Patent US1669145A successfully refreshed from Google Patents.
US1669145A
Expired / Lapsed
US
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Control electrode for space-current devices
Assignee: General Electric Co
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Filing: 1925-01-08
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Granted: 1928-05-08
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Expires: 1945-01-08
Abstract
No abstract record available.
Inventors
- 👤 Raymond B Prindle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:22
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/38; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0015; Y; Y10; Y10T; Y10T24/00; Y10T24/10
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) | 1931-05-08 | 1931-11-07 | 1932-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-05-08 | 1935-11-07 | 1936-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-05-08 | 1939-11-07 | 1940-05-08 | $7700.00 | Window Closed / Lapsed |