US4753919A
Expired / Lapsed
US
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Method for optimizing stacking characteristics of corrugated metal foil
Assignee: BASF Catalysts LLC
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Filing: 1987-03-23
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Granted: 1988-06-28
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Expires: 2007-03-23
Abstract
Abstract There is provided a method for optimizing the stacking characteristics of a thin metal foil corrugated in a chevron pattern and folded in an accordion fashion or zig-zag manner to form a stack useful as a catalyst support member for catalytic converters for treating exhaust gases from internal combustion engines. This method provides a more stable and stronger stack.
Inventors
- 👤 William A. Whittenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:03
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2807; F01N3/281; F01N3/2814; B; B01; B01J; B01J35/00; B01J35/50; B01J35/56; F01N2330/00; F01N2330/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
71 words
A method for optimizing the number of contact points, n, between confronting surfaces of metal foil corrugated in a chevron pattern and folded in an accordian fashion to form a stack useful as a catalyst support element which comprises dimensioning the pitch of the chevrons, p, and the angle of the chevrons, alpha, and determining L, which is the length of each chevron from apex to apex, from the equation: ##EQU6##
Claim 2
Independent Claim
71 words
A method for optimizing the number of contact points, n, between confronting surfaces of metal foil corrugated in a chevron pattern and folded in an accordian fashion to form a stack useful as a catalyst support element which comprises dimensioning the pitch of the chevrons, p, and the angle of the chevrons, alpha, and determining L, which is the length of each chevron from apex to apex, from the equation: ##EQU6##
Claim 3
Dependent Claim
13 words
A method as defined in claim 1 wherein n is 3 or less.
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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |