Patent US4180538A successfully refreshed from Google Patents.
US4180538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making ceramic shaped article from inorganic raw material powder by extrusion molding
Assignee: Niterra Co Ltd
•
Filing: 1977-01-17
•
Granted: 1979-12-25
•
Expires: 1997-01-17
Abstract
Abstract A method of making a ceramic shaped article from an inorganic raw material powder by extrusion molding is disclosed. The method comprises the steps of kneading an inorganic raw material powder with a plasticizer to obtain a kneaded body which is then molded by extrusion into a fluid having a high humidity to obtain a ceramic shaped article having no deformation and strain. The plasticizer is selected from the group consisting of mono-liquid type resin which is a water insoluble synthetic resin dissolved in a water soluble solvent and a hydraulic setting resin mainly consisting of polyurethane isocyanate prepolymer.
Inventors
- 👤 Akira Morikawa
- 👤 Yoshinori Narita
- 👤 Junichi Mizutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63416; B; B28; B28B; B28B3/00; B28B3/20; B28B3/26; B28B3/269; C04B33/00; C04B33/02; C04B33/13; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C04B35/6342; C04B35/63448; C04B35/63456
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A method of making a honeycomb-shaped ceramic article by extrusion molding, comprising the steps of kneading an inorganic ceramic raw material powder with a plasticizer formed of a resin which is a water insoluble synthetic resin dissolved in a water soluble solvent, to form a kneaded body, the volume ratio of said inorganic raw material to said plasticizer being in the range of 100:50 to 100:200, and shaping a honeycomb-shaped ceramic article by extruding said kneaded body through a shaped orifice and then into water for hardening the honeycomb-shaped ceramic article without deformation or strain.
Claim 2
Independent Claim
95 words
A method of making a honeycomb-shaped ceramic article by extrusion molding, comprising the steps of kneading an inorganic ceramic raw material powder with a plasticizer formed of a resin which is a water insoluble synthetic resin dissolved in a water soluble solvent, to form a kneaded body, the volume ratio of said inorganic raw material to said plasticizer being in the range of 100:50 to 100:200, and shaping a honeycomb-shaped ceramic article by extruding said kneaded body through a shaped orifice and then into water for hardening the honeycomb-shaped ceramic article without deformation or strain.
Claim 3
Dependent Claim
74 words
A method of making a honeycomb-shaped ceramic article from an inorganic ceramic raw material powder by extrusion molding as claimed in claim 1, wherein said inorganic raw material powder is selected from the group consisting of: a cordierite composition powder mainly consisting of 2MgO, 2Al 2 O 3 and 5SiO 2 , a high-alumina composition powder mainly consisting of Al 2 O 3 , and a cemented carbide powder mainly consisting of tungsten carbide.
Claim 4
Dependent Claim
45 words
A method of making a honeycomb-shaped ceramic article from an inorganic ceramic raw material powder by extrusion molding as claimed in claim 1, wherein said water insoluble synthetic resin is selected from the group consisting of: polyurethane resin, vinyl acetate resin and polyvinyl butyral resin.
Claim 5
Dependent Claim
40 words
A method of making a honeycomb-shaped ceramic article from an inorganic ceramic raw material powder by extrusion molding as claimed in claim 1, wherein said water soluble solvent is selected from the group consisting of: dimethyl formaldehyde, methanol, and ethanol.
Claim 6
Dependent Claim
30 words
A method of making a honeycomb-shaped ceramic article as claimed in claim 1, wherein said honeycomb-shaped ceramic article comprising walls of thickness of not more than 1.5 to 2 mm.
Claim 7
Dependent Claim
28 words
A method of making a honeycomb-shaped ceramic article as claimed in claim 1, additionally comprising the step of sintering the shaped article after hardening in the aqueous fluid.
Claim 8
Dependent Claim
24 words
A method of making a honeycomb-shaped ceramic article as claimed in claim 1, wherein said ratio is in the range of 100:70 to 100:180.
References Cited (Backward Citations)
US2593507A
Cited
US3790654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |