US PATENT SUBCLASS 128 / 206.17
.~.~.~.~ With separate filter encircling element, or housing, securing filter on mask

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  DF  .~.~ Particulate filtering {2}
206.12  DF  .~.~.~ Face mask covering a breathing passage {7}
206.17.~.~.~.~ With separate filter encircling element, or housing, securing filter on mask

DEFINITION

Classification: 128/206.17

With separate filter encircling element, or housing, securing filter on mask:

(under subclass 206.12) Subject matter including a separate filter encircling element, or housing, securing the filter on the mask.