US3544874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibit trigger circuit to prevent simultaneous conduction of controlled rectifiers due to improperly spaced command signals
Assignee: Singer Co
•
Filing: 1969-01-21
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Granted: 1970-12-01
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Expires: 1989-01-21
Abstract
No abstract record available.
Inventors
- 👤 John J Dutko
- 👤 Henry A Seesselberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:25
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/12; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; H03K17/725
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3222582A
Cited
US3188547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |