US3146837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for obtaining trube core samples
Assignee: Jersey Production Research Co
•
Filing: 1958-12-30
•
Granted: 1964-09-01
•
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 05:33
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
Cited
US2256552A
Cited
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 |