US PATENT SUBCLASS 4 / 255.12
.~.~ With one way valve

Current as of: June, 1999
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4 /   HD   BATHS, CLOSETS, SINKS, AND SPITTOONS

255.01  DF  OBSTRUCTION REMOVER {3}
255.11  DF  .~ Force cup (e.g., a plunger) {1}
255.12.~.~ With one way valve

DEFINITION

Classification: 4/255.12

With one way valve:

(under subclass 255.11) Subject matter wherein the force cup has a device that will make the fluid flow in one direction to clean or clear the obstruction within or clear the obstruction from the drain pipe of the sink, bath, or flush closet.