US PATENT SUBCLASS 251 / 328
.~.~ Seats

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

318  DF  RECIPROCATING VALVE {7}
326  DF  .~ Gate {3}
328.~.~ Seats

DEFINITION

Classification: 251/328

(under subclass 326) Devices comprising the substantially stationary valve element with which the head cooperates to produce the valving action.

SEE OR SEARCH THIS CLASS, SUBCLASS:

359+, for valve seats of general utility.