US2317039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for determining water leakages into wells
Assignee: ROBERT V FUNK
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Filing: 1939-09-25
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Granted: 1943-04-20
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Expires: 1959-09-25
Abstract
No abstract record available.
Inventors
- 👤 George H Ennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:21
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) | 1946-04-19 | 1946-10-19 | 1947-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-04-19 | 1950-10-19 | 1951-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-04-19 | 1954-10-19 | 1955-04-20 | $7700.00 | Window Closed / Lapsed |