US2966221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling process and apparatus
Assignee: Union Oil Company of California
•
Filing: 1956-11-23
•
Granted: 1960-12-27
•
Expires: 1976-11-23
Abstract
No abstract record available.
Inventors
- 👤 Lloyd J Kinney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:11
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1829304A
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US1902972A
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US2201878A
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US2576872A
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US2709071A
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US2805042A
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US2808230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |