Patent US4014291A successfully refreshed from Google Patents.
Patent US3194313A successfully refreshed from Google Patents.
US3194313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth drilling rigs
Assignee: FNRD Ltd
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Filing: 1961-08-22
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Granted: 1965-07-13
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Expires: 1981-08-22
Abstract
No abstract record available.
Inventors
- 👤 Fanshawe Hew Dalrymple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:55
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
AN EARTH DRILLING RIG FOR HANDLING A DRILL PIPE STRING CONSISTING OF A PLURALITY OF CONNECTED DRILL PIPE SECTIONS COMPRISING A PLURALITY OF VERTICALLY MOVABLE PIPE STRING PULLING MECHANISMS, MEANS OPERABLE DURING THE VERTICAL MOVEMENT OF SAID MECHANISM FOR CAUSING SAID MECHANISMS TO SUCCESSIVELY ENGAGE, PULL AND RELEASE SAID PIPE STRING, AND MEANS CARRIED BY AT LEAST ONE OF SAID MECHANISMS FOR DISCONNECTING PIPE SECTIONS FROM SAID PIPE STRING WHILE SAID STRING IS IN MOTION.
Claim 2
Dependent Claim
75 words
AN EARTH DRILLING RIG FOR HANDLING A DRILL PIPE STRING CONSISTING OF A PLURALITY OF CONNECTED DRILL PIPE SECTIONS COMPRISING A PLURALITY OF VERTICALLY MOVABLE PIPE STRING PULLING MECHANISMS, MEANS OPERABLE DURING THE VERTICAL MOVEMENT OF SAID MECHANISM FOR CAUSING SAID MECHANISMS TO SUCCESSIVELY ENGAGE, PULL AND RELEASE SAID PIPE STRING, AND MEANS CARRIED BY AT LEAST ONE OF SAID MECHANISMS FOR DISCONNECTING PIPE SECTIONS FROM SAID PIPE STRING WHILE SAID STRING IS IN MOTION.
References Cited (Backward Citations)
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Cited
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Cited
US2781185A
Cited
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Cited
US2867338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |