US4233351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic honeycomb structure
Assignee: Soken Inc
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Filing: 1979-05-15
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Granted: 1980-11-11
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Expires: 1999-05-15
Abstract
Abstract A ceramic honeycomb structure is provided with a plurality of open passages extending therethrough in an axial direction thereof. The wall thickness of at least one part of the open passages formed in an annular portion along an outer peripheral surface of the structure is made larger than that of the other open passages formed in the other portion than the annular portion, and the structure has excellent mechanical strength and thermal shock strength.
Inventors
- 👤 Kazunari Okumura
- 👤 Shinichi Yamamoto
- 👤 Zituo Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:14
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2825; F01N3/2828; C; C04; C04B; C04B38/00; C04B38/0006; F28; F28F; F28F21/00; F28F21/04; B; B01; B01J; B01J35/00; B01J35/50; B01J35/56; F01N2330/00; F01N2330/06; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24744; Y10T428/24777
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
30 words
In a ceramic honeycomb structure provided with a plurality of open passages extending therethrough in an axial direction thereof and defined by thin walls of said structure the improvement wherein:
Claim 2
Dependent Claim
30 words
In a ceramic honeycomb structure provided with a plurality of open passages extending therethrough in an axial direction thereof and defined by thin walls of said structure the improvement wherein:
Claim 3
Dependent Claim
49 words
the wall thickness of at least one part of walls of said structure which define said open passages formed in an annular portion along an outer peripheral surface of said structure is formed larger than that of the other open passages formed in portions other than said annular portion.
Claim 4
Dependent Claim
49 words
the wall thickness of at least one part of walls of said structure which define said open passages formed in an annular portion along an outer peripheral surface of said structure is formed larger than that of the other open passages formed in portions other than said annular portion.
Claim 5
Dependent Claim
24 words
A ceramic honeycomb structure according to claim 1 wherein: said outer peripheral surface of said structure is formed into a roughened surface having projections.
Claim 6
Dependent Claim
49 words
A ceramic honeycomb structure according to claim 2, wherein: the wall thickness of all of said open passages formed in said annular portion is formed larger than that of the other open passages for a predetermined number of rows of open passages along a radial direction of said structure.
Claim 7
Dependent Claim
39 words
A ceramic honeycomb structure according to claim 3, wherein: the wall thickness of all of said open passages formed in said annular portion is increased continuously along a radial direction of said structure toward said outer peripheral surface thereof.
Claim 8
Dependent Claim
40 words
A ceramic honeycomb structure according to claim 3, wherein: the wall thickness of all of said open passages formed in said annular portion is increased by stages along a radial direction of said structure toward said outer peripheral surface thereof.
Claim 9
Dependent Claim
57 words
A ceramic honeycomb structure according to claim 2, wherein: said open passages have a regular square cross section and the wall thickness of said open passages which are positioned along diagonal lines passing through the center of said structure in said annular portion and said other portions is formed larger than that of the other open passages.
References Cited (Backward Citations)
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US3899326A
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US3887741A
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US3983283A
Cited
US4042738A
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US4072007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |