US3595642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portland cement with imparted refractory character
Assignee: Motus Chemicals Inc
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Filing: 1968-09-24
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Granted: 1971-07-27
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Expires: 1988-09-24
Abstract
Abstract A REFRACTORY CEMENT IN WHICH AN ALUMINUM SILICAE, HAVING FROM ABOUT 15 TO ABOUT 27 WEIGHT PERCENT OF AN ALUMINUM OXIDE CONTENT, IS COMBINED WITH AN HYDRAULIC CEMENT TO IMPART RESISTANCE THERETO TO HIGH TEMPERATURE CHANGES. THE REFRACTORY CEMENT IS PARTICULARLY USEFUL IN CEMENTING OIL WELL CASINGS.
Inventors
- 👤 Charles H Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:14
CPC Classifications
C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B14/10; C04B28/00; C04B28/02; C04B28/04; C09; C09K; C09K8/00; C09K8/42; C09K8/46
Claims Analysis
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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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |