Combined filter element and frame therefor
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FIG. 1 shows a perspective view of a first embodiment of a filter apparatus, according to the present invention;
FIG. 2 shows a top plan view thereof, a bottom plan view not being shown as it is a mirror image of the top plan view;
FIG. 3 shows a front elevational view thereof, a rear elevational view not being shown as it is a mirror image of the front elevational view;
FIG. 4 shows a right side elevational view thereof, a left side elevational view not being shown as it is a mirror image of the right side elevational view;
FIG. 5 shows a perspective view of a second embodiment of a filter apparatus, according to the principles of the present invention;
FIG. 6 shows a top plan view thereof, a bottom plan view not being shown as it is a mirror image of the top plan view;
FIG. 7 shows a front elevational view thereof, a rear elevational view not being shown as it is a mirror image of the front elevational view; and,
FIG. 8 shows a right side elevational view thereof, a left side elevational view not being shown as it is a mirror image of the right side elevational view.
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Type: Grant
Filed: Apr 26, 1996
Date of Patent: Sep 8, 1998
Assignee: Donaldson Company, Inc. (Minneapolis, MN)
Inventors: Gary R. Gillingham (Prior Lake, MN), Bernard A. Matthys (Apple Valley, MN), Joseph C. Tokar (Apple Valley, MN), Daniel T. Risch (Burnsville, MN)
Primary Examiner: Lisa Lichtenstein
Law Firm: Merchant, Gould, Smith, Edell, Welter & Schmidt
Application Number: 0/53,682
