US PATENT SUBCLASS 73 / 863.23
.~.~ Sieve, filter, or semipermeable membrane

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

863  DF  SAMPLER, SAMPLE HANDLING, ETC. {11}
863.21  DF  .~ With constituent separation {2}
863.23.~.~ Sieve, filter, or semipermeable membrane {2}
863.24  DF  .~.~.~> Cleaning
863.25  DF  .~.~.~> Changing feature

DEFINITION

Classification: 73/863.23

Sieve, filter, or semipermeable membrane:

(under subclass 863.21) Subject matter including a barrier having interstices, pores or micropores through which at least part of the source or sample flows but which trap some components of the flow, usually particulate.