US4383890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic sheet and method for producing the same
Assignee: Nittetsu Mining Co Ltd
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Filing: 1981-03-02
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Granted: 1983-05-17
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Expires: 2001-03-02
Abstract
Abstract A ceramic sheet comprising 5 to 50 wt. % (absolute dry weight) of a cation-modified pulp having a degree of substitution of cationic group of 0.02 to 0.04 and beaten to freeness of 200 to 100 ml C.S.F. and 50 to 95 wt. % of fine inorganic particles dispersed uniformly in and supported by said cation-modified pulp. This ceramic sheet can be easily prepared from an aqueous suspension of the cation-modified pulp and the fine inorganic particles by using a paper-making treatment.
Inventors
- 👤 Masayuki Oshima
- 👤 Yasuhiko Matsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:41
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/68; C; C04; C04B; C04B18/00; C04B18/04; C04B18/18; C04B18/24; C04B18/241; C04B30/00; C04B30/02; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/636; C04B35/6365; C04B38/00; C04B38/008; C04B38/0083; C04B38/06; C04B38/063; C04B38/0635; C04B38/0645; C04B38/0675; D21H11/00; D21H11/16; D21H11/20; D21H11/22; F; F28; F28F; F28F21/00; F28F21/04; C04B2111/00; C04B2111/00474; C04B2111/0081; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
103 words
A method for producing a ceramic sheet comprising the steps of: preparing a cation-modified cellulose pulp having a degree of substitution of cationic group of 0.02 to 0.04; beating said cation-modified pulp to a freeness of 200 to 100 ml C.S.F; mixing said cation-modified pulp thus beaten with fine inorganic particles in the presence of water to form an aqueous suspension, the ratio of said cation-modified pulp being from 5 to 50 wt.% (absolute dry weight) and that of said fine inorganic particles being from 50 to 95 wt.%; and forming a ceramic sheet by subjecting said aqueous suspension to a paper-making treatment.
Claim 2
Independent Claim
103 words
A method for producing a ceramic sheet comprising the steps of: preparing a cation-modified cellulose pulp having a degree of substitution of cationic group of 0.02 to 0.04; beating said cation-modified pulp to a freeness of 200 to 100 ml C.S.F; mixing said cation-modified pulp thus beaten with fine inorganic particles in the presence of water to form an aqueous suspension, the ratio of said cation-modified pulp being from 5 to 50 wt.% (absolute dry weight) and that of said fine inorganic particles being from 50 to 95 wt.%; and forming a ceramic sheet by subjecting said aqueous suspension to a paper-making treatment.
Claim 3
Dependent Claim
25 words
The method for producing a ceramic sheet according to claim 1 wherein said fine inorganic particles contain fine particles of at least one sinterable substance.
Claim 4
Dependent Claim
21 words
The method for producing a ceramic sheet according to claim 2 wherein said sinterable substance is fine particles of clayish substance.
Claim 5
Dependent Claim
40 words
The method for producing a ceramic sheet according to claim 3 wherein the amount of said fine particles of said clayish substance to be added is from 5 to 50 wt.% to the total amount of said fine inorganic particles.
Claim 6
Dependent Claim
56 words
A ceramic sheet comprising: 5 to 50 wt.% (absolute dry weight) of a cation-modified cellulose pulp having a degree of substitution of cationic group of 0.02 to 0.04 and beaten to freeness of 200 to 100 ml C.S.F.; and 50 to 95 wt.% of fine inorganic particles dispersed uniformly in and supported by said cation-modified pulp.
Claim 7
Dependent Claim
56 words
A ceramic sheet comprising: 5 to 50 wt.% (absolute dry weight) of a cation-modified cellulose pulp having a degree of substitution of cationic group of 0.02 to 0.04 and beaten to freeness of 200 to 100 ml C.S.F.; and 50 to 95 wt.% of fine inorganic particles dispersed uniformly in and supported by said cation-modified pulp.
Claim 8
Dependent Claim
21 words
The ceramic sheet according to claim 5 wherein said fine inorganic particles contain fine particles of at least one sinterable substance.
Claim 9
Dependent Claim
17 words
The ceramic sheet according to claim 6 wherein said sinterable substance is fine particles of clayish substance.
Claim 10
Dependent Claim
33 words
The ceramic sheet according to claim 7 wherein the amount of said fine particles of said clayish substance is from 5 to 50 wt.% to the total amount of said fine inorganic particles.
Claim 11
Independent Claim
138 words
A method for producing a sintered ceramic structure comprising the steps of: preparing a cation-modified cellulose pulp having a degree of substitution of cationic group of 0.02 to 0.04; beating said cation-modified pulp to a freeness of 200 to 100 ml C.S.F.; mixing said cation-modified pulp thus beaten with fine inorganic particle in the presence of water to form an aqueous suspension, the ratio of said cation-modified pulp being from 5 to 50 wt.% (absolute dry weight) and that of said fine inorganic particles being from 50 to 95 wt.%, said fine inorganic particles containing fine particles of at least one sinterable substance; forming a ceramic sheet by subjecting said aqueous suspension to a paper-making treatment; shaping the resulting ceramic sheet into a structure having a desired shape; and sintering said structure to form the sintered ceramic structure.
Claim 12
Independent Claim
138 words
A method for producing a sintered ceramic structure comprising the steps of: preparing a cation-modified cellulose pulp having a degree of substitution of cationic group of 0.02 to 0.04; beating said cation-modified pulp to a freeness of 200 to 100 ml C.S.F.; mixing said cation-modified pulp thus beaten with fine inorganic particle in the presence of water to form an aqueous suspension, the ratio of said cation-modified pulp being from 5 to 50 wt.% (absolute dry weight) and that of said fine inorganic particles being from 50 to 95 wt.%, said fine inorganic particles containing fine particles of at least one sinterable substance; forming a ceramic sheet by subjecting said aqueous suspension to a paper-making treatment; shaping the resulting ceramic sheet into a structure having a desired shape; and sintering said structure to form the sintered ceramic structure.
Claim 13
Dependent Claim
22 words
The method for producing a sintered ceramic structure according to claim 9 wherein said sinterable substance is fine particles of clayish substance.
Claim 14
Dependent Claim
38 words
The method for producing a sintered ceramic structure according to claim 10 wherein the amount of said fine particles of said clayish substance is from 5 to 50 wt.% to the total amount of said fine inorganic particles.
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JPS5035408A
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US4210490A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |