US PATENT SUBCLASS 128 / 205.29
.~.~ Particulate filtering

Current as of: June, 1999
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128 /   HD   SURGERY

200.24  DF  RESPIRATORY METHOD OR DEVICE {32}
205.27  DF  .~ Means for removing substance from respiratory gas {2}
205.29.~.~ Particulate filtering {2}
206.11  DF  .~.~.~> Including means inserted in nasal passage
206.12  DF  .~.~.~> Face mask covering a breathing passage {7}

DEFINITION

Classification: 128/205.29

Particulate filtering:

(under subclass 205.27) Subject matter for filtering solid particles from respiratory gas.