Patent US3156300A successfully refreshed from Google Patents.
US3156300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for protecting wells
Assignee: Individual
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Filing: 1963-08-14
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Granted: 1964-11-10
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Expires: 1983-08-14
Abstract
No abstract record available.
Inventors
- 👤 John S Page
- 👤 Jr John S Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B34/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
APPARATUS FOR PROTECTING A FLOWING WELL AGAINST THE LOSS OF FLUID PRODUCTS OF THE WELL FROM A CONDUIT AT THE TOP OF THE WELL, INCLUDING: MEANS AT THE TOP OF THE WELL ADAPTED TO BE MOVED BY FORCES WHICH IF SUSTAINED BY THE CONDUIT AT THE TOP OF THE WELL WOULD CAUSE SUCH LOSS; VALVE MEANS LOCATED IN THE WELL BELOW SAID FLOW STRUCTURE, SAID VALVE MEANS INCLUDING A BODY OPEN TO WELL FLUIDS THEREBELOW AND HAVING A PASSAGE LEADING TO THE WELL ABOVE THE VALVE MEANS FROM SAID BODY; A VALVE ELEMENT IN SAID BODY SHIFTABLE TO A POSITION CLOSING SAID PASSAGE TO CLOSE THE VALVE MEANS AND TO A POSITION SPACED FROM SAID PASSAGE
Claim 2
Dependent Claim
116 words
APPARATUS FOR PROTECTING A FLOWING WELL AGAINST THE LOSS OF FLUID PRODUCTS OF THE WELL FROM A CONDUIT AT THE TOP OF THE WELL, INCLUDING: MEANS AT THE TOP OF THE WELL ADAPTED TO BE MOVED BY FORCES WHICH IF SUSTAINED BY THE CONDUIT AT THE TOP OF THE WELL WOULD CAUSE SUCH LOSS; VALVE MEANS LOCATED IN THE WELL BELOW SAID FLOW STRUCTURE, SAID VALVE MEANS INCLUDING A BODY OPEN TO WELL FLUIDS THEREBELOW AND HAVING A PASSAGE LEADING TO THE WELL ABOVE THE VALVE MEANS FROM SAID BODY; A VALVE ELEMENT IN SAID BODY SHIFTABLE TO A POSITION CLOSING SAID PASSAGE TO CLOSE THE VALVE MEANS AND TO A POSITION SPACED FROM SAID PASSAGE
References Cited (Backward Citations)
GB774784A
Cited
US2963089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |