US2767792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple horizon oil production method
Assignee: Individual
•
Filing: 1953-06-10
•
Granted: 1956-10-23
•
Expires: 1973-06-10
Abstract
No abstract record available.
Inventors
- 👤 Spearow Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:14
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1252557A
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US1816260A
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US2107006A
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US2277380A
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US2403987A
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US2368428A
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US2325218A
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US2593497A
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US2665759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |