Patent US2883576A successfully refreshed from Google Patents.
US2883576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic valves
Assignee: General Electric Co
•
Filing: 1955-04-04
•
Granted: 1959-04-21
•
Expires: 1975-04-04
Abstract
No abstract record available.
Inventors
- 👤 Harries John Henry Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:16
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J21/00; H01J21/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB115700A
Cited
US1941687A
Cited
US1904436A
Cited
US1961192A
Cited
US2068287A
Cited
US2254095A
Cited
US2099531A
Cited
US2197753A
Cited
US2512858A
Cited
US2462921A
Cited
US2618690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |