Patent US3398795A successfully refreshed from Google Patents.
US3398795A
Expired / Lapsed
US
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Retrievable well packers
Assignee: Otis Engineering Corp
•
Filing: 1965-08-16
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Granted: 1968-08-27
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Expires: 1985-08-16
Abstract
No abstract record available.
Inventors
- 👤 Thomas L Elliston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:36
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/128; E21B17/00; E21B17/02; E21B17/04; E21B17/06; E21B33/129; E21B33/1291; E21B33/1292
Claims Analysis
Total Claims: 0
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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) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |