US PATENT SUBCLASS 4 / 369
.~.~.~ Including means to relieve trapped air

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

300  DF  FLUSH CLOSET {22}
353  DF  .~ Tank only {9}
368  DF  .~.~ With outlet siphon {6}
369.~.~.~ Including means to relieve trapped air {2}
370  DF  .~.~.~.~> By releasing trapped air
371  DF  .~.~.~.~> By raising trapped air housing

DEFINITION

Classification: 4/369

Including means to relieve trapped air:

(under subclass 368) Subject matter having means to reduce trapped air pressure, in the siphon, to initiate liquid flow through the siphon.

SEE OR SEARCH CLASS

137, Fluid Handling,

136+, for periodic discharge siphons which include means for releasing trapped air for initiating the flow of liquid through the siphon.