Combined filter element and frame therefor

- Donaldson Company, Inc.
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Description

FIG. 1 shows a perspective view of a combined filter element and frame therefor according to the principles of the present invention;

FIG. 2 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. 3 shows a top plan view thereof; and,

FIG. 4 shows a right side elevational view, a left side elevational view not being shown as it is a mirror image of the right side elevational view .

Referenced Cited
U.S. Patent Documents
3807150 April 1974 Maracle
3878594 April 1975 Minor, Jr. et al.
3966646 June 29, 1976 Noakes et al.
4289513 September 15, 1981 Brownhill et al.
4322231 March 30, 1982 Hilzendeger et al.
4410427 October 18, 1983 Wydeven
4430223 February 7, 1984 Miyakawa et al.
4439231 March 27, 1984 Taki et al.
4589983 May 20, 1986 Wydevan
5102436 April 7, 1992 Grabowski
5304351 April 19, 1994 Tanaka et al.
Patent History
Patent number: D425189
Type: Grant
Filed: Apr 6, 1998
Date of Patent: May 16, 2000
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 P.C.
Application Number: 0/88,181
Classifications
Current U.S. Class: Filter (D23/365); Air Treatment (D23/355)
International Classification: 2304;