Patent US3074492A successfully refreshed from Google Patents.
US3074492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling system
Assignee: ExxonMobil Oil Corp
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Filing: 1957-06-05
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Granted: 1963-01-22
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Expires: 1977-06-05
Abstract
No abstract record available.
Inventors
- 👤 Dayton H Clewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:54
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A DOUBLE-ACTING WELL-DRILLING TOOL CARRIED AT THE LOWER END OF A DRILL STRING COMPRISING TWO ELONGATED CONCENTRIC CYLINDERS, MEANS INCLUDING CONNECTING STRUCTURE FOR ATTACHMENT OF THE UPPER ENDS OF SAID CYLINDERS TO SAID DRILL STRING FOR APPLICATION BY THE DRILL STRING TO SAID CYLINDERS OF A DOWNWARD FORCE, CYLINDRICAL COUPLING MEMBERS ATTACHED TO THE LOWER ENDS OF SAID CYLINDERS, A BIT HAVING TWO SECTIONS EACH IN CIRCULAR ARRAY AND RESPECTIVELY ATTACHED TO SAID COUPLING MEMBERS, SAID COUPLING MEMBERS BEING MADE OF NON-MAGNETIZABLE MATERIAL AND SAID DRIVING CYLINDERS BEING MADE OF A MAGNETIZABLE MATERIAL, ELECTRICAL MEANS INCLUDING A WINDING MAGNETICALLY COUPLED TO SAID CYLINDERS, AN ALTERNATING CURRENT SUPPLY CIRCUIT CONNECTED TO SAID
Claim 2
Dependent Claim
111 words
A DOUBLE-ACTING WELL-DRILLING TOOL CARRIED AT THE LOWER END OF A DRILL STRING COMPRISING TWO ELONGATED CONCENTRIC CYLINDERS, MEANS INCLUDING CONNECTING STRUCTURE FOR ATTACHMENT OF THE UPPER ENDS OF SAID CYLINDERS TO SAID DRILL STRING FOR APPLICATION BY THE DRILL STRING TO SAID CYLINDERS OF A DOWNWARD FORCE, CYLINDRICAL COUPLING MEMBERS ATTACHED TO THE LOWER ENDS OF SAID CYLINDERS, A BIT HAVING TWO SECTIONS EACH IN CIRCULAR ARRAY AND RESPECTIVELY ATTACHED TO SAID COUPLING MEMBERS, SAID COUPLING MEMBERS BEING MADE OF NON-MAGNETIZABLE MATERIAL AND SAID DRIVING CYLINDERS BEING MADE OF A MAGNETIZABLE MATERIAL, ELECTRICAL MEANS INCLUDING A WINDING MAGNETICALLY COUPLED TO SAID CYLINDERS, AN ALTERNATING CURRENT SUPPLY CIRCUIT CONNECTED TO SAID
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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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |