US4125408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low thermal expansion ceramic composition
Assignee: Individual
•
Filing: 1976-10-28
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Granted: 1978-11-14
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Expires: 1996-10-28
Abstract
Abstract A ceramic composition composed of a hydrothermal, high magnesium, plastic clay combined with suitable sources of MgO, SiO 2 , and Al 2 O 3 to result in a composition, the fired product of which results in a cordierite ceramic having low coefficient of thermal expansion characteristics that permit the use of said ceramic in flameware cooking utensils. For a similar cordierite like composition the mineral tremolite can be included in the composition to enhance moist workability and drying and firing dimension stability.
Inventors
- 👤 Paul S. Pieper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A composition of matter consisting essentially of from 20% to 75% by weight of a hydrothermal high magnesium plastic clay containing about 9-20% MgO intimately mixed with a conventional source of Al 2 O 3 and SiO 2 and 5% to 20% of crystalline tremolite, at least some being in a ground lath-like form, said constituents supplied in amounts to approximate the stoichiometric proportions of a cordierite-like ceramic, the CaO content of said tremolite contributing diadochically for part of the MgO in said ceramic, said composition having the capability of being fired at below 1300° C. to produce said cordierite-like ceramic of low thermal expansion characteristics.
Claim 2
Dependent Claim
106 words
A composition of matter consisting essentially of from 20% to 75% by weight of a hydrothermal high magnesium plastic clay containing about 9-20% MgO intimately mixed with a conventional source of Al 2 O 3 and SiO 2 and 5% to 20% of crystalline tremolite, at least some being in a ground lath-like form, said constituents supplied in amounts to approximate the stoichiometric proportions of a cordierite-like ceramic, the CaO content of said tremolite contributing diadochically for part of the MgO in said ceramic, said composition having the capability of being fired at below 1300° C. to produce said cordierite-like ceramic of low thermal expansion characteristics.
Claim 3
Dependent Claim
103 words
A composition of matter consisting essentially of from 25% to 60% by weight of saponite, said saponite being intimately mixed with at least one conventional source of Al 2 O 3 and SiO 2 and 5% to 20% of crystalline tremolite, at least some being in a ground lath-like form, said constituents being supplied in amounts to approximate the stoichiometric proportions of a cordierite-like ceramic, the CaO content of said tremolite contributing diadochically for part of the MgO in said ceramic, said composition having the capability of being fired at below 1300° C. to produce said cordierite-like ceramic of low thermal expansion characteristics.
Claim 4
Dependent Claim
103 words
A composition of matter consisting essentially of from 25% to 60% by weight of saponite, said saponite being intimately mixed with at least one conventional source of Al 2 O 3 and SiO 2 and 5% to 20% of crystalline tremolite, at least some being in a ground lath-like form, said constituents being supplied in amounts to approximate the stoichiometric proportions of a cordierite-like ceramic, the CaO content of said tremolite contributing diadochically for part of the MgO in said ceramic, said composition having the capability of being fired at below 1300° C. to produce said cordierite-like ceramic of low thermal expansion characteristics.
Claim 5
Dependent Claim
34 words
A composition of matter according to claim 2, wherein said constituents are intimately mixed in suitable proportions, said mixture being pre-fired and ground to suitable mesh to optimize intimate mixing in said stoichiometric proportions.
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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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |