Patent US3136256A successfully refreshed from Google Patents.
US3136256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface pump and drive
Assignee: United States Steel Corp
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Filing: 1962-10-12
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Granted: 1964-06-09
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Expires: 1982-10-12
Abstract
No abstract record available.
Inventors
- 👤 Roy L Chenault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:06
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/08; F04B9/10; F04B9/103; F04B9/107; F04B9/1073
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A SUBSURFACE PUMP COMPRISING AN ELONGATED TUBULAR BARREL, A VERTICALLY MOVABLE RECIPROCABLE ELEMENT HOUSED WITHIN SAID BARREL AND ADAPTED TO MAKE INTAKE AND DELIVERY STROKES AS IT TRAVELS IN OPPOSITE DIRECTIONS, A FIRST VALVE WHICH CLOSES DURING A DELIVERY STROKE BUT OPENS DURING AN INTAKE STROKE TO ADMIT FLUID TO SAID BARREL, A SECOND VALVE WHICH CLOSES DURING AN INTAKE STROKE BUT OPENS DURING A DELIVERY STROKE TO ENABLE SAID ELEMENT TO FORCE FLUID FROM SAID BARREL, SAID BARREL HAVING A VENT PORT INTERMEDIATE ITS LENGTH, SAID ELEMENT REACHING A POSITION NEAR THE END OF ITS INTAKE STROKE IN WHICH SAID PORT AFFORDS COMMUNICATION BETWEEN THE INTERIOR OF SAID BARREL AND THE EXTERIOR BUT OTHERWISE CLOSING SAID PORT, AND MEANS FOR HOLDING SAID FIRST VALVE OPEN WHEN SAID ELEMENT REACHES THE END OF ITS INTAKE STROKE TO ALLOW VOLATILES TO
Claim 2
Dependent Claim
140 words
A SUBSURFACE PUMP COMPRISING AN ELONGATED TUBULAR BARREL, A VERTICALLY MOVABLE RECIPROCABLE ELEMENT HOUSED WITHIN SAID BARREL AND ADAPTED TO MAKE INTAKE AND DELIVERY STROKES AS IT TRAVELS IN OPPOSITE DIRECTIONS, A FIRST VALVE WHICH CLOSES DURING A DELIVERY STROKE BUT OPENS DURING AN INTAKE STROKE TO ADMIT FLUID TO SAID BARREL, A SECOND VALVE WHICH CLOSES DURING AN INTAKE STROKE BUT OPENS DURING A DELIVERY STROKE TO ENABLE SAID ELEMENT TO FORCE FLUID FROM SAID BARREL, SAID BARREL HAVING A VENT PORT INTERMEDIATE ITS LENGTH, SAID ELEMENT REACHING A POSITION NEAR THE END OF ITS INTAKE STROKE IN WHICH SAID PORT AFFORDS COMMUNICATION BETWEEN THE INTERIOR OF SAID BARREL AND THE EXTERIOR BUT OTHERWISE CLOSING SAID PORT, AND MEANS FOR HOLDING SAID FIRST VALVE OPEN WHEN SAID ELEMENT REACHES THE END OF ITS INTAKE STROKE TO ALLOW VOLATILES TO
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |