US PATENT SUBCLASS 137 / 247.47
.~.~.~.~ Topside access opening

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

247  DF  WITH LIQUID VALVES OR LIQUID TRAP SEALS {3}
247.11  DF  .~ Liquid seal in liquid flow line; flow liquid forms seal {8}
247.41  DF  .~.~ U-seals {3}
247.45  DF  .~.~.~ Enlarged upflow leg {1}
247.47.~.~.~.~ Topside access opening

DEFINITION

Classification: 137/247.47

(under subclass 247.45) Seals with a top side access means located above the liquid seal level.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.43, for the same apparatus positioned beneath a surface, such as a floor, having a covered access opening therein.