Duct

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Description

FIG. 1 is a perspective view of a duct showing my design;

FIG. 2 is a side elevational view thereof, the other sides being identical to that shown; and,

FIG. 3 is an end view thereof, the opposite end being a mirror image of that shown.

Referenced Cited
U.S. Patent Documents
D307174 April 10, 1990 Bjorkman et al.
D371189 June 25, 1996 Dharamsi et al.
4296157 October 20, 1981 Conte
Other references
  • VSL Corporation, VSL Post-Tensioning Systems, Mar. 1994, pp. 1-30.
Patent History
Patent number: D400670
Type: Grant
Filed: Apr 25, 1996
Date of Patent: Nov 3, 1998
Inventor: Felix L. Sorkin (Stafford, TX)
Primary Examiner: Lisa Lichtenstein
Application Number: 0/53,607
Classifications
Current U.S. Class: Vent, Ductwork, Or Element Thereof (D23/393); Pipe, Tubing Or Hose (D23/266)
International Classification: 2301;