Diesel filter plugging process

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Plural sequential shaping or molding steps on same workpiece

Reexamination Certificate

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Details

C264S628000, C264S630000, C264S638000, C264S210100, C264S210300, C264S299000, C264SDIG048, C055S282200, C055S282300, C055S523000, C055SDIG007, C055SDIG010, C055SDIG030, C060S311000, C425S383000

Reexamination Certificate

active

07070728

ABSTRACT:
A method for plugging a subset of cells of a honeycomb structure having a plurality of open-end cells extending therethrough including providing at least one cylindrically-shaped first roller including an engagement surface having a plurality of outwardly-extending teeth spaced along a length and about a circumference of the at least one first roller, wherein the teeth are spaced so as to engage a first subset of a total number of cells exposed on a first end of the honeycomb structure. The method also includes rolling the engagement surface of the at least one first roller across the first end of the honeycomb structure with the teeth extending into the first subset of cells, thereby deforming the first end of the honeycomb structure and plugging a second subset of the total number of cells substantially different from the first subset of cells.

REFERENCES:
patent: 4283210 (1981-08-01), Mochida et al.
patent: 4411856 (1983-10-01), Montierth
patent: 6005143 (1999-12-01), Machado et al.
patent: 6863705 (2005-03-01), Ishihara et al.
patent: 2004/0206061 (2004-10-01), Ichikawa
patent: 2004/0206062 (2004-10-01), Ichikawa
patent: 0 042 300 (1984-04-01), None
patent: 0 226 306 (1991-05-01), None
patent: 0 692 995 (1997-07-01), None
patent: 0 692 995 (1997-07-01), None
patent: 2003-260316 (2003-09-01), None

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