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.