US5132255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic compositions of inorganic powders and sintered bodies of the same
Assignee: Takeda Pharmaceutical Co Ltd
•
Filing: 1990-05-24
•
Granted: 1992-07-21
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Expires: 2010-05-24
Abstract
Abstract An aqueous plastic composition of an inorganic powder which per se has substantially no plasticity which comprises: the inorganic powder and a polysaccharide of natural origin. The molding and sintering of the plastic composition provide a sintered body of high mechanical strength and dimensional accuracy.
Inventors
- 👤 Tatsuro Takeuchi
- 👤 Tetsuya Sahara
- 👤 Motoya Mouri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:20
CPC Classifications
C; C04; C04B; C04B35/00; C04B33/00; C04B33/02; C04B33/04; C04B24/00; C04B24/08; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/636; C04B35/6365
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
59 words
An aqueous plastic composition of a technical ceramic powder which per se has substantially no plasticity which comprises: a technical ceramic powder selected from the group consisting of oxides, carbides, nitrides, borides, kaolinite, natural kaolin, talc, sepiolite, synthesized clay, hydroxyapatite, and mixtures thereof and curdlan in an amount of about 0.1-10% by weight based on the technical ceramic powder.
Claim 2
Dependent Claim
59 words
An aqueous plastic composition of a technical ceramic powder which per se has substantially no plasticity which comprises: a technical ceramic powder selected from the group consisting of oxides, carbides, nitrides, borides, kaolinite, natural kaolin, talc, sepiolite, synthesized clay, hydroxyapatite, and mixtures thereof and curdlan in an amount of about 0.1-10% by weight based on the technical ceramic powder.
Claim 3
Dependent Claim
33 words
The plastic composition of claim 1 wherein the composition contains a molding assistance compound selected from the group consisting of a cellulosic compound, a polyhydric compound, a polyvinyl compound and a mixture thereof.
Claim 4
Dependent Claim
18 words
The composition of claim 1, wherein the powder has a particle size of not more than 1 micron.
Claim 5
Independent Claim
101 words
A method of producing a sintered body of a technical ceramic powder which per se has substantially no plasticity which comprises: admixing and kneading a technical ceramic powder selected from the group consisting of oxides, carbides, nitrides, borides, kaolinite, natural kaolin, talc, sepiolite, synthesized clay, hydroxyapatite, and mixtures thereof with curdlan in an amount of about 0.1-10% by weight based on the technical ceramic powder in the presence of water in amounts sufficient to provide a plastic composition, molding the plastic composition, drying the plastic composition, and sintering the plastic composition at a temperature of not less than about 800° C.
Claim 6
Independent Claim
101 words
A method of producing a sintered body of a technical ceramic powder which per se has substantially no plasticity which comprises: admixing and kneading a technical ceramic powder selected from the group consisting of oxides, carbides, nitrides, borides, kaolinite, natural kaolin, talc, sepiolite, synthesized clay, hydroxyapatite, and mixtures thereof with curdlan in an amount of about 0.1-10% by weight based on the technical ceramic powder in the presence of water in amounts sufficient to provide a plastic composition, molding the plastic composition, drying the plastic composition, and sintering the plastic composition at a temperature of not less than about 800° C.
Claim 7
Dependent Claim
33 words
The method of claim 4 wherein the plastic composition contains a molding assistance compound selected from the group consisting of a cellulosic compound, a polyhydric compound, a polyvinyl compound and a mixture thereof.
Claim 8
Dependent Claim
18 words
The method of claim 4, wherein the powder has a particle size of not more than 1 micron.
Claim 9
Dependent Claim
50 words
The method of claim 4 wherein the technical ceramic powder is a member selected from the group consisting of alumina, titania, synthesized cordierite, silicon carbide, boron carbide, tungsten carbide, silicon nitride, aluminum nitride, boron nitride, zirconium boride, titanium boride, kaolinite, natural kaolin, talc, sepiolite, synthesized clay, hydroxyapatite and mixtures thereof.
Claim 10
Dependent Claim
24 words
The method of claim 4 wherein the technical ceramic powder is a member selected from the group consisting of alumina, titania and synthesized cordierite.
Claim 11
Dependent Claim
26 words
The method of claim 4 wherein the technical ceramic powder is a member selected from the group consisting of silicon carbide, boron carbide and tungsten carbide.
Claim 12
Dependent Claim
26 words
The method of claim 4 wherein the technical ceramic powder is a member selected from the group consisting of silicon nitride, aluminum nitride and boron nitride.
Claim 13
Dependent Claim
24 words
the method of claim 4 wherein the technical ceramic powder is a member selected from the group consisting of zirconium boride and titanium boride.
Claim 14
Dependent Claim
28 words
The method of claim 4 wherein the technical ceramic powder is a member selected from the group consisting of kaolinite, natural kaolin, talc, sepiolite, synthesized clay and hydroxyapatite.
Claim 15
Dependent Claim
12 words
The method of claim 4 wherein the technical ceramic powder is alumina.
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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) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |