Patent US3459261A successfully refreshed from Google Patents.
US3459261A
Expired / Lapsed
US
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Pressure differential expanding means for well packers
Assignee: Baker Hughes Holdings LLC
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Filing: 1965-12-13
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Granted: 1969-08-05
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Expires: 1985-12-13
Abstract
No abstract record available.
Inventors
- 👤 Chudleigh B Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:38
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1295
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3180419A
Cited
US3211227A
Cited
US3223169A
Cited
US3394762A
Cited
US3391740A
Cited
US3339637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |