US2425531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of detecting leakage in oil wells
Assignee: Sunoco Inc
•
Filing: 1944-09-30
•
Granted: 1947-08-12
•
Expires: 1964-09-30
Abstract
No abstract record available.
Inventors
- 👤 Nathaniel G Haseltine
- 👤 Bock Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:23
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/113
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1749928A
Cited
US2024720A
Cited
US2203720A
Cited
US2334475A
Cited
US2213138A
Cited
US2219274A
Cited
US2335409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-11 | 1951-02-10 | 1951-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-11 | 1955-02-10 | 1955-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-11 | 1959-02-10 | 1959-08-12 | $7700.00 | Window Closed / Lapsed |