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US 5,174,969 AGranted
Roll-pack diesel particulate filter
AssigneeMinnesota Mining and Manufacturing Company
InventorsEdward M. Fischer, Donald D. Johnson, Stephen M. Sanocki
Life of this patent
Estimating the term…
Abstract
An efficient, economical, compact diesel particulate filter comprising a casing radially filled with a bundle of tubes comprising woven, braided, or knitted inorganic yarn, wherein each tube is at least about twice the length of the bundle, and is folded at one end to prevent exhaust from traveling through the hollow of the tube without passing through its wall.
Claims52
A diesel particulate filter comprising
- (a) a casing having an inlet end and an outlet end;
- (b) means for connecting said ends of said casing to an exhaust system;
- and
- (c) a filtering element substantially radially filling said casing, said filtering element comprising
- (i) a plurality of parallel, hollow tubes, each tube comprising one of woven, braided, or knitted inorganic yarn, said tubes extending between said ends of said casing in layers, said tubes being open at one of said inlet and said outlet end of said casing, and said tubes being integral in pairs by means of a fold;
- and
- (ii) means for restricting flow of exhaust along channels between adjacent ones of said parallel tubes and between said filtering element and said casing.
4 more elements
A diesel particulate filter comprising
- (a) a casing having an inlet end and an outlet end;
- (b) means for connecting said ends of said casing to an exhaust system;
- and
- (c) a filtering element substantially radially filling said casing, said filtering element comprising
- (i) a continuous hollow tube comprising one of woven, braided, or knitted inorganic yarn, said tube being folded in a zig-zag pattern to provide a layer comprising a plurality of parallel tube segments, wherein ends of said tube segments are defined by folds, said layer being spirally wound such that said ends of said tube segments extend between said ends of said casing, and
- (ii) means for restricting flow of exhaust along channels between adjacent ones of said parallel tube segments and between said filtering element and said casing.
3 more elements
A diesel particulate filter comprising
- (a) a casing having an inlet end and an outlet end;
- (b) means for connecting said ends of said casing to an exhaust system;
- and
- (c) a filtering element substantially radially filling said casing, said filtering element comprising
- (i) a plurality of parallel, hollow tubes, each tube comprising one of woven braided, or knitted inorganic yarn, said tubes extending between said ends of said casing in layers, said tubes being open at one of said inlet and said outlet end of said casing, and said tubes being blocked at one of said outlet end and said inlet end of said casing;
- and
- (ii) means for restricting flow of exhaust along channels between adjacent ones of said parallel tubes and between said filtering element and said casing, wherein said means for restricting flow provides filtration of exhaust.
4 more elements
Dependencies are inferred from the claim text.