US2078426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recovering casing from wells
Assignee: WELDON C ERWIN
•
Filing: 1934-07-11
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Granted: 1937-04-27
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Expires: 1954-07-11
Abstract
No abstract record available.
Inventors
- 👤 Cecil H Sweet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:07
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/12; E21B31/16; E21B19/00; E21B47/00; E21B47/09
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) | 1940-04-26 | 1940-10-26 | 1941-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-04-26 | 1944-10-26 | 1945-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-04-26 | 1948-10-26 | 1949-04-27 | $7700.00 | Window Closed / Lapsed |