US PATENT SUBCLASS 285 / FOR 136
.~.~.~ Antisiphon (285/154)

Current as of: June, 1999
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285 /   HD   PIPE JOINTS OR COUPLINGS

FOR 100  DF  SYSTEMS (285/120) {11}
FOR 132  DF  .~ Branched (285/150) {4}
FOR 135  DF  .~.~ With vent (285/153) {1}
FOR 136.~.~.~ Antisiphon (285/154)

DEFINITION

Classification: 285/FOR.136

Foreign art collection including means, generally a particular air chamber or arrangement of vent openings, for preventing the "blow-out" of trap liquids-seals upstream of the claimed coupling.