Patent US2404564A successfully refreshed from Google Patents.
Patent US3103175A successfully refreshed from Google Patents.
US3103175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping apparatus
Assignee: Texaco Inc
•
Filing: 1961-07-24
•
Granted: 1963-09-10
•
Expires: 1981-07-24
Abstract
No abstract record available.
Inventors
- 👤 Howard C Humphrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:47
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02; F04B47/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
A FREE PISTON PUMP FOR A PRODUCING WELL HAVING A CASING AND WITH POWER FLUID TUBING AND PRODUCTION TUBING POSITIONED IN SAID PRODUCING WELL AND SPACED FROM SAID CASING THEREOF COMPRISING THE COMBINATION OF A PAIR OF SPACED IMPERFORATE PISTONS HOUSED IN SAID POWER FLUID TUBING, ROD MEANS INTERCONNECTING AND SPACING SAID PAIR OF IMPERFORATE PISTONS FROM EACH OTHER, INLET MEANS FOR PRODUCTION FLUID LEADING TO SAID POWER FLUID TUBING AND LOCATED BELOW ONE OF SAID PAIR OF PISTONS AND INCLUDING A CHECK VALVE WHICH OPENS WHEN SAID PISTONS MOVE ON AN INTAKE STROKE AND CLOSES WHEN SAID PISTONS MOVE ON A DISCHARGE STROKE, DUCT MEANS ESTABLISHING COMMUNICATION BETWEEN SAID POWER FLUID TUBING AND SAID PRODUCTION TUBING, ONE OF SAID DUCT MEANS BEING IN OPEN COMMUNICATION AT ALL TIMES BETWEEN SAID PRODUCTION TUBING AND SAID POWER FLUID TUBING LEADING TO THE CHAMBER THEREIN BETWEEN SAID PISTONS AND ANOTHER OF SAID DUCT MEANS BEING LOCATED ADJACENT SAID INLET MEANS, AND DISCHARGE CONTROL MEANS COMPRISING A SECOND CHECK VALVE WHICH OPENS WHEN SAID PISTONS MOVE ON A DISCHARGE STROKE AND CLOSES WHEN SAID PISTONS MOVE ON AN INTAKE STROKE AND BEING LOCATED ADJACENT SAID ANOTHER OF SAID DUCT MEANS ADJACENT SAID INLET MEANS.
Claim 2
Dependent Claim
201 words
A FREE PISTON PUMP FOR A PRODUCING WELL HAVING A CASING AND WITH POWER FLUID TUBING AND PRODUCTION TUBING POSITIONED IN SAID PRODUCING WELL AND SPACED FROM SAID CASING THEREOF COMPRISING THE COMBINATION OF A PAIR OF SPACED IMPERFORATE PISTONS HOUSED IN SAID POWER FLUID TUBING, ROD MEANS INTERCONNECTING AND SPACING SAID PAIR OF IMPERFORATE PISTONS FROM EACH OTHER, INLET MEANS FOR PRODUCTION FLUID LEADING TO SAID POWER FLUID TUBING AND LOCATED BELOW ONE OF SAID PAIR OF PISTONS AND INCLUDING A CHECK VALVE WHICH OPENS WHEN SAID PISTONS MOVE ON AN INTAKE STROKE AND CLOSES WHEN SAID PISTONS MOVE ON A DISCHARGE STROKE, DUCT MEANS ESTABLISHING COMMUNICATION BETWEEN SAID POWER FLUID TUBING AND SAID PRODUCTION TUBING, ONE OF SAID DUCT MEANS BEING IN OPEN COMMUNICATION AT ALL TIMES BETWEEN SAID PRODUCTION TUBING AND SAID POWER FLUID TUBING LEADING TO THE CHAMBER THEREIN BETWEEN SAID PISTONS AND ANOTHER OF SAID DUCT MEANS BEING LOCATED ADJACENT SAID INLET MEANS, AND DISCHARGE CONTROL MEANS COMPRISING A SECOND CHECK VALVE WHICH OPENS WHEN SAID PISTONS MOVE ON A DISCHARGE STROKE AND CLOSES WHEN SAID PISTONS MOVE ON AN INTAKE STROKE AND BEING LOCATED ADJACENT SAID ANOTHER OF SAID DUCT MEANS ADJACENT SAID INLET MEANS.
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) | 1966-09-09 | 1967-03-11 | 1967-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-09 | 1971-03-11 | 1971-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-09 | 1975-03-11 | 1975-09-10 | $7700.00 | Window Closed / Lapsed |