US3243632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic arc discharge cathode glow lamp
Assignee: General Electric Co
•
Filing: 1962-02-15
•
Granted: 1966-03-29
•
Expires: 1982-02-15
Abstract
No abstract record available.
Inventors
- 👤 John E White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:55
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/64; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0675; H01J61/0677
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A THERMIONIC ARC ELECTRIC DISCHARGE LAMP OF THE CATHODIC GLOW TYPE HAVING AN OPERATING VOLTAGE NOT MUCH HIGHER THAN ITS MINIMUM IONIZATION VOLTAGE COMPRISING AN ENVELOPE FILLED WITH AN IONIZABLE MEDIUM AND HAVING SEALED THEREIN AN ANODE, A MAIN THERMIONIC FILAMENTARY CATHODE ACTIVATED TO HAVE A RELATIVELY LOW WORK FUNCTION FOR SUPPORTING THE MAJOR PART OF THE ELECTRON DISCHARGE CURRENT, AN AUXILIARY THERMIONIC FILAMENTARY CATHODE OF RELATIVELY HIGH WORK FUNCTION NON- ACTIVATED METAL, AND INLEAD CONNECTIONS FOR SUPPLYING CURRENT TO BOTH CATHODES TO HEAT THEM TO EFFECTIVE ELECTRON-EMITTING TEMPERATURE AND FOR APPLYING A POTENTIAL TO THE ANODE RELATIVE TO THE CATHODES, SAID CONNECTIONS PLACING ONE END OF SAID AUXILIARY CATHODE AT THE MOST NEGATIVE POTENTIAL IN SAID LAMP IN ORDER TO PROVIDE A SMALL PROPORTION OF RELATIVELY HIGH SPEED ELECTRONS FOR REDUCING THE IGNITION VOLTAGE.
Claim 2
Dependent Claim
135 words
A THERMIONIC ARC ELECTRIC DISCHARGE LAMP OF THE CATHODIC GLOW TYPE HAVING AN OPERATING VOLTAGE NOT MUCH HIGHER THAN ITS MINIMUM IONIZATION VOLTAGE COMPRISING AN ENVELOPE FILLED WITH AN IONIZABLE MEDIUM AND HAVING SEALED THEREIN AN ANODE, A MAIN THERMIONIC FILAMENTARY CATHODE ACTIVATED TO HAVE A RELATIVELY LOW WORK FUNCTION FOR SUPPORTING THE MAJOR PART OF THE ELECTRON DISCHARGE CURRENT, AN AUXILIARY THERMIONIC FILAMENTARY CATHODE OF RELATIVELY HIGH WORK FUNCTION NON- ACTIVATED METAL, AND INLEAD CONNECTIONS FOR SUPPLYING CURRENT TO BOTH CATHODES TO HEAT THEM TO EFFECTIVE ELECTRON-EMITTING TEMPERATURE AND FOR APPLYING A POTENTIAL TO THE ANODE RELATIVE TO THE CATHODES, SAID CONNECTIONS PLACING ONE END OF SAID AUXILIARY CATHODE AT THE MOST NEGATIVE POTENTIAL IN SAID LAMP IN ORDER TO PROVIDE A SMALL PROPORTION OF RELATIVELY HIGH SPEED ELECTRONS FOR REDUCING THE IGNITION VOLTAGE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |