Safety filter element

- Donaldson Company, Inc.
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Description

FIG. 1 is a top plan view of a safety filter element embodying our new design;

FIG. 2 is a bottom plan view of the safety filter element depicted in FIG. 1;

FIG. 3 is a front side elevational view of the safety filter element depicted in FIG. 1;

FIG. 4 is a back side elevational view of the safety filter element depicted in FIG. 4;

FIG. 5 is a left side elevational view of the safety filter element depicted in FIG. 1; and,

FIG. 6 is a right side elevational view of the safety filter element depicted in FIG. 1.

Referenced Cited
U.S. Patent Documents
D401306 November 17, 1998 Ward et al.
D404797 January 26, 1999 Jameson
3469707 September 1969 Humbert, Jr. et al.
3698562 October 1972 Farrow et al.
4801383 January 31, 1989 Haffmann et al.
5082476 January 21, 1992 Kahlbaugh et al.
5336405 August 9, 1994 Tang et al.
5443721 August 22, 1995 Kelada et al.
5613992 March 25, 1997 Engel
5728298 March 17, 1998 Hamlin
Other references
  • Exhibit A, Photographs of a prior art safety filter element (2 pages, 4 photographs).
Patent History
Patent number: D416308
Type: Grant
Filed: Jul 24, 1998
Date of Patent: Nov 9, 1999
Assignee: Donaldson Company, Inc. (Minneapolis, MN)
Inventors: Dennis E. Ward (Richfield, MN), Kevin J. Schrage (Spring Valley, MN), Paul R. Coulonvaux (Brussels), Johan G. Dewit (Hamme-Mille), Jeffrey J. Ivarson (San Rafael, CA)
Primary Examiner: Robin V. Taylor
Law Firm: Merchant & Gould P.C.
Application Number: 0/91,239
Classifications
Current U.S. Class: Filter Or Strainer (2) (D23/209)
International Classification: 2301;