US4556543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic honeycomb catalytic converters having high thermal shock resistance
Assignee: NGK Insulators Ltd
•
Filing: 1983-07-27
•
Granted: 1985-12-03
•
Expires: 2003-07-27
Abstract
Abstract A heat resistant and thermal shock resistant ceramic honeycomb catalytic converter for purifying automotive exhaust gas and the like is constructed by arranging at least one ceramic honeycomb structural body, having a dimension of 0.10</=L/D</=0.
Inventors
- 👤 Shigeru Mochida
- 👤 Masaru Kojima
- 👤 Jun Kitagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:37
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2839; F01N3/2853; F01N13/00; F01N13/009; F01N13/0097; F01N2330/00; F01N2330/06; F01N2350/00; F01N2350/02; F01N2350/04; F01N2350/06; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A thermal shock resistant ceramic honeycomb catalytic converter having a plurality of catalytic, serially disposed ceramic honeycomb structural bodies with a large number of parallel channels separated by thin walls, said plurality of bodies being positioned in a catalytic converter chamber such that at least one heat resistant ceramic honeycomb structural body selected from the group consisting of alumina, mullite, zirconia, zircon, spinel, alumina titanate, silicon carbide and silicon nitride, having a dimension 0.10≦L/D≦0.40 wherein L and D are a length and a diameter of the ceramic honeycomb structural body, respectively, is located upstream of all the remaining ceramic honeycomb structural bodies and imparts increased thermal shock resistance to the catalytic converter.
Claim 2
Dependent Claim
112 words
A thermal shock resistant ceramic honeycomb catalytic converter having a plurality of catalytic, serially disposed ceramic honeycomb structural bodies with a large number of parallel channels separated by thin walls, said plurality of bodies being positioned in a catalytic converter chamber such that at least one heat resistant ceramic honeycomb structural body selected from the group consisting of alumina, mullite, zirconia, zircon, spinel, alumina titanate, silicon carbide and silicon nitride, having a dimension 0.10≦L/D≦0.40 wherein L and D are a length and a diameter of the ceramic honeycomb structural body, respectively, is located upstream of all the remaining ceramic honeycomb structural bodies and imparts increased thermal shock resistance to the catalytic converter.
Claim 3
Dependent Claim
28 words
The thermal shock resistant ceramic honeycomb catalytic converter as claimed in claim 1, wherein the upstream ceramic honeycomb structural body abuts against the adjacent ceramic honeycomb structural body.
Claim 4
Dependent Claim
25 words
The thermal shock resistant ceramic honeycomb catalytic converter as claimed in claim 1, wherein the upstream ceramic honeycomb structural body has the dimension of 0.10≦L/D≦0.30.
Claim 5
Dependent Claim
28 words
The thermal shock resistant ceramic honeycomb catalytic converter as claimed in claim 3, wherein the upstream ceramic honeycomb structural body abuts against the adjacent ceramic honeycomb structural body.
Claim 6
Dependent Claim
20 words
The thermal shock resistant ceramic honeycomb catalytic converter as claimed in claim 1, having only two ceramic honeycomb structural bodies.
Claim 7
Dependent Claim
34 words
The thermal shock resistant ceramic honeycomb catalytic converter as claimed in claim 5, wherein a ratio of a length of said upstream structural body to a length of the other structural body is 10:90.
References Cited (Backward Citations)
US3397154A
Cited
US3441381A
Cited
US3828736A
Cited
US3785781A
Cited
US3967929A
Cited
US4021203A
Cited
US4134733A
Cited
US4072007A
Cited
US4348360A
Cited
US4416674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |