US2504293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency control
Assignee: RCA Corp
•
Filing: 1945-01-25
•
Granted: 1950-04-18
•
Expires: 1965-01-25
Abstract
No abstract record available.
Inventors
- 👤 Joseph G Beard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:25
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/46; H05B6/48; H05B6/50; H03; H03J; H03J7/00; H03J7/02; H03J7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1889083A
Cited
US2105096A
Cited
US2112504A
Cited
US2173902A
Cited
US2116435A
Cited
US2156534A
Cited
US2284266A
Cited
US2308620A
Cited
US2410817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |