Patent US3968707A successfully refreshed from Google Patents.
US3454091A
Expired / Lapsed
US
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Down hole self-adjusting tubing anchor
Assignee: Cook Testing Co
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Filing: 1967-02-14
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Granted: 1969-07-08
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Expires: 1987-02-14
Abstract
No abstract record available.
Inventors
- 👤 John S Page Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:08
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/04; E21B23/0411; E21B23/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1619268A
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US2332749A
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US2350973A
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US2435899A
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US2624409A
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US2765855A
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US3045758A
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US3136364A
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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) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |