US3279377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control for variable speed multiple pump systems
Assignee: McGraw Edison Co
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Filing: 1964-10-22
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Granted: 1966-10-18
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Expires: 1984-10-22
Abstract
No abstract record available.
Inventors
- 👤 Elton J Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:39
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
CONTROL MEANS FOR A VARIABLE SPEED MOTOR DRIVEN MULTIPLE PUMP SYSTEM HAVING: (A) A PLURALITY OF PUMPS, (B) INDIVIDUAL MOTORS FOR EACH OF SAID PUMPS, (C) AN ELECTROMAGNETIC SLIP DRIVE DRIVEN BY EACH OF SAID MOTORS AND DRIVING THE CORRESPONDING PUMP, (D) A WET WELL INTO WHICH THE LIQUID TO BE PUMPED IS DIRECTED, (E) THE INLET TO EACH PUMP BEING CONNECTED TO SAID WELL, (F) SENSING MEANS SUBJECT TO THE HEIGHT OF THE LIQUID IN SAID WET WELL AND HAVING A MOVING PART ADAPTED TO MOVE ON CHANGES IN THE ELEVATION OF THE LIQUID IN THE WET WELL, (G) A LINKAGE OPERATED BY SAID SENSING MEANS, (H) A TRANSDUCER HAVING A MOVABLE PART CONNECTED TO SAID LINKAGE, (I) SAID TRANSDUCER PROVIDING A VARIABLE SIGNAL VOLTAGE CORRESPONDING WITH THE ELEVATION OF THE LIQUID IN SAID WET WELL, AND (J) MEANS OPERATED BY THE VOLTAGE OF SAID TRANSDUCER FOR ENERGIZING SAID SLIP DRIVER; (K) THE COMBINATION OF MEANS FOR VARING THE RATE OF CHANGE OF THE VOLTAGE OPERATING EACH SLIP DRIVE.
Claim 2
Dependent Claim
170 words
CONTROL MEANS FOR A VARIABLE SPEED MOTOR DRIVEN MULTIPLE PUMP SYSTEM HAVING: (A) A PLURALITY OF PUMPS, (B) INDIVIDUAL MOTORS FOR EACH OF SAID PUMPS, (C) AN ELECTROMAGNETIC SLIP DRIVE DRIVEN BY EACH OF SAID MOTORS AND DRIVING THE CORRESPONDING PUMP, (D) A WET WELL INTO WHICH THE LIQUID TO BE PUMPED IS DIRECTED, (E) THE INLET TO EACH PUMP BEING CONNECTED TO SAID WELL, (F) SENSING MEANS SUBJECT TO THE HEIGHT OF THE LIQUID IN SAID WET WELL AND HAVING A MOVING PART ADAPTED TO MOVE ON CHANGES IN THE ELEVATION OF THE LIQUID IN THE WET WELL, (G) A LINKAGE OPERATED BY SAID SENSING MEANS, (H) A TRANSDUCER HAVING A MOVABLE PART CONNECTED TO SAID LINKAGE, (I) SAID TRANSDUCER PROVIDING A VARIABLE SIGNAL VOLTAGE CORRESPONDING WITH THE ELEVATION OF THE LIQUID IN SAID WET WELL, AND (J) MEANS OPERATED BY THE VOLTAGE OF SAID TRANSDUCER FOR ENERGIZING SAID SLIP DRIVER; (K) THE COMBINATION OF MEANS FOR VARING THE RATE OF CHANGE OF THE VOLTAGE OPERATING EACH SLIP DRIVE.
References Cited (Backward Citations)
US2733660A
Cited
US1987466A
Cited
US2727202A
Cited
US3021789A
Cited
US3024730A
Cited
US3043226A
Cited
US3193183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |