Patent US3420305A successfully refreshed from Google Patents.
US3420305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well tools
Assignee: Otis Engineering Corp
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Filing: 1966-10-26
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Granted: 1969-01-07
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Expires: 1986-10-26
Abstract
No abstract record available.
Inventors
- 👤 Alvis H Alexander
- 👤 John C Duplantis
- 👤 George T Strong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:34
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1291; E21B33/1292
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
APPARATUS FOR SEALING A FLOW PASSAGE OF A FLOW CONDUCTOR COMPRISING: A PACKER HAVING MEANS FOR ANCHORING IT IN SEALING POSITION WITHIN THE FLOW CONDUCTOR AND HAVING A LONGITUDINAL FLOW PASSAGE THERETHROUGH; A CLOSURE MEMBER INSERTABLE IN SAID FLOW PASSAGE OF SAID PACKER AND HAVING A FLOW PASSAGE THERETHROUGH CLOSABLE AT ONE END; MEANS ON SAID CLOSURE MEMBER SEALING BETWEEN SAID CLOSURE MEMBER AND SAID PACKER CLOSING OFF FLOW THEREBETWEEN; MEANS FOR RELEASABLY LOCKING SAID CLOSURE MEMBER WITHIN SAID FLOW PASSAGE OF SAID PACKER; VALVE MEANS SLIDABLE ON SAID CLOSURE MEMBER CLOSING SAID CLOSEABLE END OF SAID MEMBER AND MOVABLE TO A POSITION TO OPEN SAID CLOSEABLE END OF SAID FLOW PASSAGE OF SAID CLOSURE MEMBER TO
Claim 2
Dependent Claim
117 words
APPARATUS FOR SEALING A FLOW PASSAGE OF A FLOW CONDUCTOR COMPRISING: A PACKER HAVING MEANS FOR ANCHORING IT IN SEALING POSITION WITHIN THE FLOW CONDUCTOR AND HAVING A LONGITUDINAL FLOW PASSAGE THERETHROUGH; A CLOSURE MEMBER INSERTABLE IN SAID FLOW PASSAGE OF SAID PACKER AND HAVING A FLOW PASSAGE THERETHROUGH CLOSABLE AT ONE END; MEANS ON SAID CLOSURE MEMBER SEALING BETWEEN SAID CLOSURE MEMBER AND SAID PACKER CLOSING OFF FLOW THEREBETWEEN; MEANS FOR RELEASABLY LOCKING SAID CLOSURE MEMBER WITHIN SAID FLOW PASSAGE OF SAID PACKER; VALVE MEANS SLIDABLE ON SAID CLOSURE MEMBER CLOSING SAID CLOSEABLE END OF SAID MEMBER AND MOVABLE TO A POSITION TO OPEN SAID CLOSEABLE END OF SAID FLOW PASSAGE OF SAID CLOSURE MEMBER TO
References Cited (Backward Citations)
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US2726724A
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US2972381A
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US3211230A
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US3248129A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |