Patent US2546978A successfully refreshed from Google Patents.
US2546978A
Expired / Lapsed
US
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Well liner and method of cementing
Assignee: California Research LLC
•
Filing: 1946-02-18
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Granted: 1951-04-03
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Expires: 1966-02-18
Abstract
No abstract record available.
Inventors
- 👤 George A Collins
- 👤 John R Russell
- 👤 Francis L Colahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:15
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US911649A
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US1839709A
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US2054353A
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US2173034A
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US2191750A
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US2214555A
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US2360311A
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US2411260A
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US2431751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |