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Patent US3274940A successfully refreshed from Google Patents.
US3274940A
Expired / Lapsed
US
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Control system for well pump
Assignee: Individual
•
Filing: 1965-01-12
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Granted: 1966-09-27
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Expires: 1985-01-12
Abstract
No abstract record available.
Inventors
- 👤 Robert A Cottrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:00
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
AN OIL WELL PUMPING SYSTEM HAVING (A) A PUMP IN THE WALL, (B) A MOTOR DRIVINGLY CONNECTED TO THE PUMP, (C) A DISCHARGE LINE CONNECTED TO THE PUMP IN THE WELL, (D) A HYDRAULIC PRESSURE CONTROL MEANS FOR MAINTAINING THE HYDRAULIC PRESSURE ON THE PUMP AT A GREATER AMOUNT THAN THE PRESSURE IN THE DISCHARGE LINE DOWNSTREAM THE PRESSURE CONTROL VALVE MEANS WHEN THE PUMP IS PUMPING LIQUID, (E) A BYPASS FLUID PASSAGEWAY OPEN AT ALL TIMES CONNECTING THE DISCHARGE LINE ABOVE STREAM AND DOWNSTREAM OF THE PRESSURE CONTROL VALVE MEANS, (F) THE BYPASS FLUID PASSAGEWAY BEING SMALL AS COMPARED TO THE OPENING THROUGH THE PRESSURE CONTROL VALVE MEANS, (G) SENSING MEANS ATTACHED TO THE SYSTEM FOR DETERMINING IF LIQUID DISPLACEMENT FROM THE PUMP IS GREATER THAN CAN BE ACCOMMODATED BY THE BYPASS FLUID PASSAGEWAY, (H) MEANS CONNECTING THE SENSING MEANS TO THE MOTOR FOR CONTINUING THE OPERATION OF THE MOTOR RESPONSIVE TO THE SENSING MEANS DETERMINE THAT THE LIQUID IS GREATER THAN CAN BE ACCOMMODATED BY THE BYPASS FLUID PASSAGEWAY; AND (I) SAID HYDRAULIC PRESSURE CONTROL VALVE MEANS ALSO FUNCTIONING AS MEANS FOR MAINTAINING A LIQUID LEVEL IN SAID SENSING MEANS WHEN SAID LIQUID DISPLACEMENT IS GREATER THAN CAN BE ACCOMMODATED BY THE BYPASS FLUID PASSAGEWAY.
Claim 2
Dependent Claim
207 words
AN OIL WELL PUMPING SYSTEM HAVING (A) A PUMP IN THE WALL, (B) A MOTOR DRIVINGLY CONNECTED TO THE PUMP, (C) A DISCHARGE LINE CONNECTED TO THE PUMP IN THE WELL, (D) A HYDRAULIC PRESSURE CONTROL MEANS FOR MAINTAINING THE HYDRAULIC PRESSURE ON THE PUMP AT A GREATER AMOUNT THAN THE PRESSURE IN THE DISCHARGE LINE DOWNSTREAM THE PRESSURE CONTROL VALVE MEANS WHEN THE PUMP IS PUMPING LIQUID, (E) A BYPASS FLUID PASSAGEWAY OPEN AT ALL TIMES CONNECTING THE DISCHARGE LINE ABOVE STREAM AND DOWNSTREAM OF THE PRESSURE CONTROL VALVE MEANS, (F) THE BYPASS FLUID PASSAGEWAY BEING SMALL AS COMPARED TO THE OPENING THROUGH THE PRESSURE CONTROL VALVE MEANS, (G) SENSING MEANS ATTACHED TO THE SYSTEM FOR DETERMINING IF LIQUID DISPLACEMENT FROM THE PUMP IS GREATER THAN CAN BE ACCOMMODATED BY THE BYPASS FLUID PASSAGEWAY, (H) MEANS CONNECTING THE SENSING MEANS TO THE MOTOR FOR CONTINUING THE OPERATION OF THE MOTOR RESPONSIVE TO THE SENSING MEANS DETERMINE THAT THE LIQUID IS GREATER THAN CAN BE ACCOMMODATED BY THE BYPASS FLUID PASSAGEWAY; AND (I) SAID HYDRAULIC PRESSURE CONTROL VALVE MEANS ALSO FUNCTIONING AS MEANS FOR MAINTAINING A LIQUID LEVEL IN SAID SENSING MEANS WHEN SAID LIQUID DISPLACEMENT IS GREATER THAN CAN BE ACCOMMODATED BY THE BYPASS FLUID PASSAGEWAY.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |