US2650068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coring method and apparatus
Assignee: Union Oil Company of California
•
Filing: 1949-01-31
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Granted: 1953-08-25
•
Expires: 1969-01-31
Abstract
No abstract record available.
Inventors
- 👤 William W Rand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:47
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B7/124; E21B25/00; E21B25/16; E21B25/18; Y; Y10; Y10S; Y10S173/00; Y10S173/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US801072A
Cited
US2176477A
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US2197062A
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US2252620A
Cited
US2489566A
Cited
US2536303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |