compounds, products may be formed which are also readily volatilized at the temperatures obtaining within the lamp.
  • a most satisfactory lamp may be made which comprises a glass container filled with a vapor or gas which comprises approximately 50% of titanium tetrachlorid vapor and 50% of free bromin vapor and having tungsten or hard coke electrodes'disposed therein. If the pressure within the glass container is regulated to approximately 10 centimeters of mercury, it is possible to secure a very steady'arc of high intrinsic brilliancy and of approximately four inches in length, when a direct current at 220 volts is impressed upon the cooperating electrodes.
  • the light generated by this lamp is white and contains luminous bands in all parts of the spectrum.
  • a lamp of this character operates satisfactorily with currents of from 4 to 15 amperes, the quantity of emitted light, of course, being very greatly increased as the current-is increased. While, in this particular lamp, I emplo titanium tetrachlorid, it is possible to su stitute various tungsten chlorids therefor. I have also obtained very satisfactory results by adding small quantities of free chlorin to the vaporous mixture contained in the arc chamber.
  • Another lamp which operates very satisfactorily consists of a transparent quartz container in which two solid electrodes are disposed, one of them containing a small amount of fused cerium chlorid. A little free bromin and free chlorin may be contained in the quartz container which enhances the light-giving properties of the lamp.
  • a containing globe 1 which may be made of any transparent or translucent material, such as glass, quartz, etc., is provided w1th an expanded portion 2 which constitutes the arc chamber of my lamp.
  • a tubular extension 3 is an integral part of the expanded portion 2 and receives the operating mechanism which is associated with an upper electrode 4.
  • the upper electrode 4 cooperates with a lower electrode 4: to establish the arc, the latter electrode being mounted as shown, and connected to a conductor 5 which is sealed into the container 1 by means of a hermetical seal- 6.
  • the upper electrode 4 is rigidly connected to a rod 7 which, in
  • a tubulature 16 which is adapted to be connected to an air pump for exhausting air from the air chamber.
  • the lower portion of the container 1 is connected, through a tubular extension 17, to a filling bottle 18 which is provided, at its lower portion, with a valve 19 that is manually operated by means of an accessible extension 20.
  • Material 21 which, as previously mentioned, may comprise any suitable material, such as titanium tetrachlorid, is contained in the filling bottle 18.
  • an exhaust pump is connected to the tubulature 16
  • the valve 19 is opened in order to permit the material 21 to flow into a bulb 22 which is formed integrally with the tubular extension 17.
  • the valve 19 may be closed. As the pressure within the container 1 decreases, the material contained in the bulb 22 will vaporize because of the decreased pressure obtaining within said container. The exhausting process is continued until it is insured that no gases or vapors will be contained within the container 1 excepting that which evolves from the material contained in the bulb 22.
  • the tubulature 16 is sealed off in any suitable manner along the line A-B, and the tube 17 is likewise sealed 01? along the line CD. It may be desirable to retain the bulb 22 in order that the material contained therein may act as a reserve supply for subsequently evolving gases or vapors to fill the container 1.
  • the container 1 is hermetically sealed, and is also filled with vapors or gases of easily volatilizable compounds of light-giving materials. While the most desirable pressure obtaining within the container 1, depends upon the special gases or vapors employed,
  • the material 21 comprises a mixture of titanium tetrachlorid and bromin.
  • the lamp may be connected in an electrical circuit, the winding of the electromagnet 9 being preferably connected in series relationship with the electrodes 4 and 4*. ()n connecting the lamp in circuit, the coil 9 is energized, thereby actuating the core 8 which, in turn, separates the electrodes 4 and 4 and thus initially establishes the arc.
  • the electrodes are separated and the arc is drawn, it is maintained by the confined body of light-producing gases or vapors contained within the container 1. Inasmuch as the light-producing materials are introduced to the are, it becomes intensely luminous.
