Filter element having circular sleeve

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Description

FIG. 1 is a perspective view of a filter element having circular sleeve thereon;

FIG. 2 is a top plan view of FIG. 1, the bottom view being a mirror image;

FIG. 3 is a front side view of FIG. 1;

FIG. 4 is a back side view of FIG. 1;

FIG. 5 is a perspective view of a second embodiment of a filter element having circular sleeve thereon; different surfaces of the filter sleeve being indicated to contrast in appearance;

FIG. 6 is a top plan view of FIG. 5, the bottom plan view being a mirror image thereof; in FIG. 6 an outer surface of the filter sleeve being indicated to contrast in appearance with an inner surface of the filter sleeve;

FIG. 7 is a front side view of FIG. 5;

FIG. 8 is a back side view of FIG. 5;

FIG. 9 is a perspective view of a third embodiment of a filter element having a circular sleeve thereon, an outer surface of the sleeve being lined to indicate blue color;

FIG. 10 is a top plan view of FIG. 9 the bottom plan view being a mirror image thereof;

FIG. 11 is a front side view of FIG. 9; and,

FIG. 12 is a back side view of FIG. 9.

The broken lines in FIGS. 1-12 represent stitching.

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Patent History
Patent number: D407808
Type: Grant
Filed: Jul 11, 1996
Date of Patent: Apr 6, 1999
Assignee: Donaldson Company, Inc. (Minneapolis, MN)
Inventors: Larry R. Nepsund (Savage, MN), Kathleen A. Abrahamson (Prior Lake, MN), Thomas A. Boeckermann (Lakeville, MN), James K. Elfstrand (Mounds View, MN)
Primary Examiner: Lisa Lichtenstein
Law Firm: Merchant, Gould, Smith, Edell, Welter & Schmidt, P.A.
Application Number: 0/56,934
Classifications
Current U.S. Class: Filter (D23/365)
International Classification: 2304;