Patent US3711306A successfully refreshed from Google Patents.
US3711306A
Expired / Lapsed
US
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Method of producing cement
Assignee: Individual
•
Filing: 1969-05-09
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Granted: 1973-01-16
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Expires: 1989-05-09
Abstract
Abstract A METHOD OF PRODUCING CEMENT COMPRISING CALCINATING A RAW MIX AT A TEMPERATURE NOT HIGHER THAN 1380*C. UNTIL THE CONTENT OF FREE LIME IN THE CLINKER REACHES 1.515''% BY WEIGHT, AND SUBSEQUENTLY GRINDING THE OBTAINED CLINKER WITH ADDITION, DEPENDING ON THE CONTENT OF FREE LIME THEREIN, TO A DEGREE OF FINENESS DETERMINED BY THE FORMULA S$400CAOFREE+2000 CM.2/G. WHERE S=SPECIFIC SURFACE OF CEMENT, CM.2/G.; CAOFREE=CONTENT OF FREE LIME IN THE CLINKER.
Inventors
- 👤 N Kogan
- 👤 Petrosyan O Mchedlov
- 👤 V Satarin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:44
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |