Appeal No. 1998-0215
Application No. 08/052,671
arcing or applied fire temperature above about 350 C. Thiso
position, however, is without merit.
We find that Pedlow states (column 2, lines 19-35 and 55-
60) that:
One primary difficulty of ordinary insulating tape
having a low melting resin base, such as polyvinyl
chloride plastisol, most conveniently used, and even
other low melting thermoplastics is that the resin melts
and flows away under the applied heat, and will not
therefore, protectively insulate the site where it is
needed. The present fireproofing tape, while using an
easy flowing and easily applied thermoplastic resinous
composition, includes a heat resistant fiber distributed
therein which both inhibits the resin from flowing away
from the site of high heat, but also includes
fireproofing and intumescing substances which foam and
release fireproofing vapors, so that both serve to
restrain the composition from flowing under heat. Under
the flaming or arcing heat it chars to a heat insulating
coating fixed protectively about the lead cable usually
to be protected.
. . . .
. . . . The insulating tape composition is
converted at the high arcing or applied fire temperatures
above about 350 C to a foamy charred residue of theo
thermoplastic resin, which remains as a protective
charred and foamy thick insulating coating upon the
cable.
The above-mentioned low melting thermoplastics include
polyethylene, polypropylene, and polyvinyl chloride. Compare
appellant’s preferred polypropylene resin in claim 3 with
12
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