  • the characteristics of the arc may be controlled largely by the character of the vaporous materials contained in the arc chamber and by the pressure obtaining therein. Gases and vapors, being'introduced into the arc to add luminosity thereto, are heated to a high temperature and are carried upwardly. Other gases are continuously introduced to the are, thus insuringthe'production ofa steady light. The heated gases, on leaving the arc, become cooled and, if dissociated, recombine to maintain their initial lightgiving properties-intact. This cycle of operation for the light-giving gases and vapors is substantially continuous. While a lamp of this character may be operated either on direct-current or alternating-current circuits, I have secured the best results when operating the lamp upon a directcurrent circuit.
  • the lower electrode 4* which may be made of tungsten, hard coke, or other suitable material, is mounted upon a resilient member or spring 23 and is embraced by a refractory tube 24 which is preferably made of quartz.
  • the upper end of the tube 24 is flared at 25 in order to expose a suflicient portion of the electrode 4 to the are.
  • the upper electrode 4 is likewise embraced by a re fractory tube 26 which is flared at 27.
  • the tubes 24 and 26 prevent the are from creeping along the sides of the electrodes.
  • the upper electrode 4 1s provlded with a central opening 28 that communicates with other openings 28 that extend transversely of the body of the electrode, substantially as shown. I have found this arrangement of openings to be very satisfactory, because the drafts occasioned thereby lend stability to the arc.
  • the arcing end of the electrode 4 is provided with a refractory tubular member 29 that closely embraces 1t, and a second refractory flared member 30 which assists in properly directmg the drafts through the openings 28 and 28".
  • the upper electrode 4, in this instance, is preferably made of hard coke which I have found to be very satisfactory, inasmuch as it is substantially non-consumable in the arc.
  • the core member 8 comprises an iron member having electrical conductors 31 and 7 sealed in its ends.
  • a tube 15 of refractory or non-corrodible material is hermetically sealed around the member 8, thereby preventing it from being attacked by reason of any chemical or heat action occurring in the lamp, It is essential that the outer diameter of the tube 15 be sufficiently small tov permit the core member 8 to slidably engage the tubular extension 3 of the glass container 1.
  • a condensing chamber 32 As shown in Fig. 5.
  • the condensing chamber is above the arc-inclosing chamber 2, and communicates therewith through an opening 32 which is formed bya constriction in the glass container.
  • the condensing chamber 32 of my arc lamp acts in a manner similar to condensing chambers provided in inclosedflaming carbon arc lamps, which are well known in the art.
  • the heated gases after passing throughthe arc, rise and pass into the condensing chamber 32 where they are cooled. As a result,'the gases condense and deposit their suspended particles upon the walls of the condensing chamber 32. After having been relieved of their suspended matter, the gases pass into the arc chamber 2 where they are again utilized to impart luminosity to the are.
  • Fig. 6 the shape of the condensing chamber 32 conforms to that of the arc chamber 2.
  • a draft tube 33 which is firmly attached, in any suitable manner, to the rod 7, surrounds the upper electrode 4.
  • the draft tube 33 occupies a fixed position relative to the electrode 4, irrespective of the position of the electrode. Its length is so regulated that, under all circumstances, communication is afforded between the arc chamber 2 and the condensing chamber 32 through the draft tube. I have found this means very effective in keeping the inner walls of the arc chamber 2 substantially free from deposits;
  • a reservoir 35 which freely communicates with the arc chamber 2 and is filled with porous material 36 such, for instance, as charcoal.
  • the porous material 36 absorbs the liquids or gases which may be contained in the glass container 1 and emits gas or vapor as the pressure within the lamp decreases and re-absorbs gas or vapor as the pressure within the lamp increases. In the latter instance, increases in pressure may be occasioned by the rise in temperature of the lamp and, consequently, the absorbent material 36 absorbs the excess gas or vapor, in this manner acting somewhat as a pressure regulator.
  • Fig. 8 an arc lamp provided with a condensing chamber 32 which is similar to the condensing chamber shown in the structure of Fig. 6. Communication between the arc chamber 2 and the condensing chamber 32 is afforded by means of the elongated passageway 32 in which is disposed a member 37 to guide the movement of the upper electrode 4.
  • the upper electrode 4 is secured to the lower end of a tubular member 38 in the upper end of which is disposed the magnetizable core member 8 of the electromagnet 9.
  • Electrical connection is made to the upper electrode 4 by means of a flexible lead 39 and a conductor 40 which is sealed in the tubular member 38, substantially as shown in the drawing.
  • each of the guide members 37 and 3'? is made in the form of a star having radially-extending arms 41 which are spaced from one another to provide alternatelydisposed openings 42 through which the arc gases may pass between the two chambers provided in the glass container 1.
  • Fig. 10 it may frequently be desired to supply a mixture of gases or vapors to the glass container 1 in order that color-modifying sub other materials suitable for the operation of the arc may be introduced thereto.
  • I may employ the structure shown in Fig. 10 in which two reservoirs 18 and 18 are provided, each being similar, in all respects, to the reservoir 18 of Fig. 1.
  • the various materials are disposed in these reservoirs and may be admitted into the bulbs 22 and 22 in any suitable manner.
  • the use of two or more such reservoirs may be desirable in cases where the volatilizable liqui'ds, which are utilized to charge the lamp, are of different specific gravities and, con, sequently, will not satisfactorily mix in their liquid state.
  • the reservoirs 22 and 22 may be filled with different materials and, after the same have volatilized to fill the glass container 1, the container may be sealed at E--F and G-H.
  • the condensing chamber 3 comprises a series of superposed chambers 43, 43 and 43 all being similarly formed and communicating with one another and with the arc chamber 2 by means of constricted openings 44.
  • the draft tube 33 which embraces the upper electrode 4 is so designed that, in operating condition, communication is afforded thereby between the arc chamber 2 and the upper condenser 43.
  • the heated gases or vapors evolved fromthe arc will flow upwardly through the draft tube 33 and into the condensing chamber 43 where they may expand and condense.
  • the cooled gases or vapors descend into the chamber 43*, and, as they pass through constricted opening 44, they are compressed, and, on passing into the chamber 43, are permitted to expand again.
  • the gases or vapors are repeatedly compressed and expanded, in each instance depositing further quantities of suspended material.
  • the gases are substantially free from all suspended material before they reenter the arc chamber 2 where they are subsequently introduced to the arc.
  • the condensing chambers 43, 43 and 43 are contained in a tubular casing 45 which affords protection for the super-structure of the glass container 1.
  • the draft tube 33 extends downwardly to embrace the upper portion of the lower electrode 4 so that, when the arc is drawn, it is surrounded by the draft tube throughout its entire length. This insures a strong draft to convey the evolved gases to the condensing chamber and also a steady arc.
  • the are chamber 2 is inclosed by a globe 46 which provides a dead air space 47 which, in turn, substantially surrounds the arc-instances may be added to the are, or that 66 closing globe 2.
  • a globe 46 which provides a dead air space 47 which, in turn, substantially surrounds the arc-instances may be added to the are, or that 66 closing globe 2.
  • chambers 43, 43 and 43 as cool as possible, 1 provide an imperforate member 48 which separates the lower portion of the lass container 1 from its upper portion. fipenings 49 are provided to secure circulation of air currents through the tubular member 45. As the air currents sweep past the condensers 43, 43 and 43", the latter are maintained cool and, consequently, are in an effective state to relieve the heated vapors and gases of their suspended material.
  • Terminals 50 and 51 are provided at the upper portion of the containing case 45, the former being connected to a clip terminal 52 which, in turn, is connected to the upper electrode 4, and the latter being connected, by means of an insulated conductor 53, to a clip terminal 54, which, in turn, is connected to the lower electrode 4
  • Fig. 12 is shown a modified form of lamp in which converging electrodes are employed.
  • the arc is contained in the inclosing globe 1 and extends between converging electrodes 55 and 56.
  • the electrode 56 is pivotally secured at 57 to a terminal member 58 and is engaged by a resilient member 59, which is attached to the terminal member 58 and to a rod 60 that supports the electrode 56.
  • a mechanism 61 is provided in order to initially draw the arc.
  • the mechanism 61 is rotated about a pivot 62 to occupy a horizontal position, as indicated by dotted lines 63.
  • the globe 1 occupies a position indicated by dotted lines 64.
  • the electrode 56 is withdrawn rom its cotiperating electrode 55, thereby initially establishing an arc.
  • the resilient member 59 limits the movement of the electrode 56 and thus insures an arc of constant length.
  • a blow magnet 65 is so disposed as to retain the arc in its proper operating position.
  • the electrode 56 is separated from its cotiperating electrode 55 by means of a magnetizable core member 66 which is influenced by an electromagnet 67.
  • the lamp is not energized, the electrodes 55 and 56 are maintained in closemechanical contact by reason of the resilient member 59.
  • the lamp is connected in circuit with the supply mains, thereby energizing the winding of the electromagnet 67.
  • the core member 66 is so actuated as to separate the electrodes 55 and 56 from each other. In this manner, the arc is initially established, and the regulating functions thereof are performed by the electromagnet 67.
  • An electric arc lamp comprising an inclosure containing materials which vaporize at the pressure obtaining within said inclosure the resulting vapors being capable of pro ucing light only when in the path of an electric discharge, coiiperating non-vaporizable electrodes disposed therein, and means for establishing an electric discharge between the electrodes, said vapors imparting the luminosity to the resulting arc and being capable of successive dissociation and recombination, whereby they ma be introduced repeatedly to the arc wit out undergoing substantial deterioration of their light-[giving properties.
  • electric arc lamp comprising a her metically-sealed envelop for the arc, substantially non-consumable and non-vaporizable electrodes disposed therein, means for establishing an electric discharge between said electrodes, and vapors that become light producing only when in the path of said discharge and contained in said envelop for continuous introduction to the established light producing are, said vapors being capable of successive dissociation and recombination, whereby they may repeatedly attain their initial light-producing properties after recurrently passing through the are.
  • An electric arm lamp comprising a confined body of vapors that become light-producing only when in the path of an electric discharge, and substantially non-consumable and non-vaporizable electrodes for establishing an electric discharge, said vapors being capable of successive dissociation and recombination whereby they may continuously impart a high intrinsic brilliancy to the said electrical discharge without undergoing substantial deterioration in their lightgiving properties.
  • An arc lamp comprising a sealed container providing an arc chamber and a superposed condensing chamber, a stationary electrode disposed in the arc chamber, a cooperating movable electrode extending therein, a draft tube surrounding said movable electrode and furnishing an annular opening exterior of said draft tube and between the arc and condensing chambers, and means for effecting separation of said electrodes.
  • An arc lamp comprising a globe providing an arc chamber and having a plurality of superposed condensing chambers, cooperating electrodes and a draft tube surrounding the upper electrode, said' draft tube furnishing direct communication therethrough between the arc chamber and the uppermost condensing chamber only.
  • An arc lamp comprising a container providing an arc chamber and a plurality of condensing chambers superposed upon said arc chamber and arranged in series relationship, an electrode, and a draft tube surrounding said electrode and furnishing direct communication therethrough between the arc chamber and the uppermost condensing chamber only.
  • An arc lamp comprising a container providing an arc chamber and a plurality of expanded portions superposed upon said are chamber and communicating with one another in series relationship through constricted openings, an electrode and a draft tube surrounding said electrode and furnishing direct communication therethrough between the arc chamber and the uppermost one only of said expanded portions.
  • An arc lamp comprising a container providing an arc chamber and a superposed condensing chamber, a pair of cooperating and alined electrodes, and a light transmitting draft tube embracing the upper electrode for furnishing direct com munication between the arc chamber and said condensing chamber, said draft tube serving to completely surround the are formed between said electrodes.
  • An electric arc lamp comprising a 1,844,767 I v g light-transmitting container constant-11 charge only becomes luminous toimpart a filled with vapors of a halid having hig hi h intrinsic brilliancy to the resulting arc.
  • luminous capacity, coiiperating and nonntestimony whereof, I have hereunto 10 vaporizable electrodes disposed therein, and subscribed my name this 28th day of May,

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
US33513A 1915-06-11 1915-06-11 Arc-lamp Expired - Lifetime US1344757A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US33513A US1344757A (en) 1915-06-11 1915-06-11 Arc-lamp
FR486167A FR486167A (fr) 1915-06-11 1916-06-09 Perfectionnements dans les lampes électriques à arc
GB835916A GB102221A (en) 1915-06-11 1916-06-13 Improvements in Electric Arc Lamps.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US33513A US1344757A (en) 1915-06-11 1915-06-11 Arc-lamp

Publications (1)

Publication Number Publication Date
US1344757A true US1344757A (en) 1920-06-29

Family

ID=21870829

Family Applications (1)

Application Number Title Priority Date Filing Date
US33513A Expired - Lifetime US1344757A (en) 1915-06-11 1915-06-11 Arc-lamp

Country Status (2)

Country Link
US (1) US1344757A (fr)
FR (1) FR486167A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153169A (en) * 1961-06-02 1964-10-13 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Discharge lamp
US3529209A (en) * 1967-06-12 1970-09-15 Engelhard Hanovia Inc Self-starting compact arc lamp
WO2007132368A2 (fr) * 2006-05-15 2007-11-22 Koninklijke Philips Electronics N.V. Lampe à décharge basse pression présentant une efficacité accrue

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153169A (en) * 1961-06-02 1964-10-13 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Discharge lamp
US3529209A (en) * 1967-06-12 1970-09-15 Engelhard Hanovia Inc Self-starting compact arc lamp
WO2007132368A2 (fr) * 2006-05-15 2007-11-22 Koninklijke Philips Electronics N.V. Lampe à décharge basse pression présentant une efficacité accrue
WO2007132368A3 (fr) * 2006-05-15 2008-01-24 Koninkl Philips Electronics Nv Lampe à décharge basse pression présentant une efficacité accrue
US20090206720A1 (en) * 2006-05-15 2009-08-20 Koninklijke Philips Electronics N.V. Low-pressure gas discharge lamp having improved efficiency

Also Published As

Publication number Publication date
FR486167A (fr) 1918-03-14

Similar Documents

Publication Publication Date Title
US2182732A (en) Metal vapor lamp
US1344757A (en) Arc-lamp
US1963963A (en) Discharge apparatus and method
US2275768A (en) Electric lamp
US2404002A (en) Electrical gaseous discharge lamp
US2042172A (en) Gaseous electric discharge device
US2042261A (en) Gaseous electric discharge device
US1088740A (en) Method of producing light.
US2118981A (en) Electric discharge tube
US2030715A (en) Gaseous electric discharge lamp device
US2030430A (en) Electric lamp
US2032945A (en) 115 volt ultra-violet lamp
US2245406A (en) Artificially cooled high-pressure mercury-vapor discharge tube
US682699A (en) Method of manufacturing vapor or gas lamps.
US2025565A (en) Incandescent lamp
US2065988A (en) Lamp
US1617633A (en) Electric-arc lamp
US1025932A (en) Means for producing light.
US2089325A (en) Discharge electric lamp
US2330850A (en) Flectrical gaseous discharge lamp
US690952A (en) Incandescent electrode vapor electric lamp.
US1648293A (en) Electric-discharge device
US1451271A (en) Vapor arc lamp
US1188194A (en) Gaseous-conductor lamp.
US2046096A (en) Electric light source