Patent US3705990A successfully refreshed from Google Patents.
US3705990A
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US
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Thyristor firing control circuit
Assignee: Honeywell Inc
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Filing: 1971-07-21
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Granted: 1972-12-12
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Expires: 1991-07-21
Abstract
Abstract A BURST FIRING TYPE OF SOLID STATE MODULATING CONDITION CONTROL SYSTEM OPERATING A SOLID SLATE POWER HANDLING SEMICODUCTOR MEANS. A PROGRAMMABLE UNIJUCTION TRANSISTOR US UTILIZED TO PROVIDE A MODIFIED ZERO CROSSCOVER FIRING CURCUIT WITH AN EXTENDED TRIGGERING PULSE TO THE TRIAC WHEN USING INDUCTIVE LOADS OR IN THREE PHASE CONTROL CIRCUITS WHERE CONTROL CIRCUIT VOLTAGE AND LOAD CIRCUIT CURRENT ARE NOT IN PHASE.
Inventors
- 👤 John Pileckis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:56
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/083
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |