Patent US3277965A successfully refreshed from Google Patents.
US3277965A
Expired / Lapsed
US
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Well packer
Assignee: Otis Engineering Corp
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Filing: 1963-10-17
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Granted: 1966-10-11
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Expires: 1983-10-17
Abstract
No abstract record available.
Inventors
- 👤 George G Grimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:31
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1295; E21B33/12955
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
AN APPARATUS ADAPTED TO BE LOWERED INTO A WELL CONDUCTOR INCLUDING: A MANDREL; A PACKING STRUCTURE ON SAID MANDREL INCLUDING A SLEEVE, NORMALLY RETRACTED RESILIENT PLIANT ELASTIC PACKING MEANS ON SAID SLEEVE ADAPTED TO ENGAGE THE WELL CONDUCTOR; MEANS FOR EXPANDING SAID PACKING MEANS AGAINST THE WELL CONDUCTOR; SAID MANDREL AND SAID SLEEVE PROVIDING AN EXTERNAL LONGITUDINALLY EXTENDING FLUID BYPASS EXTENDING THROUGH SAID SLEEVE; VALVE MEANS ON SAID MANDREL CLOSING SAID BYPASS WHILE SAID APPARATUS IS BEING LOWERED INTO THE WALL CONDUCTOR AND MOVABLE TO AN OPEN POSITION WHEN THE PACKING MEANS IS EXPANDED TO SEALING POSITION; SECOND MEANS CLOSING SAID BYPASS AGAINST UPWARD FLOW THERETHROUGH AFTER SAID VALVE MEANS HAS BEEN MOVED TO OPEN POSITION WHEN SAID PACKING MEANS IS EXPANDED INTO SEALING ENGAGEMENT WITH THE WELL CONDUCTOR; AND MEANS BIASING SAID VALVE MEANS TO CLOSED POSITION WHEREBY SAID VALVE MEANS IS MOVABLE FROM CLOSED POSITION BY A PREDETERMINED FLUID PRESSURE IN SAID BYPASS.
Claim 2
Independent Claim
155 words
AN APPARATUS ADAPTED TO BE LOWERED INTO A WELL CONDUCTOR INCLUDING: A MANDREL; A PACKING STRUCTURE ON SAID MANDREL INCLUDING A SLEEVE, NORMALLY RETRACTED RESILIENT PLIANT ELASTIC PACKING MEANS ON SAID SLEEVE ADAPTED TO ENGAGE THE WELL CONDUCTOR; MEANS FOR EXPANDING SAID PACKING MEANS AGAINST THE WELL CONDUCTOR; SAID MANDREL AND SAID SLEEVE PROVIDING AN EXTERNAL LONGITUDINALLY EXTENDING FLUID BYPASS EXTENDING THROUGH SAID SLEEVE; VALVE MEANS ON SAID MANDREL CLOSING SAID BYPASS WHILE SAID APPARATUS IS BEING LOWERED INTO THE WALL CONDUCTOR AND MOVABLE TO AN OPEN POSITION WHEN THE PACKING MEANS IS EXPANDED TO SEALING POSITION; SECOND MEANS CLOSING SAID BYPASS AGAINST UPWARD FLOW THERETHROUGH AFTER SAID VALVE MEANS HAS BEEN MOVED TO OPEN POSITION WHEN SAID PACKING MEANS IS EXPANDED INTO SEALING ENGAGEMENT WITH THE WELL CONDUCTOR; AND MEANS BIASING SAID VALVE MEANS TO CLOSED POSITION WHEREBY SAID VALVE MEANS IS MOVABLE FROM CLOSED POSITION BY A PREDETERMINED FLUID PRESSURE IN SAID BYPASS.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |