US3353613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid spring tensile energy accumulator and shock absorbing device for well pipe strings
Assignee: Houston Engineers Inc
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Filing: 1965-09-24
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Granted: 1967-11-21
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Expires: 1985-09-24
Abstract
No abstract record available.
Inventors
- 👤 Harry W Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:47
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/107; E21B31/113
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
146 words
A COMBINED TENSILE ENERGY ACCUMULATOR AND SHOCK ABSORBING DEVICE FOR WELL STRINGS, SAID DEVICE COMPRISING AN ELONGATED TUBULAR BODY, MEANS FORMED AT ONE END OF SAID BODY FOR DETACHABLY CONNECTIN A JARRING TOOL, A MANDREL SLIDABLY RECEIVED IN SAID BODY, MEANS ON SAID MANDREL FOR DETACHABLY CONNECTING A WELL PIPE STRING, SAID MANDREL BEING FORMED EXTERIORLY SO AS TO PROVIDE A SMALL DIAMETER PORTION RADIALLY SPACED THROUGHOUT ITS LENGTH FROM THE PORTION OF SAID BODY DISPOSED CIRCUMFERENTIALLY THEREAROUND, AND A LARGER DIAMETER PORTION SPACED CLOSE TO BUT IN NON-FLUID TIGHT RELATION WITH THE PORTION OF SAID HOUSING DISPOSED CIRCUMFERENTIALLY THEREAROUND, FIRST PACKING MEANS DISPOSED WITHIN SAID BODY ADJACENT SAID SMALL DIAMETER PORTION OF SAID MANDREL, SECOND PACKING MEANS DISPOSED WITHIN SAID BODY ADJACENT SAID LARGER DIAMETER PORTION OF SAID MANDREL, SAID PACKING MEANS, SAID BODY, AND THE EXTERIOR OF SAID MANDREL DEFINING A CLOSED, FLUID TIGHT
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |