Patent US3074352A successfully refreshed from Google Patents.
US3074352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well pump
Assignee: Pan American Petroleum Corp
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Filing: 1961-03-03
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Granted: 1963-01-22
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Expires: 1981-03-03
Abstract
No abstract record available.
Inventors
- 👤 Renic P Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:51
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02; F04B47/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A PUMP HAVING IN COMBINATION A BARREL, A HOLLOW ROD MEMBER EXTENDING INTO SAID BARREL, A GUIDEPIECE AT THE UPPER END OF SAID BARREL ADAPTED TO HOLD SAID ROD MEMBER PARALLEL AND CONCENTRIC WITH THE LONGITUDINAL AXIS OF SAID BARREL WHILE SAID ROD MEMBER RECIPROCATES THEREIN, A PLUNGER IN SAID BARREL, SAID ROD MEMBER CARRYING SAID PLUNGER AND COMMUNICATING WITH THE REMOTE SIDE OF SAID PLUNGER, VALVE MEANS IN SAID BARREL SPACED ABOVE SAID PLUNGER AND DEFINING A VARIABLE-VOLUME CHAMBER THEREBETWEEN, AN OUTLET COMMUNICATING WITH SAID CHAMBER AND WITH THE SPACE BETWEEN SAID HOLLOW ROD AND SAID GUIDEPIECE, COMMUNICATION THROUGH SAID OUTLET BEING CONTROLLED BY SAID VALVE MEANS, PASSAGE MEANS IN SAID PLUNGER FOR THE FLOW OF FLUIDS THROUGH SAID PLUNGER, AND MEANS ON THE SIDE OF SAID PLUNGER ADJACENT SAID CHAMBER FOR PREVENTING THE DOWNWARD FLOW OF LIQUIDS THROUGH SAID PLUNGER ON THE UPSTROKE OF SAID PLUNGER.
Claim 2
Dependent Claim
148 words
A PUMP HAVING IN COMBINATION A BARREL, A HOLLOW ROD MEMBER EXTENDING INTO SAID BARREL, A GUIDEPIECE AT THE UPPER END OF SAID BARREL ADAPTED TO HOLD SAID ROD MEMBER PARALLEL AND CONCENTRIC WITH THE LONGITUDINAL AXIS OF SAID BARREL WHILE SAID ROD MEMBER RECIPROCATES THEREIN, A PLUNGER IN SAID BARREL, SAID ROD MEMBER CARRYING SAID PLUNGER AND COMMUNICATING WITH THE REMOTE SIDE OF SAID PLUNGER, VALVE MEANS IN SAID BARREL SPACED ABOVE SAID PLUNGER AND DEFINING A VARIABLE-VOLUME CHAMBER THEREBETWEEN, AN OUTLET COMMUNICATING WITH SAID CHAMBER AND WITH THE SPACE BETWEEN SAID HOLLOW ROD AND SAID GUIDEPIECE, COMMUNICATION THROUGH SAID OUTLET BEING CONTROLLED BY SAID VALVE MEANS, PASSAGE MEANS IN SAID PLUNGER FOR THE FLOW OF FLUIDS THROUGH SAID PLUNGER, AND MEANS ON THE SIDE OF SAID PLUNGER ADJACENT SAID CHAMBER FOR PREVENTING THE DOWNWARD FLOW OF LIQUIDS THROUGH SAID PLUNGER ON THE UPSTROKE OF SAID PLUNGER.
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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |