Patent US3158207A successfully refreshed from Google Patents.
US3158207A
Expired / Lapsed
US
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Combination roller cone and spark discharge drill bit
Assignee: JERSEY PRODUCTTION RES Co
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Filing: 1961-08-14
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Granted: 1964-11-24
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Expires: 1981-08-14
Abstract
No abstract record available.
Inventors
- 👤 David S Rowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:44
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/007; E21B10/00; E21B10/08; E21B10/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
IN A METHOD OF DRILLING A BOREHOLE IN THE EARTH BY ROTATING A ROLLER CONE-TYPE, MULTI-CUTTER DRILL BIT AGAINST THE BOTTOM OF THE BOREHOLE WHILE LOADING THE BIT AND CIRCULATING A LIQUID DRILLING FLUID WITHIN THE BOREHOLE, THE IMPROVEMENT WHICH COMPRISES GENERATING ELECTRICAL SPARK DISCHARGES INTERMITTENTLY AROUND THE PERIPHERY OF
Claim 2
Dependent Claim
50 words
IN A METHOD OF DRILLING A BOREHOLE IN THE EARTH BY ROTATING A ROLLER CONE-TYPE, MULTI-CUTTER DRILL BIT AGAINST THE BOTTOM OF THE BOREHOLE WHILE LOADING THE BIT AND CIRCULATING A LIQUID DRILLING FLUID WITHIN THE BOREHOLE, THE IMPROVEMENT WHICH COMPRISES GENERATING ELECTRICAL SPARK DISCHARGES INTERMITTENTLY AROUND THE PERIPHERY OF
References Cited (Backward Citations)
CH147729A
Cited
US2700131A
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US2822148A
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US2866622A
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US2898084A
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US2901223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |