Patent US3587734A successfully refreshed from Google Patents.
US3587734A
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US
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Adapter for converting a stationary blowout preventer to a rotary blowout preventer
Assignee: SHAFCO IND Inc
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Filing: 1969-09-08
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Granted: 1971-06-28
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Expires: 1989-09-08
Abstract
Abstract AN ADAPTER FOR CONVERTING A STATIONARY BLOWOUT PREVENTER TO A ROTARY BLOWOUT PREVENTER INCLUDES A HOUSING WITH A CYLINDRICAL OUTER SURFACE FOR BEING SEALINGLY ENGAGED BY THE BLOWOUT PREVENTER RUBBER SEAL, A RADIALLY OUTWARDLY EXTENDING FLANGE ON EITHER AXIAL END THEREOF FOR ENGAGEMENT WITH THE METAL REINFORCING OF THE RUBBER SEAL UPON RELATIVE AXIAL DISPLACEMENT THEREBETWEEN TO HALT THE DISPLACEMENT, AND A TUBULAR INNER MEMBER ROTATABLY MOUNTED WITHIN THE HOUSING AND ITSELF MOUNTING A SEAL FOR SEALINGLY ENGAGING A ROTATING PIPE TOOL EXTENDING THROUGH THE ADAPTER.
Inventors
- 👤 Donald U Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:12
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/064; E21B33/08; E21B33/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |