GB458603A - Improvements in luminous electric discharge lamps - Google Patents
Improvements in luminous electric discharge lampsInfo
- Publication number
- GB458603A GB458603A GB20775/35A GB2077535A GB458603A GB 458603 A GB458603 A GB 458603A GB 20775/35 A GB20775/35 A GB 20775/35A GB 2077535 A GB2077535 A GB 2077535A GB 458603 A GB458603 A GB 458603A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- glass
- envelope
- boric acid
- electric discharge
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
- H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
- H01J61/20—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent mercury vapour
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
- Ceramic Products (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
458,603. Glass m a n u f a c t u r e. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London.-(Patent Treuhand- Ges. f³r Elektrische Gl³hlampen; 11, Ehrenbergstrasse, Berlin) July 22, 1935, No. 20775. Addition to 432,614. [Class 56] [See also Group XL] To reduce blackening of the envelope of a high-pressure lamp, at least 0À2 per cent of caesium is added to the mercury filling and the envelope contains 10-20 per cent of boric acid, 25-35 per cent of alumina, 20-40 per cent of alkaline earths and 26-4 per cent of silica, the boric acid and silica together not exceeding 50 per cent. The alkaline earths may be calcium and barium oxides and may be partly replaced by magnesium and zinc oxides. A composition of SiO2, B2O3, Al2O3, CaO and BaO in the percentages of 35, 10, 30, 15 and 10 respectively is specified. The glass may form the inner envelope of the lamp or a flashing on the inside of a less resistant glass. Specification 426,129 is referred to.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP71541D DE637269C (en) | 1935-07-13 | 1935-07-13 | High-pressure mercury lamp with inert gas base filling and glow electrodes |
| GB20775/35A GB458603A (en) | 1935-07-13 | 1935-07-22 | Improvements in luminous electric discharge lamps |
| US87770A US2135662A (en) | 1935-07-13 | 1936-06-27 | Electric gaseous discharge device |
| FR47495D FR47495E (en) | 1935-07-13 | 1936-06-30 | High pressure mercury lamp |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP71541D DE637269C (en) | 1935-07-13 | 1935-07-13 | High-pressure mercury lamp with inert gas base filling and glow electrodes |
| GB20775/35A GB458603A (en) | 1935-07-13 | 1935-07-22 | Improvements in luminous electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB458603A true GB458603A (en) | 1936-12-23 |
Family
ID=25990961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20775/35A Expired GB458603A (en) | 1935-07-13 | 1935-07-22 | Improvements in luminous electric discharge lamps |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2135662A (en) |
| DE (1) | DE637269C (en) |
| FR (1) | FR47495E (en) |
| GB (1) | GB458603A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3219869A (en) * | 1963-07-01 | 1965-11-23 | Gen Electric | Cesium vapor discharge lamp |
| US20080170384A1 (en) * | 2007-01-11 | 2008-07-17 | Zhu Jing Jim | Lamp |
-
1935
- 1935-07-13 DE DEP71541D patent/DE637269C/en not_active Expired
- 1935-07-22 GB GB20775/35A patent/GB458603A/en not_active Expired
-
1936
- 1936-06-27 US US87770A patent/US2135662A/en not_active Expired - Lifetime
- 1936-06-30 FR FR47495D patent/FR47495E/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE637269C (en) | 1936-10-24 |
| FR47495E (en) | 1937-05-25 |
| US2135662A (en) | 1938-11-08 |
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