Patent US1881645A successfully refreshed from Google Patents.
US1881645A
Expired / Lapsed
US
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Activation and reactivation of electron emission tubes
Assignee: Technidyne Corp
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Filing: 1929-10-29
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Granted: 1932-10-11
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Expires: 1949-10-29
Abstract
No abstract record available.
Inventors
- 👤 Lester L Jones
- 👤 Joseph A Flanzer
- 👤 Reisman Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:03
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/50; H01J9/505; H01J9/02; H01J9/04; H01J9/042; H01J9/045; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-10-11 | 1936-04-11 | 1936-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-10-11 | 1940-04-11 | 1940-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-10-11 | 1944-04-11 | 1944-10-11 | $7700.00 | Window Closed / Lapsed |