Patent US4752599A successfully refreshed from Google Patents.
US4752599A
Expired / Lapsed
US
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Method for producing a base of a catalyst carrier for automobile exhaust gas-purification
Assignee: Nippon Steel Corp
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Filing: 1987-03-27
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Granted: 1988-06-21
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Expires: 2007-03-27
Abstract
Abstract In a carrier for a catalyst for purifying exhaust gas, a honeycomb is formed by coiling a corrugated sheet and a flat sheet together, and is mounted in an outer cylinder. An Al (alloy)-clad foil or hot-dip Al (alloy) galvanized foil is used to form the honeycomb, which is heat treated in a vacuum or a reducing atmosphere to simultaneously bond the corrugated sheet and flat sheet together and also bond the honeycomb to the outer cylinder, and to diffuse Al into the foil.
Inventors
- 👤 Yasushi Nakamura
- 👤 Mikio Yamanaka
- 👤 Keiichi Ohmura
- 👤 Motohiko Arakawa
- 👤 Toshiyuki Yashiro
- 👤 Masaki Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:39
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J37/00; B01J37/02; B01J37/0215; B01J37/0225; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A method for producing a base, on which a catalyst carrier for purifying exhaust gas is deposited, comprising the steps of: preparing a stainless-steel sheet; forming a layer of Al or Al-alloy on one or both surfaces of the stainless-steel sheet; rolling the stainless-steel sheet having the layer of Al or Al-alloy thereon to thereby form a composite foil; shaping one part of said composite foil into a corrugated sheet, while leaving the other part thereof in a form of a flat sheet; producing a honeycomb structure by assembling the corrugated sheet and the flat sheet; mounting the honeycomb in an outer cylinder made of heat-resistant steel and; heat treating said mounted honeycomb and outer cylinder in vacuum or a reducing atmosphere at a temperature of from 600° to 1300° C.
Claim 2
Independent Claim
131 words
A method for producing a base, on which a catalyst carrier for purifying exhaust gas is deposited, comprising the steps of: preparing a stainless-steel sheet; forming a layer of Al or Al-alloy on one or both surfaces of the stainless-steel sheet; rolling the stainless-steel sheet having the layer of Al or Al-alloy thereon to thereby form a composite foil; shaping one part of said composite foil into a corrugated sheet, while leaving the other part thereof in a form of a flat sheet; producing a honeycomb structure by assembling the corrugated sheet and the flat sheet; mounting the honeycomb in an outer cylinder made of heat-resistant steel and; heat treating said mounted honeycomb and outer cylinder in vacuum or a reducing atmosphere at a temperature of from 600° to 1300° C.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein the stainless-steel sheet to be provided with the Al or Al-alloy layer thereon, is an Al-containing stainless steel strip.
Claim 4
Dependent Claim
17 words
A method according to claim 1, wherein the layer of Al or Al-alloy is a foil layer.
Claim 5
Dependent Claim
22 words
A method according to claim 1, wherein the layer of Al or Al-alloy is a hot-dip plating layer of Al or Al-alloy.
Claim 6
Dependent Claim
19 words
A method according to claim 1, wherein the Al-alloy contains one or more of Mn, Mg, Si, and Cu.
Claim 7
Dependent Claim
17 words
A method according to claim 2, wherein the layer of Al or Al-alloy is a foil layer.
Claim 8
Dependent Claim
22 words
A method according to claim 2, wherein the layer of Al or Al-alloy is a hit-dip plating layer of Al or Al-alloy.
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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |