US2857286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of portland cement
Assignee: Missouri Portland Cement Co
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Filing: 1955-11-23
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Granted: 1958-10-21
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Expires: 1975-11-23
Abstract
No abstract record available.
Inventors
- 👤 Ralph H Striker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:51
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/1018; C04B20/1022; C04B24/00; C04B24/04; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20396; Y10T74/20402; Y10T74/20408
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
THE PROCESS OF TREATING PORTLAND CEMENT OF THE CHARACTER WHICH HAS A TENDENCY TO DRY SET, TO MAKE THE CEMENT FREE FLOWING WITHOUT RENDERING IT WATER REPELLENT, WHICH COMPRISES CONTACTING DRY PARTICLES OF SAID PORTLAND CEMENT IN AIR WITH A MATERIAL TAKEN FROM THE GROUP CONSISTING OF ACETIC ACID AND WATER SOLUBLE SALTS OF ACETIC ACID HAVING A GREATER SOLUBILITY THAN CALCIUM ACETATE, IN AN AMOUNT, CALCULATED AS ACETIC ACID, BETWEEN ABOUT 0.01% AND 1.0% BY WEIGHT OF THE DRY CEMENT, AND FORMING CALCIUM ACETATE IN SITU ON SAID PARTICLES.
Claim 2
Dependent Claim
90 words
THE PROCESS OF TREATING PORTLAND CEMENT OF THE CHARACTER WHICH HAS A TENDENCY TO DRY SET, TO MAKE THE CEMENT FREE FLOWING WITHOUT RENDERING IT WATER REPELLENT, WHICH COMPRISES CONTACTING DRY PARTICLES OF SAID PORTLAND CEMENT IN AIR WITH A MATERIAL TAKEN FROM THE GROUP CONSISTING OF ACETIC ACID AND WATER SOLUBLE SALTS OF ACETIC ACID HAVING A GREATER SOLUBILITY THAN CALCIUM ACETATE, IN AN AMOUNT, CALCULATED AS ACETIC ACID, BETWEEN ABOUT 0.01% AND 1.0% BY WEIGHT OF THE DRY CEMENT, AND FORMING CALCIUM ACETATE IN SITU ON SAID PARTICLES.
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) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |