US2988640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method relating to the production of oil
Assignee: Individual
•
Filing: 1953-08-07
•
Granted: 1961-06-13
•
Expires: 1973-08-07
Abstract
No abstract record available.
Inventors
- 👤 Steele Francis Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:18
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/11; E21B47/111
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2433718A
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US2599975A
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US2583288A
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US2658284A
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US2588210A
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US2595610A
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US2714167A
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US2660887A
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US2726338A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |