Patent US3146837A successfully refreshed from Google Patents.
US3146837A
Expired / Lapsed
US
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System for obtaining trube core samples
Assignee: Jersey Production Research Co
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Filing: 1958-12-30
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Granted: 1964-09-01
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Expires: 1978-12-30
Abstract
No abstract record available.
Inventors
- 👤 Harold C Bridwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:44
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
AN APPARATUS FOR OBTAINING A TRUE FLUID CONTENT CORE AND ARRANGED TO BE OPERATED AT THE LOWER END OF A STRING OF DRILL PIPE IN A BOREHOLE WHICH COMPRISES IN COMBINATION: AN OUTER HOUSING; MEANS FOR CLOSING THE ANNULAR SPACE BETWEEN THE LOWER PORTION OF SAID HOUSING AND THE WALL OF SAID BOREHOLE; A DRILLABLE PLATE MEANS CLOSING THE LOWER END OF SAID HOUSING; A PRESSURE CORE BARREL AND CORE BIT WITHIN SAID HOUSING; MEANS TO ROTATE SAID CORE BIT WHEREBY AS SAID CORE BIT IS ROTATED A CORE IS CUT AND MEANS FOR SEALING THE UPPER END OF SAID HOUSING.
References Cited (Backward Citations)
US2214551A
Cited
US2146263A
Cited
US2264449A
Cited
US2238609A
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US2256552A
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US2373323A
Cited
US2541785A
Cited
US2830667A
Cited
US2880969A
Cited
US2862691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |