US4076545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing calcium aluminate monosulfate hydrate
Assignee: Panasonic Electric Works Co Ltd
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Filing: 1975-11-17
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Granted: 1978-02-28
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Expires: 1995-11-17
Abstract
Abstract A process of producing calcium aluminate monosulfate hydrate by reacting a mixture of a lime component, an alumina component, a calcium sulfate component, and water at a temperature of from about 100° C. to about 200° C. By the process of this invention, the aimed product having a high purity is obtained at a high yield without need of high temperature for the reaction. The product obtained is useful as building materials.
Inventors
- 👤 Tomisaburo Azuma
- 👤 Kazuto Ichimaru
- 👤 Kouichi Tateno
- 👤 Takeru Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:46
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/68; C01F7/74; C01F7/76; C01F7/767; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C04B28/065; C04B7/00; C04B7/32; C04B7/323; G; G01; G01D; G01D2205/00; G01D2205/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
A process of producing calcium aluminate monosulfate hydrate which consists essentially of reacting a mixture of a lime component, an alumina component selected from the group consisting of alumina, hydrated alumina, activated alumina, and aluminum hydroxide, a calcium sulfate component, and water at temperatures of 100°-200° C.
Claim 2
Dependent Claim
47 words
A process of producing calcium aluminate monosulfate hydrate which consists essentially of reacting a mixture of a lime component, an alumina component selected from the group consisting of alumina, hydrated alumina, activated alumina, and aluminum hydroxide, a calcium sulfate component, and water at temperatures of 100°-200° C.
Claim 3
Dependent Claim
27 words
The process as claimed in claim 1 wherein said lime component is at least one member selected from the group consisting of calcium oxide and calcium hydroxide.
Claim 4
Dependent Claim
14 words
The process as claimed in claim 1 wherein said alumina component is activated alumina.
Claim 5
Dependent Claim
14 words
The process as claimed in claim 1 wherein said alumina component is hydrated alumina.
Claim 6
Dependent Claim
14 words
The process as claimed in claim 1 wherein said alumina component is aluminum hydroxide.
Claim 7
Dependent Claim
30 words
The process as claimed in claim 1 wherein said calcium sulfate component is at least one member selected from the group consisting of anhydrous gypsum, hemihydrate gypsum, and gypsum dihydrate.
Claim 8
Dependent Claim
42 words
The process as claimed in claim 1 wherein the mixing ratio of said lime component, alumina component, calcium sulfate component, and water is 2.4-3.3 : 0.8-1.0 (calculated as Al 2 O 3 ) : 0.8-1.0 : at least 12 by mole ratio.
Claim 9
Dependent Claim
24 words
The process as claimed in claim 7 wherein said mixing ratio is 3 : 1 : 1 : at least 12 by mole ratio.
Claim 10
Dependent Claim
14 words
The process as claimed in claim 1 wherein the reaction temperature is 160°-180° C.
Claim 11
Dependent Claim
23 words
The process as claimed in claim 1 wherein the reaction is carried out while preventing the escape of water from the reaction system.
Claim 12
Dependent Claim
67 words
The process as claimed in claim 1 wherein the mixing ratio of the lime component, alumina component, and calcium sulfate component is 3.1-3.3 : 1 (calculated as Al 2 O 3 ) : 0.9-1.0 by mole ratio, the amount of water in the reaction system is more than the amount necessary for forming calcium aluminate monosulfate hydrate, and the reaction product is produced as a hardened product.
References Cited (Backward Citations)
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US3758319A
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US3861929A
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US3834916A
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US3775143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |