US4435512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cordierite ceramic products
Assignee: Denso Corp
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Filing: 1981-11-24
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Granted: 1984-03-06
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Expires: 2001-11-24
Abstract
Abstract A process for producing a cordierite ceramic product comprises blending a starting cordierite composition which comprises: (a) a clay formulation having a cordierite composition comprising kaolin, talc and aluminium oxide and/or an aluminium compound which is convertible into aluminium oxide; (b) a glass having a cordierite composition; (c) an organic binder; and, (d) water.
Inventors
- 👤 Kazuyuki Ito
- 👤 Masami Ouki
- 👤 Naoto Miwa
- 👤 Osami Kamigaito
- 👤 Haruo Doi
- 👤 Yoshiharu Hirose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:17
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; B; B01; B01J; B01J37/00; B01J37/0009; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
In a process for producing a cordierite ceramic product comprising the steps of blending the starting cordierite composition, molding the blended composition, and drying and sintering the molded composition, the improvement comprising using as the starting cordierite composition a composition comprising: (a) a clay formulation having a cordierite composition comprising kaolin, talc, and aluminum oxide and/or an aluminum compound which is convertible into aluminum oxide; (b) a glass having a cordierite composition present in an amout of from about 10% to about 90% by weight, based on the total weight of said components (a) and (b); (c) from about 3% to about 8% by weight of an organic binder based upon the total weight of the starting cordierite composition; and (d) from about 18% to about 23% by weight of water based on the total weight of the starting cordierite composition.
Claim 2
Dependent Claim
141 words
In a process for producing a cordierite ceramic product comprising the steps of blending the starting cordierite composition, molding the blended composition, and drying and sintering the molded composition, the improvement comprising using as the starting cordierite composition a composition comprising: (a) a clay formulation having a cordierite composition comprising kaolin, talc, and aluminum oxide and/or an aluminum compound which is convertible into aluminum oxide; (b) a glass having a cordierite composition present in an amout of from about 10% to about 90% by weight, based on the total weight of said components (a) and (b); (c) from about 3% to about 8% by weight of an organic binder based upon the total weight of the starting cordierite composition; and (d) from about 18% to about 23% by weight of water based on the total weight of the starting cordierite composition.
Claim 3
Dependent Claim
34 words
The process according to claim 1 in which component (b), glass, is present in an amount from about 30% to 70% by weight, based on the total weight of said components (a) and (b).
Claim 4
Dependent Claim
101 words
The process according to claim 1 or 2 in which the molding is carried out by extrusion, the resulting cordierite ceramic product has a monolithic honeycomb structure, and the difference between the expansion coefficients of said cordierite ceramic product, measured over the range of from 25° C. to 1000° C., in three directions which are rectangular to each other, is less than 0.2×10 -6 /°C., said directions being a direction (A) of extrusion, a direction (B) in the thickness of the plane of one web of said honeycomb structure, and a direction (C) rectangular to both said directions (A) and (B).
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |