US3248628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for coordinated starting and stopping electric motors
Assignee: Emerson Electric Co
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Filing: 1961-12-11
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Granted: 1966-04-26
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Expires: 1981-12-11
Abstract
No abstract record available.
Inventors
- 👤 William E Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:38
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN A SYSTEM FOR COORDINATED OPERATION OF SUBSTANTIALLY SYNCHRONOUS ELECTRICAL MOTORS: A SOURCE OF ALTERNATING CURRENT; A FIRST LOAD OPERATING MOTOR CONNECTED TO SAID SOURCE; AN ELECTRICAL DIFFERENTIAL HAVING AN INPUT SIDE CONNECTED TO SAID SOURCE, AN OUTPUT SIDE, AND A SUBSTANTIALLY SYNCHRONOUS DRIVING MOTOR OPERATING SAID DIFFERENTIAL; SAID DIFFERENTIAL OUTPUT HAVING A FREQUENCY CORRESPONDING TO THAT OF THE SOURCE WHEN THE DRIVING MOTOR IS AT REST; MEANS FOR OPTIONALLY CONNECTING SAID DRIVING MOTOR TO SAID SOURCE; A PLURALITY OF LOAD OPERATING MOTORS SUPPLIED WITH ELECTRICAL ENERGY FROM THE DIFFERENTIAL OUTPUT; AND MEANS FOR ATTAINING POSITION SYNCHRONIZATION BETWEEN THE FIRST MOTOR CONNECTED TO THE SOURCE AND ONE OF THE SAID PLURALITY OF MOTORS THAT ARE SUPPLIED WITH ENERGY FROM THE DIFFERENTIAL, INCLUDING A CORRECTION MOTOR FOR DRIVING THE DIFFERENTIAL AND OPTIONALLY COUPLED TO THE DIFFERENTIAL.
Claim 2
Dependent Claim
135 words
IN A SYSTEM FOR COORDINATED OPERATION OF SUBSTANTIALLY SYNCHRONOUS ELECTRICAL MOTORS: A SOURCE OF ALTERNATING CURRENT; A FIRST LOAD OPERATING MOTOR CONNECTED TO SAID SOURCE; AN ELECTRICAL DIFFERENTIAL HAVING AN INPUT SIDE CONNECTED TO SAID SOURCE, AN OUTPUT SIDE, AND A SUBSTANTIALLY SYNCHRONOUS DRIVING MOTOR OPERATING SAID DIFFERENTIAL; SAID DIFFERENTIAL OUTPUT HAVING A FREQUENCY CORRESPONDING TO THAT OF THE SOURCE WHEN THE DRIVING MOTOR IS AT REST; MEANS FOR OPTIONALLY CONNECTING SAID DRIVING MOTOR TO SAID SOURCE; A PLURALITY OF LOAD OPERATING MOTORS SUPPLIED WITH ELECTRICAL ENERGY FROM THE DIFFERENTIAL OUTPUT; AND MEANS FOR ATTAINING POSITION SYNCHRONIZATION BETWEEN THE FIRST MOTOR CONNECTED TO THE SOURCE AND ONE OF THE SAID PLURALITY OF MOTORS THAT ARE SUPPLIED WITH ENERGY FROM THE DIFFERENTIAL, INCLUDING A CORRECTION MOTOR FOR DRIVING THE DIFFERENTIAL AND OPTIONALLY COUPLED TO THE DIFFERENTIAL.
References Cited (Backward Citations)
US755824A
Cited
CH95136A
Cited
GB262085A
Cited
US2394480A
Cited
US2782349A
Cited
GB753195A
Cited
US2895096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |