US3220480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface apparatus for operating well tools
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1961-02-06
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Granted: 1965-11-30
•
Expires: 1981-02-06
Abstract
No abstract record available.
Inventors
- 👤 William D Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:15
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/06; E21B23/065
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
126 words
IN APPARATUS FOR OPERATING A WELL DEVICE IN A WELL BORE: A CYLINDER; MEANS ON SAID CYLINDER FOR CONNECTING SAID CYLINDER TO A RUNNING-IN STRING FOR LOWERING THE APPARATUS IN THE WELL BORE; A HOLLOW PISTON MOVABLE IN SAID CYLINDER AND INCLUDING AN ACTUATING PISTON HEAD AND A ROD PORTION EXTENDING FROM SAID HEAD, SAID PISTON HAVING A PASSAGE FROM ITS INTERIOR TO THE CYLINDER ON THE HIGH PRESSURE SIDE OF SAID HEAD; SAID HEAD AND ROD PORTION BEING IN FLUID TIGHT ENGAGEMENT WITH SAID CYLINDER TO PROVIDE A CLOSED FLUID TIGHT SPACE ON THE LOW PRESSURE SIDE OF SAID HEAD; AND MEANS FOR DIRECTING FLUID UNDER PRESSURE INTO SAID HOLLOW PISTON AND PASSAGE WHEREBY SAID FLUID UNDER PRESSURE MOVES SAID PISTON RELATIVELY IN SAID CYLINDER.
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |