Appeal No. 1999-0615
Application No. 08/786,974
or nitrogen) at a pressure of from about 25 to 200 pounds per
square inch or more. In addition, the apparatus includes a
compressed gas operated piston pump (5) for producing a flow
of the foamable liquid from the drum (4) to a mixing T (10)
where the foamable liquid is mixed with the compressed gas
from conduit (9) to generate a foam. From the mixing T (10),
the foam is passed via conduit (17) to an expansion chamber
(11) and subsequently to discharge conduit (12) which carries
the foam to a nozzle (14) for application at the point of use.
Stults discloses a high-expansion foam generating fire
extinguishing system for a fixed installation such as a
warehouse or storage building (10). In this instance, the
system includes a container (22) of nitrogen gas under
pressure that is used to force a concentrate mix solution of
foamable liquid through line (40) to a manifold (44)
associated with a plurality of nozzles (60) which emit conical
streams (68) of concentrate mix solution against a foam
generating screen (56) to thereby create copious amounts of
foam (70). The examiner specifically points to the disclosure
in Stults at column 1, lines 15-18, relating to the statement
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