US4183760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength alumina ceramic product and method of forming
Assignee: Electric Power Research Institute
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Filing: 1977-11-18
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Granted: 1980-01-15
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Expires: 1997-11-18
Abstract
Abstract A high strength ceramic product especially adapted for electrical porcelain insulators and including alumina, clay, and flux (nepheline syenite or potassium feldspar). The alumina content is from 45 to 60% by weight of the ceramic body. The product is formed by conventional wet processing. By controlling the size of alumina and flux, a high modulus of rupture (in excess of 30,000 psi) is imparted to the fired ceramic product.
Inventors
- 👤 James E. Funk
- 👤 Ira O. Knickerbocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:33
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B33/00; C04B33/24; C04B33/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
The method of producing a high-strength ceramic body comprising the steps of comminuting alumina to break up essentially all agglomerates in excess of 20 microns, mixing said comminuted alumina, clay, and flux with water in sufficient quantity to form a plastic extrudable aqueous mass, said alumina comprising from about 45 to about 60% by weight of solids content of the mass, extruding said aqueous mass into the desired configuration, and drying and firing the mass to form a ceramic body.
Claim 2
Independent Claim
80 words
The method of producing a high-strength ceramic body comprising the steps of comminuting alumina to break up essentially all agglomerates in excess of 20 microns, mixing said comminuted alumina, clay, and flux with water in sufficient quantity to form a plastic extrudable aqueous mass, said alumina comprising from about 45 to about 60% by weight of solids content of the mass, extruding said aqueous mass into the desired configuration, and drying and firing the mass to form a ceramic body.
Claim 3
Dependent Claim
25 words
The method of claim 1, in which the mean particle size of the flux in said aqueous mass is no greater than about 20 microns.
Claim 4
Dependent Claim
14 words
The method of claim 1 in which the desired configuration is an electrical insulator.
Claim 5
Dependent Claim
16 words
The method of claim 1 in which said alumina comprises at least 50% of said mixture.
Claim 6
Dependent Claim
12 words
The method of claim 1 in which said flux comprises nepheline syenite.
Claim 7
Dependent Claim
18 words
The method of claim 1 in which the weight ratio of clay to flux is at least 1:1.
Claim 8
Dependent Claim
24 words
The method of claim 1 in which the total clay and flux comprises at least 35% of the solids content of the aqueous mass.
Claim 9
Independent Claim
79 words
The method of producing a high-strength ceramic body comprising the steps of mixing alumina, previously comminuted to break up essentially all agglomerates in excess of 20 microns, with clay, flux and water in sufficient quantity to form a plastic extrudable aqueous mass, said alumina comprising from about 45 to about 60% by weight of the solids content of the mass, extruding said aqueous mass into the desired configuration, and drying and firing the mass to form a ceramic body.
Claim 10
Independent Claim
79 words
The method of producing a high-strength ceramic body comprising the steps of mixing alumina, previously comminuted to break up essentially all agglomerates in excess of 20 microns, with clay, flux and water in sufficient quantity to form a plastic extrudable aqueous mass, said alumina comprising from about 45 to about 60% by weight of the solids content of the mass, extruding said aqueous mass into the desired configuration, and drying and firing the mass to form a ceramic body.
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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |