Electricity: conductors and insulators – Boxes and housings – With electrical device
Reexamination Certificate
2007-03-20
2007-03-20
Patel, Dhiru R. (Department: 2831)
Electricity: conductors and insulators
Boxes and housings
With electrical device
C174S060000, C174S017070, C174S135000, C174S064000, C439S535000, C248S906000
Reexamination Certificate
active
11218000
ABSTRACT:
Fire Stop devices, for walls having cables that run through a wall opening, are provided on exposed ends of a conduit placed in the wall opening. Each fire stop device has a hollow housing fitted to the exposed end of the conduit, and a front wall of the housing has moveable cable clamping jaws to minimize the size of the slot through which the cables are provided. Intumescent material is provided inside the hollow housing. The rear wall of the housing has a separable back plate that contacts the conduit at only limited abutment surface to minimize heat transfer from the conduit to the housing. In a retro-fit version of the device the housing has a separable top and bottom housing portions.
REFERENCES:
patent: 2558610 (1951-06-01), Diekhoff
patent: 2599569 (1952-06-01), McLarty
patent: 2684994 (1954-07-01), Kwake
patent: 3676571 (1972-07-01), Rubinstein
patent: 4655422 (1987-04-01), Kelsall
patent: 6176052 (2001-01-01), Takahashi
patent: 6232553 (2001-05-01), Regen
patent: 6252167 (2001-06-01), Rose
patent: 6597275 (2003-07-01), Morrow et al.
patent: 2004/0093814 (2004-05-01), Cordts et al.
patent: 2819877 (2001-01-01), None
patent: 53067094 (1978-06-01), None
patent: WO2004/ 046597 (2004-03-01), None
Hemingway Jeffery
Takiff Brian
McCormick Paulding & Huber LLP
Patel Dhiru R.
The Wiremold Company
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