Patent US2650195A successfully refreshed from Google Patents.
US2650195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing loss of fluid into thief formations
Assignee: Dow Chemical Co
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Filing: 1952-05-26
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Granted: 1953-08-25
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Expires: 1972-05-26
Abstract
No abstract record available.
Inventors
- 👤 Paul H Cardwell
- 👤 Jr Frank H Braunlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:42
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003; Y; Y10; Y10S; Y10S507/00; Y10S507/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |