US2686274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathode
Assignee: General Electric Co
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Filing: 1950-05-11
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Granted: 1954-08-10
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Expires: 1970-05-11
Abstract
No abstract record available.
Inventors
- 👤 Rooksby Harold Percy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:36
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0675; H01J61/0677
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A GASEOUS ELECTRIC DISCHARGE LAMP COMPRISING A SEALED ENVELOPE CONTAINING A GASEOUS IONIZABLE ATMOSPHERE AND COOPERATING ELECTRODES AT LEAST ONE OF WHICH IS AN ELECTRON-EMISSIVE CATHODE COMPRISING A REFRACTORY METAL BASE AND A QUANTITY OF ACTIVATING BARIUM ORTHOTITANATE SUPPORTED BY SAID BASE.
Claim 2
Dependent Claim
42 words
A GASEOUS ELECTRIC DISCHARGE LAMP COMPRISING A SEALED ENVELOPE CONTAINING A GASEOUS IONIZABLE ATMOSPHERE AND COOPERATING ELECTRODES AT LEAST ONE OF WHICH IS AN ELECTRON-EMISSIVE CATHODE COMPRISING A REFRACTORY METAL BASE AND A QUANTITY OF ACTIVATING BARIUM ORTHOTITANATE SUPPORTED BY SAID BASE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |