Patent US2693546A successfully refreshed from Google Patents.
US2693546A
Expired / Lapsed
US
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Electron emitter for electron tubes
Assignee: Varian Medical Systems Inc
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Filing: 1948-07-10
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Granted: 1954-11-02
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Expires: 1968-07-10
Abstract
No abstract record available.
Inventors
- 👤 Harold E Sorg
- 👤 Paul D Williams
- 👤 Donald F Drieschman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:50
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1155426A
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US1529597A
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US2269081A
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US2297454A
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US2399005A
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US2397533A
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US2392397A
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US2450770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-01 | 1958-05-03 | 1958-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-01 | 1962-05-03 | 1962-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-01 | 1966-05-03 | 1966-11-02 | $7700.00 | Window Closed / Lapsed |