Air filtration unit

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Description

FIG. 1 is a rear perspective view of an air filtration unit, showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof; and

FIG. 7 is a top plan view thereof.

Referenced Cited
U.S. Patent Documents
D254566 March 25, 1980 Cummins
D282101 January 7, 1986 Yuen
965783 July 1910 Wiedemann et al.
1779201 July 1927 Wickstrom
2855641 October 1958 Stein
2994405 August 1961 Barach et al.
3278114 October 1966 Gibbs
3438180 April 1969 Klouda
3616624 November 1971 Marsh
3672126 June 1972 Goettle
3750370 August 1973 Brauss et al.
3930818 January 6, 1976 McDougall
3936284 February 3, 1976 Mason
4047913 September 13, 1977 Okumura
4121916 October 24, 1978 Fricke
4252547 February 24, 1981 Johnson
4604111 August 5, 1986 Natale
4613348 September 23, 1986 Natale
Other references
  • Rodale's New Shelter Magazine reprint, .COPYRGT.1982, p. 48:18, Cleanaire 1212, top left side of page. Brochure-Nilfisk, 11-86.
Patent History
Patent number: D311270
Type: Grant
Filed: Sep 10, 1987
Date of Patent: Oct 16, 1990
Assignee: Crystal Clear Air, Inc. (Seattle, WA)
Inventors: James J. Savage (Seattle, WA), James A. Walsh (Seattle, WA)
Primary Examiner: James M. Gandy
Assistant Examiner: Lisa Lichtenstein
Law Firm: Seed and Berry
Application Number: 7/95,476
Classifications
Current U.S. Class: Filter (D23/365)