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Patent US2312018A successfully refreshed from Google Patents.
US2312018A
Expired / Lapsed
US
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Method of and means for cleaning wells
Assignee: Individual
•
Filing: 1939-08-19
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Granted: 1943-02-23
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Expires: 1959-08-19
Abstract
No abstract record available.
Inventors
- 👤 Fred G Beckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:50
CPC Classifications
E; E21; E21B; E21B37/00; E21B21/00; E21B21/10; E21B21/103; E21B49/00; E21B49/02
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) | 1946-02-22 | 1946-08-24 | 1947-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-02-22 | 1950-08-24 | 1951-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-02-22 | 1954-08-24 | 1955-02-23 | $7700.00 | Window Closed / Lapsed |