Conical filter

- Donaldson Company, Inc.
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Description

FIG. 1 shows a perspective view of an embodiment of a conical filter, according to the principles of the present invention;

FIG. 2 shows a side elevational view thereof, the other sides being identical to that shown;

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

FIG. 4 shows a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D342990 January 4, 1994 Jaroszczyk
1639133 August 1927 Greene
3112184 November 1963 Hollenbach
3807150 April 1974 Maracle
4039457 August 2, 1977 Schacht et al.
4157902 June 12, 1979 Tokar
4430223 February 7, 1984 Miyakawa et al.
4439321 March 27, 1984 Taki et al.
4782912 November 8, 1988 Wandless
4925561 May 15, 1990 Ishii et al.
4936413 June 26, 1990 Lee
5106397 April 21, 1992 Jaroszczyk et al.
5125940 June 30, 1992 Stanhope et al.
5320657 June 14, 1994 Adams
5458666 October 17, 1995 Miyakata
5522909 June 4, 1996 Haggard
5549722 August 27, 1996 Zemaitis et al.
5549724 August 27, 1996 Mochida
Foreign Patent Documents
152513 August 1985 EPX
Patent History
Patent number: D399944
Type: Grant
Filed: Apr 26, 1996
Date of Patent: Oct 20, 1998
Assignee: Donaldson Company, Inc. (Minneapolis, MN)
Inventors: Gary R. Gillingham (Prior Lake, MN), Wayne M. Wagner (Apple Valley, MN), Joseph C. Tokar (Apple Valley, MN), Daniel T. Risch (Burnsville, MN), Jim C. Rothman (Burnsville, MN), Steven A. Carter (Eagan, MN)
Primary Examiner: Lisa Lichtenstein
Law Firm: Merchant, Gould, Smith, Edell, Welter & Schmidt
Application Number: 0/53,683
Classifications
Current U.S. Class: Filter (D23/365)
International Classification: 2304;