Fire preventing duct for passing cables and pipes through walls and bulkheads

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Description

FIG. 1 is a perspective view of a fire preventing duct for passing cables and pipes through walls and bulkheads showing our new design;

FIG. 2 is a front view thereof, the rear view, right side view and left side view corresponding to the front view; and,

FIG. 3 is a top view thereof, the bottom view corresponding to the top view .

Referenced Cited
U.S. Patent Documents
D395815 July 7, 1998 Walters et al.
3123879 March 1964 Boduroff et al.
4768024 August 30, 1988 Hauff
5027478 July 2, 1991 Suhr
Foreign Patent Documents
57583 June 1976 NLX
71614 June 1994 NOX
Patent History
Patent number: D428325
Type: Grant
Filed: Sep 9, 1998
Date of Patent: Jul 18, 2000
Inventors: Andre van Dreumel (3221 Sandefjord), Dagfinn Nilsen (3221 Sandefjord)
Primary Examiner: Holly Baynham
Law Firm: Ladas & Parry
Application Number: 0/93,321
Classifications
Current U.S. Class: D/8354
International Classification: 0805;