US2659438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for cementing wells
Assignee: L L RECTOR
•
Filing: 1946-08-16
•
Granted: 1953-11-17
•
Expires: 1966-08-16
Abstract
No abstract record available.
Inventors
- 👤 Sylvester B Schnitter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:46
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2435016A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |