Patent US2755067A successfully refreshed from Google Patents.
US2755067A
Expired / Lapsed
US
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Method and apparatus for insulating a drill stem in continuous exploration of a bore hole
Assignee: Sperry Sun Well Surveying Co
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Filing: 1951-01-02
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Granted: 1956-07-17
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Expires: 1971-01-02
Abstract
No abstract record available.
Inventors
- 👤 Samuel H Williston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:43
CPC Classifications
E; E21; E21B; E21B17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD OF EXPLORING A BORE HOLE DURING DRILLING THEREOF COMPRISING LOWERING A ROTATABLE DRILL STEM INTO THE BORE HOLE, SAID DRILL STEM HAVING A DRILL BIT ATTACHED TO THE LOWER END THEREOF, APPLYING AN INSULATING COATING TO THE OUTER SURFACE OF THE DRILL STEM AS IT IS LOWERED INTO THE BORE HOLE, AND EMPLOYING THE INSULATED DRILL STEM IN THE MEASUREMENT OF AN ELECTRICAL CONDITION EXISTING IN THE VICINITY OF THE DRILL BIT.
Claim 2
Independent Claim
74 words
THE METHOD OF EXPLORING A BORE HOLE DURING DRILLING THEREOF COMPRISING LOWERING A ROTATABLE DRILL STEM INTO THE BORE HOLE, SAID DRILL STEM HAVING A DRILL BIT ATTACHED TO THE LOWER END THEREOF, APPLYING AN INSULATING COATING TO THE OUTER SURFACE OF THE DRILL STEM AS IT IS LOWERED INTO THE BORE HOLE, AND EMPLOYING THE INSULATED DRILL STEM IN THE MEASUREMENT OF AN ELECTRICAL CONDITION EXISTING IN THE VICINITY OF THE DRILL BIT.
References Cited (Backward Citations)
US1786920A
Cited
US1910674A
Cited
US1927664A
Cited
US2215377A
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US2377220A
Cited
US2368777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |