GB535535A - Improvements in or relating to telephone ringing systems - Google Patents
Improvements in or relating to telephone ringing systemsInfo
- Publication number
- GB535535A GB535535A GB6354/40A GB635440A GB535535A GB 535535 A GB535535 A GB 535535A GB 6354/40 A GB6354/40 A GB 6354/40A GB 635440 A GB635440 A GB 635440A GB 535535 A GB535535 A GB 535535A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- winding
- april
- electrodes
- relating
- 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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/52—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of gas-filled tubes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
- H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Devices For Supply Of Signal Current (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
535,535. Valve relay circuits. ELECTRICAL RESEARCH PRODUCTS, Inc. April 9, 1940, No. 6354. Convention date, April 18, 1939. [Class 40 (v)] [Also in Group XXXIX] A cold-cathode gas-discharge tube 4 is associated with a two-winding direct-current relay 3 in the manner shown to make it responsive to alternating ringing current, e.g. of 20 cycles. During one-half cycle, the battery 10 aids the discharge across electrodes 5, 6 and the upper winding of the relay is operative. During the next half-cycle, the tube remains ionized and sufficient current flows across electrodes 5, 7 to the lower winding to hold the relay.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US535535XA | 1939-04-18 | 1939-04-18 | |
| US268538A US2222248A (en) | 1939-04-18 | 1939-04-18 | Ringing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB535535A true GB535535A (en) | 1941-04-11 |
Family
ID=26731990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6354/40A Expired GB535535A (en) | 1939-04-18 | 1940-04-09 | Improvements in or relating to telephone ringing systems |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2222248A (en) |
| GB (1) | GB535535A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE477477A (en) * | 1944-01-07 |
-
1939
- 1939-04-18 US US268538A patent/US2222248A/en not_active Expired - Lifetime
-
1940
- 1940-04-09 GB GB6354/40A patent/GB535535A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2222248A (en) | 1940-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB571483A (en) | Improved system for registering a train of positive and negative half cycles of an alternating current | |
| GB556511A (en) | Improvements in and relating to time delay electric relays | |
| GB535535A (en) | Improvements in or relating to telephone ringing systems | |
| US2108219A (en) | Gas tube circuits | |
| GB426396A (en) | Means for controlling the voltage generated by an alternating current oscillator | |
| GB216562A (en) | Improvements in and relating to electrical discharge apparatus | |
| GB482725A (en) | Improvements in or relating to generators of relaxation oscillations | |
| GB535991A (en) | Improvements in or relating to telephone systems | |
| GB542853A (en) | Improvements in circuit arrangements for operating electric discharge lamps | |
| GB528181A (en) | Improvements in and relating to electric discharge devices | |
| GB515695A (en) | Improvements in or relating to electrical signalling systems | |
| GB380247A (en) | Improvements in apparatus for the treatment of organisms with electric current | |
| GB408175A (en) | Improvements in and relating to alternating current switches incorporating arc quenching means operating by compressed gas or vapour blasts | |
| GB525850A (en) | Improvements in and relating to electrical immersion heaters | |
| GB667353A (en) | Improvements relating to electric motors and generators | |
| GB414278A (en) | Improvements in and relating to light flashing apparatus using electric discharge lamps | |
| JPS53140907A (en) | Current supplying circuit | |
| GB551487A (en) | Improvements in circuit arrangements for operating electric discharge lamps | |
| JPS5257703A (en) | Power suspension display circuit | |
| GB528812A (en) | Improvements in mercury arc converters | |
| GB673410A (en) | Improvements relating to electrical discharge systems | |
| GB656807A (en) | Device for igniting mercury arc rectifiers | |
| GB316940A (en) | Improvements in and relating to light-sensitive apparatus | |
| GB474197A (en) | Improvements in or relating to devices for rectifying by means of interrupters actuated synchronously with the alternating current supply mains | |
| GB519348A (en) | Improvements in or relating to metal vapour rectifiers |