Patent US3170772A successfully refreshed from Google Patents.
US3170772A
Expired / Lapsed
US
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Oxide coated cathodes for electron tubes
Assignee: Toshiba Corp
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Filing: 1961-01-05
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Granted: 1965-02-23
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Expires: 1981-01-05
Abstract
No abstract record available.
Inventors
- 👤 Sato Reiji
- 👤 Ohtsuki Taro
- 👤 Suzuki Akira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:37
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/26; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1197615A
Cited
US2543439A
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US2447038A
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US2557372A
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US2912611A
Cited
US2878410A
Cited
US2996795A
Cited
US2965793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |