US PATENT SUBCLASS 122 / 431
.~.~ Filter in boiler

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

412  DF  FEED HEATERS {17}
428  DF  .~ Internal conduit {5}
431.~.~ Filter in boiler

DEFINITION

Classification: 122/431

(under subclass 428) Subject matter in which a filter is located in the conduit inside the boiler.

SEE OR SEARCH THIS CLASS, SUBCLASS:

428, and 429, for traps inside the boiler.