US3546533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency relay with rate-of-change of frequency compensation
Assignee: Westinghouse Electric Corp
•
Filing: 1968-11-20
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Granted: 1970-12-08
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Expires: 1988-11-20
Abstract
No abstract record available.
Inventors
- 👤 Henry W Lydick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:10
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2561357A
Cited
US3171966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |