Patent US4264660A successfully refreshed from Google Patents.
US4264660A
Expired / Lapsed
US
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Thermally insulated composite article
Assignee: Volkswagen AG
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Filing: 1976-10-19
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Granted: 1981-04-28
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Expires: 1996-10-19
Abstract
Abstract A thermally insulated article for conducting high temperature gases, such as exhaust gases from an internal combustion engine. The article comprises a core of ceramic material forming a flow passage and a metal jacket cast directly around the core. According to the invention, the ceramic core consists at least partially of a silicate fiber material.
Inventors
- 👤 Johann Siebels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:50
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/14; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N2310/00; F01N2310/06; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1317; Y10T428/25; Y10T428/256; Y10T428/257
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
In a thermally insulated article for conducting high temperature gases, such as internal combustion engine exhaust gases, the article comprising a core of ceramic material forming at least one flow channel and a metal jacket, surrounding the core and cast directly thereon, the improvement wherein the ceramic core consists of a mixture which is sintered at temperatures of 1200°-1550° C., said mixture comprising 30-60% by volume aluminum oxide (Al 2 O 3 ) powder and 70-40% by volume alumina silicate fibers.
Claim 2
Dependent Claim
81 words
In a thermally insulated article for conducting high temperature gases, such as internal combustion engine exhaust gases, the article comprising a core of ceramic material forming at least one flow channel and a metal jacket, surrounding the core and cast directly thereon, the improvement wherein the ceramic core consists of a mixture which is sintered at temperatures of 1200°-1550° C., said mixture comprising 30-60% by volume aluminum oxide (Al 2 O 3 ) powder and 70-40% by volume alumina silicate fibers.
Claim 3
Dependent Claim
27 words
The article defined in claim 1, wherein the mixture of aluminum oxide powder and alumina silicate fibers includes an additive of 5-20% by weight of zirconium silicate.
Claim 4
Dependent Claim
13 words
The article defined in claim 1, wherein the mixture includes catalytically active additives.
Claim 5
Dependent Claim
22 words
The article defined in claim 1, wherein the ceramic core has an erosion resistant layer on the internal flow channel-forming surfaces thereof.
Claim 6
Dependent Claim
22 words
The article defined in claim 1, wherein the ceramic core has a catalytically active layer on the internal flow channel-forming surfaces thereof.
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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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |