US PATENT SUBCLASS 4 / 426
.~.~.~ With check valve

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}
426.~.~.~ With check valve

DEFINITION

Classification: 4/426

With check valve:

(under subclass 421) Subject matter including a check valve in the siphon passage between a trap and a waste pipe.

SEE OR SEARCH CLASS

137, Fluid Handling,

217, for an anti-siphon valve.