US2701848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathode for discharge devices
Assignee: General Electric Co
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Filing: 1952-09-16
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Granted: 1955-02-08
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Expires: 1972-09-16
Abstract
No abstract record available.
Inventors
- 👤 Miles Edward Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:43
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0675; H01J61/0677; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
A FLUORESCENT LAMP COMPRISING A SEALED LIGHT-TRANSMITTING ENVELOPE HAVING A COATING OF FLUORESCENT MATERIAL ON THE INNER WALL THEREOF, A QUANTITY OF MERCURY AND A FILLING OF INERT GAS IN SAID ENVELOPE, FILAMENTARY ELECTRODES IN SAID ENVELOPE, AND A COATING ON SAID ELECTRODES COMPRISING ESSENTIALLY AT LEAST ONE OXIDE OF AN ALKALINE EARTH METAL AND A MINOR PROPORTION OF ALKALINE EARTH METAL GERMANATE CONTAINING A WEIGHT OF GERMANIUM IN THE RANGE OF ABOUT 2.5% TO 20% OF THE WEIGHT OF THE ALKALINE EARTH METAL OXIDE.
References Cited (Backward Citations)
US2249672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-07 | 1958-08-09 | 1959-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-07 | 1962-08-09 | 1963-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-07 | 1966-08-09 | 1967-02-08 | $7700.00 | Window Closed / Lapsed |