US3512013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency sensing circuit
Assignee: Westinghouse Electric Corp
•
Filing: 1966-09-09
•
Granted: 1970-05-12
•
Expires: 1986-09-09
Abstract
No abstract record available.
Inventors
- 👤 Wendell Calfee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:04
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/46; G; G01; G01R; G01R23/00; G01R23/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2122464A
Cited
US2405843A
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US2489824A
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US2789217A
Cited
US2867767A
Cited
US2924712A
Cited
US3093756A
Cited
US3277311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |