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Patent US2998068A successfully refreshed from Google Patents.
US2998068A
Expired / Lapsed
US
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Apparatus for use in wells
Assignee: Jersey Production Research Co
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Filing: 1958-12-15
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Granted: 1961-08-29
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Expires: 1978-12-15
Abstract
No abstract record available.
Inventors
- 👤 Martin E True
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:58
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/004; E21B23/006; E21B43/00; E21B43/11; E21B43/119
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2178540A
Cited
US2316361A
Cited
US2400970A
Cited
US2429910A
Cited
US2781098A
Cited
US2785754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |