US3411583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Petroleum recovery method
Assignee: Union Oil Company of California
•
Filing: 1965-12-02
•
Granted: 1968-11-19
•
Expires: 1985-12-02
Abstract
No abstract record available.
Inventors
- 👤 Le Roy W Holm
- 👤 Byron B Woertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:34
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/18; E21B43/164; Y; Y02; Y02P; Y02P90/00; Y02P90/70; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2623596A
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US3256933A
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US2822872A
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US2885003A
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US3075918A
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US3100528A
Cited
US3262498A
Cited
US3333637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |