Patent US2736398A successfully refreshed from Google Patents.
US3122902A
Expired / Lapsed
US
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Drilling shock absorber
Assignee: DRILPRODCO Inc
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Filing: 1961-08-28
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Granted: 1964-03-03
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Expires: 1981-08-28
Abstract
No abstract record available.
Inventors
- 👤 Robert A Blair
- 👤 Hubert H Wagnon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:20
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A SHOCK ABSORBING DEVICE ADAPTED TO BE POSITIONED IN A DRILL STRING OR THE LIKE AND ROTATED THEREWITH, COMPRISING A BODY HAVING A LONGITUDINAL OPENING THERETHROUGH, SAID BODY HAVING AN UPPER TUBULAR MEMBER AND A LOWER TUBULAR MEMBER LONGITUDINALLY SPACED FROM EACH OTHER, A FLUID CONDUCTOR PIPE CONNECTED TO ONE OF SAID TUBULAR MEMBERS AND SLIDABLY DISPOSED IN THE OTHER OF SAID TUBULAR MEMBERS FOR CONDUCTING FLUID THROUGH SAID BODY EVEN THOUGH RELATIVE LONGITUDINAL MOVEMENTS OF SAID TUBULAR MEMBERS OCCUR, RESILIENT TORQUE MEANS ON
Claim 2
Dependent Claim
84 words
A SHOCK ABSORBING DEVICE ADAPTED TO BE POSITIONED IN A DRILL STRING OR THE LIKE AND ROTATED THEREWITH, COMPRISING A BODY HAVING A LONGITUDINAL OPENING THERETHROUGH, SAID BODY HAVING AN UPPER TUBULAR MEMBER AND A LOWER TUBULAR MEMBER LONGITUDINALLY SPACED FROM EACH OTHER, A FLUID CONDUCTOR PIPE CONNECTED TO ONE OF SAID TUBULAR MEMBERS AND SLIDABLY DISPOSED IN THE OTHER OF SAID TUBULAR MEMBERS FOR CONDUCTING FLUID THROUGH SAID BODY EVEN THOUGH RELATIVE LONGITUDINAL MOVEMENTS OF SAID TUBULAR MEMBERS OCCUR, RESILIENT TORQUE MEANS ON
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-03 | 1967-09-02 | 1968-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-03 | 1971-09-02 | 1972-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-03 | 1975-09-02 | 1976-03-03 | $7700.00 | Window Closed / Lapsed |