US PATENT SUBCLASS 4 / 423
.~.~.~.~ With vacuum breaker

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

300  DF  FLUSH CLOSET {22}
420  DF  .~ Bowl {7}
421  DF  .~.~ Siphon discharge {8}
422  DF  .~.~.~ With flush valve {1}
423.~.~.~.~ With vacuum breaker

DEFINITION

Classification: 4/423

With vacuum breaker:

(under subclass 422) Subject matter wherein the valve includes means to break a vacuum to prevent back siphonage or reverse flow.