US3331989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage comparator circuits
Assignee: Westinghouse Electric Corp
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Filing: 1963-08-12
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Granted: 1967-07-18
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Expires: 1983-08-12
Abstract
No abstract record available.
Inventors
- 👤 Warren J Schmidt
- 👤 John C Gambale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:09
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/40; H02H3/405; H02H3/26; H02H3/32; H02H3/34; H02H3/353
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A VOLTAGE COMPARATOR ADAPTED TO ACTUATE AN ELECTRICAL UTILIZATION DEVICE WHEN THE MAGNITUDE OF ONE OF TWO ALTERNATING CURRENT VOLTAGES HAS A PREDETERMINED RELATIONSHIP WITH RESPECT TO THAT OF THE OTHER, COMPRISING RECTIFIERS FOR RECTIFYING BOTH OF SAID VOLTAGES, MEANS FOR FILTERING THE FIRST OF SAID VOLTAGES, SAID FILTERING MEANS COMPRISING A CAPACITOR CONNECTED TO AT LEAST ONE OF SAID RECTIFIERS, SWITCH DEVICES CONNECTED IN SHUNT WITH SAID CAPACITOR, SAID SWITCH DECIVES BEING NORMALLY NON-CONDUCTIVE, MEANS FOR RENDERING THE FIRST OF SAID SWITCH DEVICES CONDUCTIVE FOR AN INTERVAL DURING THE POSITIVE HALF CYCLE OF SAID FIRST VOLTAGE WHEN THE VOLTAGE ACROSS SAID CAPACITOR EXCEEDS FOR MAGNITUDE OF SAID POSITIVE HALF CYCLE, MEANS FOR RENDERING THE SECOND OF SAID SWITCH DEVICES CONDUCTIVE FOR AN INTERVAL DURING THE NEGATIVE HALF CYCLE OF SAID FIRST ALTERNATING CURRENT VOLTAGE WHEN
Claim 2
Dependent Claim
136 words
A VOLTAGE COMPARATOR ADAPTED TO ACTUATE AN ELECTRICAL UTILIZATION DEVICE WHEN THE MAGNITUDE OF ONE OF TWO ALTERNATING CURRENT VOLTAGES HAS A PREDETERMINED RELATIONSHIP WITH RESPECT TO THAT OF THE OTHER, COMPRISING RECTIFIERS FOR RECTIFYING BOTH OF SAID VOLTAGES, MEANS FOR FILTERING THE FIRST OF SAID VOLTAGES, SAID FILTERING MEANS COMPRISING A CAPACITOR CONNECTED TO AT LEAST ONE OF SAID RECTIFIERS, SWITCH DEVICES CONNECTED IN SHUNT WITH SAID CAPACITOR, SAID SWITCH DECIVES BEING NORMALLY NON-CONDUCTIVE, MEANS FOR RENDERING THE FIRST OF SAID SWITCH DEVICES CONDUCTIVE FOR AN INTERVAL DURING THE POSITIVE HALF CYCLE OF SAID FIRST VOLTAGE WHEN THE VOLTAGE ACROSS SAID CAPACITOR EXCEEDS FOR MAGNITUDE OF SAID POSITIVE HALF CYCLE, MEANS FOR RENDERING THE SECOND OF SAID SWITCH DEVICES CONDUCTIVE FOR AN INTERVAL DURING THE NEGATIVE HALF CYCLE OF SAID FIRST ALTERNATING CURRENT VOLTAGE WHEN
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |