Patent US2724070A successfully refreshed from Google Patents.
US2724070A
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US
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Cathode coating for electrical discharge devices and method for making the same
Assignee: Westinghouse Electric Corp
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Filing: 1953-02-09
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Granted: 1955-11-15
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Expires: 1973-02-09
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Heine
- 👤 Meister George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:32
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
44 words
AN INDIRECT HEATED TYPE CATHODE COMPRISING A BASE PORTION OF NICKEL AND A FUSED COATING THEREON AND ADHERING THERETO, SAID COATING COMPRISING BARIUM OXIDE AND MAGNESIUM OXIDE, SAID BARIUM OXIDE BEING NOT LESS THAN 81.5% NOR MORE THAN 98.5% BY WEIGHT OF SAID COATING.
References Cited (Backward Citations)
US1830825A
Cited
US2018993A
Cited
GB624009A
Cited
US2476590A
Cited
US2530394A
Cited
US2542352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-14 | 1959-05-16 | 1959-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-14 | 1963-05-16 | 1963-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-14 | 1967-05-16 | 1967-11-15 | $7700.00 | Window Closed / Lapsed |