Damper unit

- Energy Vent, Inc.
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Description

FIG. 1 is a perspective view of the damper unit showing our new design.

FIG. 2 is a top plan view thereof.

FIG. 3 is a bottom plan view thereof.

FIG. 4 is an end elevational view thereof, the opposite end being a mirror image of the end shown.

FIG. 5 is a left side elevational view thereof.

FIG. 6 is a right side elevational view thereof.

Referenced Cited
U.S. Patent Documents
D268281 March 15, 1983 Prikkel
1337904 April 1920 Hall
1659875 February 1928 Jacobs
2959933 November 1960 Burke
2975975 March 1961 Weber
3273798 September 1966 Kuiper
3366333 January 1968 Diehl
3753548 August 1973 Jung et al.
3804366 April 1974 Rubright
4165833 August 28, 1979 Nagel
4290552 September 22, 1981 Prikkel
4361272 November 30, 1982 Prikkel et al.
Patent History
Patent number: D271615
Type: Grant
Filed: Apr 6, 1981
Date of Patent: Nov 29, 1983
Assignee: Energy Vent, Inc. (Dayton, OH)
Inventors: John Prikkel, III (Dayton, OH), Dale R. Booher (Fairborn, OH), Jeffrey R. Killin (Fairborn, OH)
Primary Examiner: James R. Largen
Law Firm: Dybvig & Dybvig
Application Number: 6/251,207
Classifications
Current U.S. Class: D23/127
International Classification: D2303;