Patent US3098696A successfully refreshed from Google Patents.
Patent US1812943A successfully refreshed from Google Patents.
US1812943A
Expired / Lapsed
US
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Means for locating leaks in well tubing
Assignee: Individual
•
Filing: 1928-09-26
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Granted: 1931-07-07
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Expires: 1948-09-26
Abstract
No abstract record available.
Inventors
- 👤 Paul H Granger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:25
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/117; Y; Y10; Y10T; Y10T137/00; Y10T137/9029
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) | 1934-07-06 | 1935-01-05 | 1935-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-07-06 | 1939-01-05 | 1939-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-07-06 | 1943-01-05 | 1943-07-07 | $7700.00 | Window Closed / Lapsed |