Filter unit

- PPM, Inc.
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Description

FIG. 1 is a perspective view of a filter unit of my new appearance design as it appears in operation suspended from overhead and with filter media in place;

FIG. 2 is an additional perspective view of the filter unit of FIG. 1 showing the bottom, rear and opposite sides not visible in FIG. 1; and

FIG. 3 is a perspective view from the same orientation as FIG. 1, but showing the appearance of the filter unit with the filter media and rolls removed.

Referenced Cited
U.S. Patent Documents
D147357 August 1947 Watkins
D204722 May 1966 Jenner
D238296 December 1975 Trimarchi
D248869 August 8, 1978 Risher
D258686 March 24, 1981 Johnson
2763139 September 1956 Callan et al.
2887567 May 1959 Dameral
3596442 August 1971 Neumann
3745750 July 1973 Arff
3861894 January 1975 Marsh
3954427 May 4, 1976 Jenn
4011067 March 8, 1977 Carey, Jr.
4226715 October 7, 1980 Niederer et al.
4277255 July 7, 1981 Apelgren
4301095 November 17, 1981 Mettler et al.
4370155 January 25, 1983 Armbruster
4378980 April 5, 1983 Long
Foreign Patent Documents
2717613 November 1977 DEX
939098 June 1982 DEX
2800703 July 1978 SUX
Other references
  • Modufil.TM. Sales Brochure No. 107-10/82 (Oct. 1982) prepared by Assignee, ppm, Inc., Knoxville, TN. Modufil.TM. Sales Brochure No. 112-2/83 (Feb. 1983) prepared by Assignee, ppm, Inc., Knoxville, TN. Modufil.TM. Sales Brochure No. 113-3/83 (Mar. 1983) prepared by Assignee, ppm, Inc., Knoxville, TN. Sales Brochure, Northern Air Corporation, "Modular Air Filtration Systems Model AR-2000" (exact date unknown).
Patent History
Patent number: D282767
Type: Grant
Filed: Apr 6, 1982
Date of Patent: Feb 25, 1986
Assignee: PPM, Inc. (Knoxville, TN)
Inventor: Frederick M. Shofner (Knoxville, TN)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Lynn Wilder
Law Firm: Kerkam, Stowell, Kondracki & Clarke
Application Number: 6/365,892
Classifications
Current U.S. Class: D23/4