Patent US6643696B2 successfully refreshed from Google Patents.
US4334931A
Expired / Lapsed
US
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Method for producing asbestos free machinable calcium silicate high heat-resistant material
Assignee: Nichias Corp
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Filing: 1981-03-16
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Granted: 1982-06-15
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Expires: 2001-03-16
Abstract
Abstract The asbestos-free calcium silicate heat-resistant material composition, comprises: (A) 100 parts by weight of a mixture of lime and siliceous material having a CaO/SiO 2 mole ratio of 0.6-1.2; (B) 20-170 parts by weight of xonotlite obtained by hydrothermal synthesis; (C) 15-150 parts by weight of fibrous wollastonite; and (D) water in an amount of 2-8 times as much as that of the total solid contents and is produced by a method which comprises the steps of: (i) molding a slurry of a uniform mixture of that recited above in (A) to (D). (ii) steam curing said molded body in an atmosphere of steam under a pressure of not less than 6 kg/cm 2 to react the siliceous material with the lime; and (iii) heat treating said steam cured product to remove water therefrom at a temperature of not lower then 100° C. under atmospheric pressure.
Inventors
- 👤 Hiroshi Asaumi
- 👤 Kazuo Kubota
- 👤 Hisanori Yokoo
- 👤 Mitsuo Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:57
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/18; C04B28/186; C04B28/188; C04B2111/00; C04B2111/10; C04B2111/12; C04B2111/20; C04B2111/28; Y; Y02; Y02P; Y02P40/00; Y02P40/60; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
Asbestos-free calcium silicate heat-resistant green material composition, which comprises: (A) 100 parts by weight of a mixture of lime and siliceous material having a CaO/SiO 2 mole ratio of 0.6-1.2; (B) 20-170 parts by weight of xonotlite obtained by hydrothermal synthesis; (C) 15-150 parts by weight of fibrous wollastonite; and (D) water in an amount of 2-8 times as much as that of the total solid contents.
Claim 2
Dependent Claim
67 words
Asbestos-free calcium silicate heat-resistant green material composition, which comprises: (A) 100 parts by weight of a mixture of lime and siliceous material having a CaO/SiO 2 mole ratio of 0.6-1.2; (B) 20-170 parts by weight of xonotlite obtained by hydrothermal synthesis; (C) 15-150 parts by weight of fibrous wollastonite; and (D) water in an amount of 2-8 times as much as that of the total solid contents.
Claim 3
Dependent Claim
27 words
The composition as in claim 1, wherein the amount of xonotlite is 30-100 parts by weight and the amount of fibrous wollastonite is 50-100 parts by weight.
Claim 4
Independent Claim
134 words
A method for producing an asbestos-free calcium silicate type heat-resistant material, including the steps of: (i) molding a slurry of a uniform mixture of: (A) 100 parts by weight of a mixture of lime and siliceous material having a CaO/SiO 2 mole ratio of 0.6-1.2; (B) 20-170 parts by weight of xonotlite obtained by hydrothermal synthesis; (C) 15-150 parts by weight of fibrous wollastonite; and (D) water in an amount of 2-8 times as much as that of the total solid contents. (ii) steam curing said molded body in an atmosphere of steam under a pressure of not less than 6 kg/cm 2 to react the siliceous material with the lime; and (iii) heat treating said steam-cured product to remove water therefrom at a temperature of not lower than 100° C. under atmospheric pressure.
Claim 5
Independent Claim
134 words
A method for producing an asbestos-free calcium silicate type heat-resistant material, including the steps of: (i) molding a slurry of a uniform mixture of: (A) 100 parts by weight of a mixture of lime and siliceous material having a CaO/SiO 2 mole ratio of 0.6-1.2; (B) 20-170 parts by weight of xonotlite obtained by hydrothermal synthesis; (C) 15-150 parts by weight of fibrous wollastonite; and (D) water in an amount of 2-8 times as much as that of the total solid contents. (ii) steam curing said molded body in an atmosphere of steam under a pressure of not less than 6 kg/cm 2 to react the siliceous material with the lime; and (iii) heat treating said steam-cured product to remove water therefrom at a temperature of not lower than 100° C. under atmospheric pressure.
Claim 6
Dependent Claim
25 words
The method according to claim 3, wherein the heat treating of step (iii) is carried out at a temperature of 330°-1000° C. under atmospheric pressure.
Claim 7
Dependent Claim
14 words
A molded, steam-cured and heat-treated material consisting essentially of the product of claim 3.
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) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |