US4295892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cordierite ceramic honeycomb and a method for producing the same
Assignee: NGK Insulators Ltd
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Filing: 1978-12-20
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Granted: 1981-10-20
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Expires: 1998-12-20
Abstract
Abstract Cordierite ceramic honeycomb consisting mainly of cordierite in crystal phase and containing not more than 20% by weight of at least one crystal selected from the group consisting of spinel, mullite and corundum and having a thermal expansion coefficient at a temperature range of 25°-1,000° C. being less than 22×10 -7 (1/°C.).
Inventors
- 👤 Tadaaki Matsuhisa
- 👤 Shigeo Soejima
- 👤 Noboru Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
Cordierite ceramic honeycomb having a softening shrinkage at 1,450° C. of not more than 0.5% which consists mainly of cordierite in crystal phase and contains 8 to 20% by weight of at least one crystal selected from the group consisting of spinel, mullite and corundum has a thermal expansion coefficient at a temperature range of 25°-1,000° C. being not more than 22×10 -7 (1/°C.).
Claim 2
Dependent Claim
64 words
Cordierite ceramic honeycomb having a softening shrinkage at 1,450° C. of not more than 0.5% which consists mainly of cordierite in crystal phase and contains 8 to 20% by weight of at least one crystal selected from the group consisting of spinel, mullite and corundum has a thermal expansion coefficient at a temperature range of 25°-1,000° C. being not more than 22×10 -7 (1/°C.).
Claim 3
Dependent Claim
96 words
Cordierite ceramic honeycomb having a softening shrinkage at 1,450° C. of not more than 0.5% and having a melting temperature of not less than than 1,480° C., which consists mainly of cordierite in crystal phase and contains 8-20% by weight of at least one crystal selected from the group consisting of spinel, mullite and corundum, made from starting materials which chemically consisted of 43-51% by weight silica, 35-41% by weight alumina and 11-16%, by weight magnesia, and has a thermal expansion coefficient at a temperature range of 25°-1,000° C. of not more than 20×10 -7 (1/°C.).
Claim 4
Dependent Claim
96 words
Cordierite ceramic honeycomb having a softening shrinkage at 1,450° C. of not more than 0.5% and having a melting temperature of not less than than 1,480° C., which consists mainly of cordierite in crystal phase and contains 8-20% by weight of at least one crystal selected from the group consisting of spinel, mullite and corundum, made from starting materials which chemically consisted of 43-51% by weight silica, 35-41% by weight alumina and 11-16%, by weight magnesia, and has a thermal expansion coefficient at a temperature range of 25°-1,000° C. of not more than 20×10 -7 (1/°C.).
Claim 5
Dependent Claim
19 words
The cordierite ceramic honeycomb of claim 2, having a mean pore size in the range of 3-30 micron meters.
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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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |