US3205420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural motor load responsive sequential starting circuit
Assignee: MESSRS BLACKSTONE AND CO Ltd
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Filing: 1961-06-06
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Granted: 1965-09-07
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Expires: 1981-06-06
Abstract
No abstract record available.
Inventors
- 👤 Gordon E Cobb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:38
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/54; H02P1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A CONTROL SYSTEM FOR STARTING AND OPERATING ELECTRIC MOTORS IN PARALLEL COMPRISING A SET OF BUS BARS, A PLURALITY OF ELECTRIC GENERATORS CONNECTABLE SEQUENTIALLY TO POWER SAID BUS BARS, A PLURALITY OF MOTORS, A STARTER ASSOCIATED WITH EACH MOTOR FOR CONNECTING SAID MOTORS ACROSS SAID BUS BARS, A MAGNETIC AMPLIFIER FORMING A CURRENT LEVEL DETECTOR BIASED IN ONE DIRECTION BY A CURRENT PROPORTIONAL TO THE LOAD ON THE BUS BARS AND IN THE OTHER DIRECTION BY A CURRENT PROPORTIONAL TO THE TOTAL GENERATING CAPACITY OF THE GENERATORS DELIVERING TO THE BUS BARS, AND A CONTROL LINE FROM THE MAGNETIC AMPLIFIER TO THE STARTERS THROUGH WHICH CURRENT TO OPERATE THE STARTERS IS SUPPLIED, THE SUPPLY TO SAID CONTROL LINE BEING CUT OFF WHEN THE CURRENT THROUGH THE MAGNETIC AMPLIFIER DUE TO THE LOAD ON THE BUS BARS EXCEEDS THAT WHICH IS PROPORTIONAL TO THE GENERATING CAPACITY.
Claim 2
Dependent Claim
145 words
A CONTROL SYSTEM FOR STARTING AND OPERATING ELECTRIC MOTORS IN PARALLEL COMPRISING A SET OF BUS BARS, A PLURALITY OF ELECTRIC GENERATORS CONNECTABLE SEQUENTIALLY TO POWER SAID BUS BARS, A PLURALITY OF MOTORS, A STARTER ASSOCIATED WITH EACH MOTOR FOR CONNECTING SAID MOTORS ACROSS SAID BUS BARS, A MAGNETIC AMPLIFIER FORMING A CURRENT LEVEL DETECTOR BIASED IN ONE DIRECTION BY A CURRENT PROPORTIONAL TO THE LOAD ON THE BUS BARS AND IN THE OTHER DIRECTION BY A CURRENT PROPORTIONAL TO THE TOTAL GENERATING CAPACITY OF THE GENERATORS DELIVERING TO THE BUS BARS, AND A CONTROL LINE FROM THE MAGNETIC AMPLIFIER TO THE STARTERS THROUGH WHICH CURRENT TO OPERATE THE STARTERS IS SUPPLIED, THE SUPPLY TO SAID CONTROL LINE BEING CUT OFF WHEN THE CURRENT THROUGH THE MAGNETIC AMPLIFIER DUE TO THE LOAD ON THE BUS BARS EXCEEDS THAT WHICH IS PROPORTIONAL TO THE GENERATING CAPACITY.
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) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |