US2773181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency discriminator system
Assignee: Westinghouse Electric Corp
•
Filing: 1951-10-25
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Granted: 1956-12-04
•
Expires: 1971-10-25
Abstract
No abstract record available.
Inventors
- 👤 John B Singel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:14
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/442; H04Q1/4423
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB172024A
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US1606807A
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US1703171A
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US1697512A
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US2097937A
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US2422083A
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US2569000A
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US2589236A
Cited
US2561088A
Cited
US2461956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |