US3669701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight cements for oil wells
Assignee: Cities Service Oil Co
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Filing: 1970-10-29
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Granted: 1972-06-13
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Expires: 1990-10-29
Abstract
Abstract DISCLOSED HEREIN IS A LIGHWEIGHT CEMENT WHICH UTILIZES SMALL CENOSPHERES PRIMARLY CONSISTING OF SILICA-ALUMINA. THIS MATERIAL KNOWN AS FLOAT ASH IS ESSENTIALLY THAT PORTION OF FLY ASH THAT FLOATS ON WATER AND HAS SPECIFIC GRAVITY AROUND 0.7. THE LIGHTNESS OF FLOAT ASH AND ITS INHERENT COMPRESSIVE STRENGTH MAKE IT DESIRABLE AS AN INGREDIENT FOR DECREASING THE WEIGHT AND IMPROVING THE STRENGTH OF OIL WELL CEMENTS.
Inventors
- 👤 Edwin W Biederman Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:48
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/18; C04B18/00; C04B18/04; C04B18/06; C04B18/08; C04B18/082; C09; C09K; C09K8/00; C09K8/42; C09K8/46; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S106/00; Y10S106/01
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |