US3549906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit responsive to positive or negative transient signal or to power supply voltage decrease to fire scr
Assignee: Westinghouse Electric Corp
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Filing: 1967-11-30
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Granted: 1970-12-22
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Expires: 1987-11-30
Abstract
No abstract record available.
Inventors
- 👤 Melbourne J Hellstrom
- 👤 Michael H Oppenheimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:40
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/57; H02; H02M; H02M1/00; H02M1/08; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |