Restriction indicator

- Donaldson Company, Inc.
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Description

FIG. 1 is a perspective view of a restriction indicator according to the present invention;

FIG. 2 is a top plan view of the restriction indicator shown in FIG. 1;

FIG. 3 is a side elevational view of the restriction indicator shown in FIG. 1; and,

FIG. 4 is a bottom plan view of the restriction indicator shown in FIG. 1.

Referenced Cited
U.S. Patent Documents
3939457 February 17, 1976 Nelson
4020783 May 3, 1977 Anderson et al.
4031847 June 28, 1977 Sullivan
4254731 March 10, 1981 Taylor
4445456 May 1, 1984 Nelson
Patent History
Patent number: D378744
Type: Grant
Filed: Jan 11, 1996
Date of Patent: Apr 8, 1997
Assignee: Donaldson Company, Inc. (Minneapolis, MN)
Inventors: Kathleen A. Abrahamson (Prior Lake, MN), Thomas A. Boeckemann (Lakeville, MN), James Efstrand (Moundsview, MN)
Primary Examiner: Antoine Duval Davis
Law Firm: Merchant, Gould, Smith, Welter, Edell & Schmidt
Application Number: 0/48,653