Patent US3686008A successfully refreshed from Google Patents.
US3686008A
Expired / Lapsed
US
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Aqueous hydraulic cement slurry
Assignee: Schlumberger Technology Corp
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Filing: 1970-06-15
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Granted: 1972-08-22
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Expires: 1990-06-15
Abstract
Abstract AN IMPROVED AQUEOUS HYDRAULIC CEMENT SLURRY WHICH MAY BE RETAINED IN A PUMPABLE FLUID STATE FOR AN INDEFINITE TIME (AND ACCORDINGLY USED AS A WELL-DRILLING CIRCULATING FLUID) BY ADMIXTURE THEREWITH OF A HEPTOLACTONE, PARTICULARLY D-GLUCO-D-GULOHEPROLACTONE, AND JUST PRIOR TO ULTIMATE EMPLACEMENT OF THE SLURRY CONTAINING THE ADDITIVE, ADMIXING THEREWITH A POLYVALENT METAL SALT ACCELERATOR TO THE SETTING RATE, E.G. CACL2.
Inventors
- 👤 Hugh T Harrison
- 👤 Korwin J Goodwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:22
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/10; C04B28/00; C04B28/02
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |