US PATENT SUBCLASS 169 / 17
.~.~ Dry pipe

Current as of: June, 1999
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169 /   HD   FIRE EXTINGUISHERS

5  DF  FLUID SYSTEMS {7}
16  DF  .~ Distributing systems {2}
17.~.~ Dry pipe

DEFINITION

Classification: 169/17

(under subclass 16) Systems, in which the pipes are normally closed and filled with gas, which is displaced by

extinguishing liquid when the system is active. Operation results from the pressure change following the opening of a thermally controlled outlet.