US3138214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bit force applicator
Assignee: Jersey Production Research Co
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Filing: 1961-10-02
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Granted: 1964-06-23
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Expires: 1981-10-02
Abstract
No abstract record available.
Inventors
- 👤 Harold C Bridwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:19
CPC Classifications
E; E21; E21B; E21B44/00; E21B44/005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
128 words
AN APPARATUS ATTACHABLE TO THE LOWER END OF A STRING OF DRILL PIPE FOR FORCING A BIT AGAINST THE BOTTOM OF A BOREHOLE COMPRISING IN COMBINATION: AN ARBOR CONNECTING SAID DRILL PIPE TO SAID BIT AND ADAPTED TO CONVEY FLUID FROM SAID DRILL PIPE TO SAID BIT; A PISTON ATTACHED TO SAID ARBOR; A HOUSING MEANS SURROUNDING SAID ARBOR IN A SLIDABLE ROTATABLE AND SEALING RELATIONSHIP AND DEFINING A CYLINDER FOR SAID PISTON; MEANS INCLUDING A PUMP HAVING ITS INLET IN FLUID COMMUNICATION WITH SAID CYLINDER BENEATH SAID PISTON FOR SELECTIVELY APPLYING FLUID UNDER PRESSURE ABOVE THE PISTON AND FOR WITHDRAWING FLUID FROM BELOW THE PISTON; AND WALL ANCHOR MEANS MOUNTED ON SAID HOUSING MEANS AND OPERABLE TO ANCHOR SAID HOUSING MEANS TO THE WALL OF THE BOREHOLE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |