Patent US3257219A successfully refreshed from Google Patents.
US3257219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-alumina cement
Assignee: Individual
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Filing: 1962-11-01
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Granted: 1966-06-21
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Expires: 1982-11-01
Abstract
No abstract record available.
Inventors
- 👤 Klein Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:52
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
THE METHOD OF MANUFACTURING CEMENT CONSISTING ESSENTIALLY OF CALCIUM ALUMINATES WHICH CONTAIN CAO AND AL2O3 IN THE MOLECULAR RATIO OF FROM ABOUT 1:1.1 TO 3:5, WHICH COMPRISES THE STEPS OF (A) PASSING AN INTIMATE MIXTURE OF CALCAREOUS AND ALUMINOUS MATERIALS CONTAINING AT MOST 3% BY WEIGHT OF PHOSPHATES, RECKONED AS R2O5, IN PROPORTIONS TO YIELD CALCIUM OXIDE AND ALUMINA IN THE WEIGHT RATIO BETWEEN 0.5 AND 0.3 FOR FORMING CALCIUM ALUMINATE, THROUGH A ROTARY KILN, (B) PASSING A FLAME THROUGH SAID KILN AND THEREBY HEATING SAID MIXTURE THEREIN TO A TEMPERATURE BETWEEN 2000* AND 2800*F., SAID FLAME BEING CONTROLLED TO AVOID HEATING SAID MIXTURE TO ABOVE THE FUSION TEMPERATURES THEREOF, (C) CONTROLLING THE RATE OF THROUGHPUT OF SAID MIXTURE THROUGH THE KILN TO ATTAIN A RESIDENCE TIME THEREIN BETWEEN ONE AND TWO AND ONE-HALF HOURS AND BETWEEN TEN AND SIXTY MINUTES ABOVE A TEMPERATURE OF 1900*F., AND (D) GRINDING THE MATERIAL DISCHARGED FROM THE KILN TO PRODUCE A POWDER.
Claim 2
Independent Claim
159 words
THE METHOD OF MANUFACTURING CEMENT CONSISTING ESSENTIALLY OF CALCIUM ALUMINATES WHICH CONTAIN CAO AND AL2O3 IN THE MOLECULAR RATIO OF FROM ABOUT 1:1.1 TO 3:5, WHICH COMPRISES THE STEPS OF (A) PASSING AN INTIMATE MIXTURE OF CALCAREOUS AND ALUMINOUS MATERIALS CONTAINING AT MOST 3% BY WEIGHT OF PHOSPHATES, RECKONED AS R2O5, IN PROPORTIONS TO YIELD CALCIUM OXIDE AND ALUMINA IN THE WEIGHT RATIO BETWEEN 0.5 AND 0.3 FOR FORMING CALCIUM ALUMINATE, THROUGH A ROTARY KILN, (B) PASSING A FLAME THROUGH SAID KILN AND THEREBY HEATING SAID MIXTURE THEREIN TO A TEMPERATURE BETWEEN 2000* AND 2800*F., SAID FLAME BEING CONTROLLED TO AVOID HEATING SAID MIXTURE TO ABOVE THE FUSION TEMPERATURES THEREOF, (C) CONTROLLING THE RATE OF THROUGHPUT OF SAID MIXTURE THROUGH THE KILN TO ATTAIN A RESIDENCE TIME THEREIN BETWEEN ONE AND TWO AND ONE-HALF HOURS AND BETWEEN TEN AND SIXTY MINUTES ABOVE A TEMPERATURE OF 1900*F., AND (D) GRINDING THE MATERIAL DISCHARGED FROM THE KILN TO PRODUCE A POWDER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |