US PATENT SUBCLASS 441 / 99
.~.~.~.~ With manually operated valve

Current as of: June, 1999
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441 /   HD   BUOYS, RAFTS, AND AQUATIC DEVICES

80  DF  WATER RESCUE OR LIFE PROTECTING APPARATUS {8}
88  DF  .~ Personal flotation device {9}
90  DF  .~.~ With mechanical inflation means {3}
98  DF  .~.~.~ By gas generation from chemical reaction {2}
99.~.~.~.~ With manually operated valve

DEFINITION

Classification: 441/99

With manually operated valve:

(under subclass 98) Device wherein a hand operated valve means is used to adjust or control the flow of at least one of the reactants or of the evolved gas.