US2638549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for neutralization of frequency divider chains
Assignee: United States Department of the Navy
•
Filing: 1945-12-28
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Granted: 1953-05-12
•
Expires: 1965-12-28
Abstract
No abstract record available.
Inventors
- 👤 Roger B Woodbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:40
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/10; H03K4/12; H03K4/16; H03B; H03B19/00; H03B19/06; H03B19/08; H03B19/12; H04; H04N; H04N5/00; H04N5/04; H04N5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2093882A
Cited
US2113011A
Cited
US2493517A
Cited
US2390608A
Cited
US2444890A
Cited
US2411573A
Cited
US2415567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |