US3677781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making cement clinkers
Assignee: United States Steel Corp
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Filing: 1970-07-24
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Granted: 1972-07-18
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Expires: 1990-07-24
Abstract
Abstract THE METHOD OF MAKING CEMENT CLINKERS WHICH INCLUDES PREHEATING A CALCIUM ALUMINATE OR CALCIUM SILICATE RAW MIX IN GRANULAR FORM TO REMOVE SURFACE WATER AND WATER OF CRYSTALLIZATION THEREFROM, AND THEN RAPIDLY HEATING THE PREHEATED RAW MIX TO A TEMPERATURE BELOW THE MELTING POINT OF THE RAW MIX BUT NOT MORE THAN 500* F. BELOW THE MILTING POINT OF CALCIUM SILICATE RAW MIXES NOT MORE THAN 250* F. BELOW THE MELTING POINT OF CALCIUM ALUMINATE RAW MIXES. CASO4 IS ADDED TO FERRUGINOUS CALCIUM ALUMINATE RAW MIXES TO BROADEN THE SINTERING RANGE. ALSO, IMPROVED CEMENTS MADE ACCORDING TO THIS METHOD.
Inventors
- 👤 Hubert O Nickelsen
- 👤 Joseph E Kopanda
- 👤 Felix J Piasecki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:09
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/432
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |