Patent US3713862A successfully refreshed from Google Patents.
US3437136A
Expired / Lapsed
US
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Retrievable well packer apparatus
Assignee: Individual
•
Filing: 1967-12-28
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Granted: 1969-04-08
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Expires: 1987-12-28
Abstract
No abstract record available.
Inventors
- 👤 David E Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:37
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1295; E21B33/12955
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3233675A
Cited
US3277965A
Cited
US3308886A
Cited
US3288219A
Cited
US3338308A
Cited
US3361207A
Cited
US3339637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |