US3876556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust catalyst carrier of aluminum oxide honeycomb structure having an outer shell of aluminum phosphate
Assignee: Feldmuehle Anlagen und Produktion GmbH
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Filing: 1973-12-26
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Granted: 1975-04-08
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Expires: 1993-12-26
Abstract
Abstract The radial and axial compressive strength of an approximately cylindrical talyst carrier, for automotive exhaust gases which is a honeycomb structure of thin aluminum oxide walls bounding axial conduits, is greatly enhanced by an outer shell of cured aluminum phosphate cement even if the latter is only one millimeter thick. The resistance of the carrier to thermal shock is improved if the wall of the shell spacedly envelops the outer axial face of the honeycomb core, and the annular gap is at least partly occupied by ceramic fibers which provide thermal insulation.
Inventors
- 👤 Erich Laack
- 👤 Ulf Dworak
- 👤 Gerhard Thamarus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:55
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J35/00; B01J35/50; B01J35/56; B01J35/57; B01J37/00; B01J37/0009; B01J37/0018; B32; B32B; B32B3/00; B32B3/26; B32B3/28; C; C04; C04B; C04B38/00; C04B38/008; C04B38/0083; F01N3/2835; B32B2305/00; B32B2305/80; F01N2330/00; F01N2330/06; F01N2330/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
A RIGID CATALYST CARRIER ESSENTIALLY CONSISTING OF A CORE AND OF AN OUTER SHELL, A. SAID CORE CONSISTING OF CERAMIC WALLS INTEGRALLY BONDED IN A HONEYCOMB STRUCTURE ALONG NODES ELONGATED IN A COMMON DIRECTION, SAID WALLS BOUNDING CONTINUOUS CONDUITS ELONGATED IN SAID DIRECTION AND ESSENTIALLY CONSISTING OF SINTERED ALUMINUM OXIDE PARTICLES, THE THICKNESS OF SAID WALLS AND OF SAID NODES BEING NOT GREATER THAN 0.5 MILLIMETER, SAID CORE HAVE AN AXIS EXTENDING IN SAID DIRECTION AND BEING OF ARCUATE CROSS SECTION IN A PLANE PERPENDICULAR TO SAID AXIS; B. SAID SHELL EXTENDING ABOUT SAID AXIS IN A CLOSED LOOP AND ENVELOPING SAID CORE, SAID SHELL ESSENTIALLY CONSISTING OF ALUMINUM PHOSPHATE AND BEING OF A THICKNESS SUFFICIENT TO ENHANCE THE RADIAL COMPRESSIVE STRENGTH OF SAID CORE BY AT LEAST 100 PERCENT.
Claim 2
Dependent Claim
130 words
A RIGID CATALYST CARRIER ESSENTIALLY CONSISTING OF A CORE AND OF AN OUTER SHELL, A. SAID CORE CONSISTING OF CERAMIC WALLS INTEGRALLY BONDED IN A HONEYCOMB STRUCTURE ALONG NODES ELONGATED IN A COMMON DIRECTION, SAID WALLS BOUNDING CONTINUOUS CONDUITS ELONGATED IN SAID DIRECTION AND ESSENTIALLY CONSISTING OF SINTERED ALUMINUM OXIDE PARTICLES, THE THICKNESS OF SAID WALLS AND OF SAID NODES BEING NOT GREATER THAN 0.5 MILLIMETER, SAID CORE HAVE AN AXIS EXTENDING IN SAID DIRECTION AND BEING OF ARCUATE CROSS SECTION IN A PLANE PERPENDICULAR TO SAID AXIS; B. SAID SHELL EXTENDING ABOUT SAID AXIS IN A CLOSED LOOP AND ENVELOPING SAID CORE, SAID SHELL ESSENTIALLY CONSISTING OF ALUMINUM PHOSPHATE AND BEING OF A THICKNESS SUFFICIENT TO ENHANCE THE RADIAL COMPRESSIVE STRENGTH OF SAID CORE BY AT LEAST 100 PERCENT.
Claim 3
Dependent Claim
21 words
A carrier as set forth in claim 1, wherein said shell engages said core in area contact in said closed loop.
Claim 4
Dependent Claim
38 words
A carrier as set forth in claim 1, wherein said core has an outer axial face extending about said axis in an arc of 360.degree., and said shell covers said outer face in direct contact over said arc.
Claim 5
Dependent Claim
56 words
A carrier as set forth in claim 1, wherein said core has an outer axial face of arcuate cross section, and said shell has a tubular wall portion spacedly enveloping said outer face, whereby said wall portion and said outer face bound therebetween an annular gap, and a multiplicity of elongated ceramic fibers in said gap.
Claim 6
Dependent Claim
23 words
A carrier as set forth in claim 4, wherein said fibers occupy not more than 50 percent of the volume of said gap.
Claim 7
Dependent Claim
17 words
A carrier as set forth in claim 5, wherein said fibers are partly embedded in said shell.
Claim 8
Dependent Claim
24 words
A carrier as set forth in claim 4, wherein said shell has axially terminal portions engaging said outer face and axially bounding said gap.
Claim 9
Dependent Claim
20 words
A carrier as set forth in claim 1, wherein said thickness of said shell is not greater than 2 millimeter.
Claim 10
Dependent Claim
18 words
A carrier as set forth in claim 1, wherein said thickness of said shell is approximately 1 millimeter.
References Cited (Backward Citations)
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |