Appeal No. 2006-1308
Application No. 10/269,974
one portion of a building to another and that, upon occurrence of a conflagration,
the fire is readily transmitted through such ducts (p. 1, col. 1, ll. 7-24). According
to Lamb, the primary purpose of his invention
is to provide a screen which may be located at any
desired position in a duct or in a wall opening and which
being of reticulated or foraminous construction will
permit a substantially unobstructed flow of air at normal
temperatures but which when subjected to temperatures
slightly above 212o F. will become heat activated so as to
automatically become converted into an imperforate,
non-flammable screen which will positively prohibit the
passage of flame or excessively hot air or the
transmission of conflagration [p. 1, col. 1, l. 46 to col. 2,
l. 2].
Lamb (p. 2, col. 2, ll. 16-27) also discloses:
In Fig. 4 a screen designated 24 of the character
heretofore described is shown as interposed in a
ventilating opening in a fire wall 25. The use of a screen
in such a wall permits the ventilation of spaces or
compartments such as paint spray rooms, for instance,
where the fire hazard is great without reducing the
margin of safety. Upon the occurrence of fire either
inside or outside the space, the normally reticulated
screen will be heat activated into the formation of an
impervious, non-inflammable screen which will preclude
the passage of flame or excessively hot air therethrough.
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