US2923531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling
Assignee: Superior Oil Co
•
Filing: 1956-04-26
•
Granted: 1960-02-02
•
Expires: 1976-04-26
Abstract
No abstract record available.
Inventors
- 👤 Robert F Bauer
- 👤 Stratton Hal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:00
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B7/128; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/064; E21B33/10; E21B33/12; E21B33/127; E21B33/035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US720137A
Cited
US962019A
Cited
US1331014A
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US1469574A
Cited
US1598439A
Cited
US1766628A
Cited
US2187871A
Cited
US2217879A
Cited
US2399656A
Cited
US2606003A
Cited
US2777669A
Cited
US2808230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |