Patent US3351372A successfully refreshed from Google Patents.
US3351372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split hook hoisting apparatus
Assignee: Dresser Industries Inc
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Filing: 1966-05-02
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Granted: 1967-11-07
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Expires: 1986-05-02
Abstract
No abstract record available.
Inventors
- 👤 William M Marks
- 👤 James E Ashworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:09
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/02; E21B19/04; E21B19/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
IN A HOISTING MECHANISM INCLUDING A TRAVELING BLOCK FOR HANDLING PIPE IN WELL OPERATIONS, THE IMPROVEMENT WHICH COMPRISES; MEANS ADAPTED FOR ALTERNATELY DETACHABLY SUPPORTING A MUD, SWIVEL BAIL AND A PIPE ELEVATOR FROM THE TRAVELING BLOCK, SAID MEANS INCLUDING A PAIR OF OPPOSED MEMBERS EACH HAVING A LOWER PORTION AND AN UPPER PORTION INCLUDING MEANS FOR CONNECTING THE UPPER PORTION OF EACH MEMBER TO SAID TRAVELING BLOCK FOR FREE SWINGING MOVEMENT OF THE PORTIONS OF SAID MEMBERS BELOW SAID CONNECTING MEANS TOWARD AND AWAY FROM EACH OTHER IN ONE PLANE, EACH OF SAID LOWER PORTIONS PROVIDING A HOOK IN THE FORM OF AN INCOMPLETE LOOP EXTENDING TRANSVERSELY OF SAID PLANE AND DISCONTINUOUS ALONG ONE SIDE ADAPTED WHEN THE MEMBERS ARE SWUNG TOWARRD EACH OTHER, FOR THE HOOK OF EACH MEMBER TO MOVE LATERALLY OF SAID PLANE AND THROUGH SAID DISCONTINUOUS PORTION TO ENGAGE A MUD SWIVEL BAIL AND WHEN SWUNG APART, FOR THE HOOK OF EACH MEMBER TO MOVE LATERALLY OF SAID PLANE AND THROUGH SAID DISCONTINUOUS PORTION TO ENGAGE OPPOSITE SIDES OF A PIPE ELEVATOR.
Claim 2
Dependent Claim
176 words
IN A HOISTING MECHANISM INCLUDING A TRAVELING BLOCK FOR HANDLING PIPE IN WELL OPERATIONS, THE IMPROVEMENT WHICH COMPRISES; MEANS ADAPTED FOR ALTERNATELY DETACHABLY SUPPORTING A MUD, SWIVEL BAIL AND A PIPE ELEVATOR FROM THE TRAVELING BLOCK, SAID MEANS INCLUDING A PAIR OF OPPOSED MEMBERS EACH HAVING A LOWER PORTION AND AN UPPER PORTION INCLUDING MEANS FOR CONNECTING THE UPPER PORTION OF EACH MEMBER TO SAID TRAVELING BLOCK FOR FREE SWINGING MOVEMENT OF THE PORTIONS OF SAID MEMBERS BELOW SAID CONNECTING MEANS TOWARD AND AWAY FROM EACH OTHER IN ONE PLANE, EACH OF SAID LOWER PORTIONS PROVIDING A HOOK IN THE FORM OF AN INCOMPLETE LOOP EXTENDING TRANSVERSELY OF SAID PLANE AND DISCONTINUOUS ALONG ONE SIDE ADAPTED WHEN THE MEMBERS ARE SWUNG TOWARRD EACH OTHER, FOR THE HOOK OF EACH MEMBER TO MOVE LATERALLY OF SAID PLANE AND THROUGH SAID DISCONTINUOUS PORTION TO ENGAGE A MUD SWIVEL BAIL AND WHEN SWUNG APART, FOR THE HOOK OF EACH MEMBER TO MOVE LATERALLY OF SAID PLANE AND THROUGH SAID DISCONTINUOUS PORTION TO ENGAGE OPPOSITE SIDES OF A PIPE ELEVATOR.
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) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |