Conical filter

- Donaldson Company, Inc.
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Description

FIG. 1 shows a perspective view of a conical filter showing our new design;

FIG. 2 shows a side elevational view thereof, the other sides being indentical 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 Jaroszcyk
1639133 August 1927 Greene
2552615 May 1951 Baltzer
2558185 June 1951 Leisen
3112184 November 1963 Hollenbach
3738088 June 1973 Colosimo
3807150 April 1974 Maracle
4039457 August 2, 1977 Schacht et al.
4157902 June 12, 1979 Tokar
4199387 April 22, 1980 Hladik
4430223 February 7, 1984 Miyakawa et al.
4439321 March 27, 1984 Taki et al.
4589983 May 20, 1986 Wydevan
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
703823 February 1954 GBX
Patent History
Patent number: D428128
Type: Grant
Filed: Apr 30, 1998
Date of Patent: Jul 11, 2000
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 P.C.
Application Number: 0/87,358
Classifications
Current U.S. Class: Filter (D23/365)
International Classification: 2304;