US1691446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron-discharge device with oxide-coated filament
Assignee: Westinghouse Lamp Co
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Filing: 1925-03-28
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Granted: 1928-11-13
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Expires: 1945-03-28
Abstract
No abstract record available.
Inventors
- 👤 Rentschler Harvey Clayton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:02
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958
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) | 1931-11-13 | 1932-05-14 | 1932-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-11-13 | 1936-05-14 | 1936-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-11-13 | 1940-05-14 | 1940-11-13 | $7700.00 | Window Closed / Lapsed |