US2495908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic discharge device
Assignee: GTE Sylvania Inc
•
Filing: 1948-07-16
•
Granted: 1950-01-31
•
Expires: 1968-07-16
Abstract
No abstract record available.
Inventors
- 👤 Gerald C Rich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:32
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/50; H01J17/52; H01J17/54; H01J17/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2082638A
Cited
US1962159A
Cited
US2055487A
Cited
US2072370A
Cited
US1989461A
Cited
US1989462A
Cited
US2107520A
Cited
US2228277A
Cited
US2293177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-30 | 1953-08-01 | 1954-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-30 | 1957-08-01 | 1958-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-30 | 1961-08-01 | 1962-01-31 | $7700.00 | Window Closed / Lapsed |