US3941604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast-firing ceramic composition and ceramic article made therefrom
Assignee: Philips North America LLC
•
Filing: 1971-03-22
•
Granted: 1976-03-02
•
Expires: 1991-03-22
Abstract
Abstract Scrap glass is crushed and mixed with selected quantities of ball clay and wollastonite, the resulting raw-mix is press-molded into a green compact, and the latter is fired in air at a temperature above the softening point of the glass particles to provide a ceramic article that has a dense impervious structure and is electrically non-conductive. Selective amounts of bentonite and an inorganic pigment can also be included in the raw-mix formulation and talc, petalite or potter's flint can be substituted for the wollastonite. By properly correlating the molding pressure and firing schedule with the raw-mix formulation, the ceramic articles can be rapidly and economically mass-produced in various shapes and sizes. The invention is especially adapted for use in fabricating preformed insulator components for electric lamp bases and similar devices and, in addition to reducing their manufacturing cost, recycles large quantities of scrap glass such as bottles and the like which would otherwise pollute the environment.
Inventors
- 👤 Walter A. Boyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:00
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/131; H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/085
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
A composition which forms a dense ceramic article when compressed and subsequently fired in air at a temature of about 1,000° C. for 10 minutes to 1 hour, said composition consisting essentially of; from about 25% to 45% by weight of clay, (b) from about 25% to 45% by weight of powdered glass that has a softening point below about 800° C., and (c) from about 10% to 25% by weight of a mineral selected from the group consisting of wollastonite, talc, petalite, potter's flint, and mixtures thereof.
Claim 2
Dependent Claim
88 words
A composition which forms a dense ceramic article when compressed and subsequently fired in air at a temature of about 1,000° C. for 10 minutes to 1 hour, said composition consisting essentially of; from about 25% to 45% by weight of clay, (b) from about 25% to 45% by weight of powdered glass that has a softening point below about 800° C., and (c) from about 10% to 25% by weight of a mineral selected from the group consisting of wollastonite, talc, petalite, potter's flint, and mixtures thereof.
Claim 3
Dependent Claim
20 words
The ceramic composition of claim 1 wherein up to 5% by weight of bentonite is also present in the raw-mix.
Claim 4
Dependent Claim
36 words
The ceramic composition of claim 1 wherein up to 5% by weight of an inorganic pigment selected from the group consisting of cobalt oxide, manganese oxide and iron oxide is also present in the raw mix.
Claim 5
Dependent Claim
49 words
The ceramic composition of claim 1 wherein; said mineral is wollastonite, and up to 5% by weight of bentonite and up to 5% by weight of an inorganic pigment selected from the group consisting of cobalt oxide, manganese oxide and iron oxide are also present in the raw mix.
Claim 6
Dependent Claim
94 words
A ceramic article of dense impervious structure consisting essentially of a composition (A) fired at a temperature of from about 800° to 1100°C. and (B), in its raw-mix state, consisting essentially of a. from about 10% to 25% by weight of a mineral selected from the group consisting of wollastonite, talc, petalite, potter's flint, and mixtures thereof; b. from about 25% to 45% by weight ball clay; and c. from about 25% to 45% by weight of a powdered glass selected from the group consisting of lime glass, lead glass and soda-lime silicate glass.
Claim 7
Dependent Claim
94 words
A ceramic article of dense impervious structure consisting essentially of a composition (A) fired at a temperature of from about 800° to 1100°C. and (B), in its raw-mix state, consisting essentially of a. from about 10% to 25% by weight of a mineral selected from the group consisting of wollastonite, talc, petalite, potter's flint, and mixtures thereof; b. from about 25% to 45% by weight ball clay; and c. from about 25% to 45% by weight of a powdered glass selected from the group consisting of lime glass, lead glass and soda-lime silicate glass.
Claim 8
Dependent Claim
22 words
The ceramic article of claim 5 wherein up to about 5% by weight of bentonite is also present in the raw mix.
Claim 9
Dependent Claim
35 words
The ceramic article of claim 6 wherein up to about 5% of an inorganic pigment selected from the group consisting of cobalt oxide, manganese oxide and iron oxide is also present in the raw mix.
Claim 10
Dependent Claim
60 words
A ceramic insulator for an electric lamp base or similar device consisting of a pressure-molded and fired mixture that consists essentially of from about 10% to 25% by weight of wollastonite, from about 25% to 45% by weight ball clay, and from about 25% to 45% by weight of a powdered glass that has a softening point below about 800°C.
Claim 11
Dependent Claim
60 words
A ceramic insulator for an electric lamp base or similar device consisting of a pressure-molded and fired mixture that consists essentially of from about 10% to 25% by weight of wollastonite, from about 25% to 45% by weight ball clay, and from about 25% to 45% by weight of a powdered glass that has a softening point below about 800°C.
Claim 12
Dependent Claim
25 words
The ceramic base insulator of claim 8 wherein said powdered glass consists essentially of soda-lime silicate glass which has a softening point of about 690°C.
Claim 13
Dependent Claim
22 words
The ceramic base insulator of claim 8 wherein up to about 5% by weight of bentonite is also present in said mixture.
Claim 14
Dependent Claim
25 words
The ceramic base insulator of claim 10 wherein said mixture has the following formulation:Constituent Percent by Weight______________________________________ball clay 40powdered soda-lime silicate glass 40wollastonite 16bentonite 4.______________________________________
References Cited (Backward Citations)
US2366473A
Cited
US2304562A
Cited
US2643020A
Cited
US2517019A
Cited
US2726963A
Cited
US2839414A
Cited
US3137657A
Cited
US3442993A
Cited
US3423217A
Cited
US3540894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |