Patent US3130987A successfully refreshed from Google Patents.
US3130987A
Expired / Lapsed
US
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Pipe anchor
Assignee: Smith International Inc
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Filing: 1961-12-18
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Granted: 1964-04-28
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Expires: 1981-12-18
Abstract
No abstract record available.
Inventors
- 👤 Charles F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:27
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/0422
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
IN COMBINATION, A WELL HEAD HAVING AN ANNULAR SEAT THEREIN AND A GENERALLY CYLINDRICAL PORTION BELOW THE SEAT, A SANDWICH PACKOFF RESTING ON SAID SEAT, A SEGMENTED BOWL BELOW SAID SANDWICH PACKOFF HAVING A CYLINDRICAL OUTER PORTION DISPOSED IN SAID CYLINDRICAL PORTION OF SAID WELL HEAD AND HAVING A CONICALLY TAPERED INTERIOR, A SET OF SLIPS IN SAID BOWL, SAID SLIPS HAVING PIPE GRIPPING MEANS ON THEIR FRONT FACES AND THE BACK FACES OF SAID SLIPS BEING CONICALLY TAPERED CORRELATIVE TO SAID TAPER OF THE INTERIOR OF THE BOWL, INDENTING MEANS ON THE BACK FACES OF SAID SLIPS, AND MEANS CONNECTED TO SAID BOWL AND SAID SANDWICH PACKOFF TO COMPRESS SAID SANDWICH PACKOFF AS SAID BOWL MOVES DOWN IN SAID WELL HEAD, SAID INDENTING MEANS ON THE BACKS OF SAID SLIPS REDUCING THE FRICTIONAL RESISTANCE BETWEEN SAID BOWL AND SAID WELL HEAD AT SAID CYLINDRICAL PORTION THEREOF TO PROMOTE SUFFICIENT DOWNWARD TRAVEL OF SAID BOWL TO ACTUATE SAID PACKOFF TO SEALING POSITION EVEN WHEN THE LOAD TRANSMITTED TO SAID BOWL BY SAID SLIPS GRIPPING A WELL PIPE IS LOW.
Claim 2
Dependent Claim
179 words
IN COMBINATION, A WELL HEAD HAVING AN ANNULAR SEAT THEREIN AND A GENERALLY CYLINDRICAL PORTION BELOW THE SEAT, A SANDWICH PACKOFF RESTING ON SAID SEAT, A SEGMENTED BOWL BELOW SAID SANDWICH PACKOFF HAVING A CYLINDRICAL OUTER PORTION DISPOSED IN SAID CYLINDRICAL PORTION OF SAID WELL HEAD AND HAVING A CONICALLY TAPERED INTERIOR, A SET OF SLIPS IN SAID BOWL, SAID SLIPS HAVING PIPE GRIPPING MEANS ON THEIR FRONT FACES AND THE BACK FACES OF SAID SLIPS BEING CONICALLY TAPERED CORRELATIVE TO SAID TAPER OF THE INTERIOR OF THE BOWL, INDENTING MEANS ON THE BACK FACES OF SAID SLIPS, AND MEANS CONNECTED TO SAID BOWL AND SAID SANDWICH PACKOFF TO COMPRESS SAID SANDWICH PACKOFF AS SAID BOWL MOVES DOWN IN SAID WELL HEAD, SAID INDENTING MEANS ON THE BACKS OF SAID SLIPS REDUCING THE FRICTIONAL RESISTANCE BETWEEN SAID BOWL AND SAID WELL HEAD AT SAID CYLINDRICAL PORTION THEREOF TO PROMOTE SUFFICIENT DOWNWARD TRAVEL OF SAID BOWL TO ACTUATE SAID PACKOFF TO SEALING POSITION EVEN WHEN THE LOAD TRANSMITTED TO SAID BOWL BY SAID SLIPS GRIPPING A WELL PIPE IS LOW.
References Cited (Backward Citations)
US2887754A
Cited
US2824757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |