US1865847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of locating the point of entry of water into oil wells
Assignee: ROBERT V FUNK
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Filing: 1929-06-03
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Granted: 1932-07-05
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Expires: 1949-06-03
Abstract
No abstract record available.
Inventors
- 👤 George H Ennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:31
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/113; E21B47/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-07-05 | 1936-01-04 | 1936-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-07-05 | 1940-01-04 | 1940-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-07-05 | 1944-01-04 | 1944-07-05 | $7700.00 | Window Closed / Lapsed |