US PATENT SUBCLASS 128 / 205.11
.~.~ Means for varying air/oxygen ratio

Current as of: June, 1999
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128 /   HD   SURGERY

200.24  DF  RESPIRATORY METHOD OR DEVICE {32}
204.18  DF  .~ Means for supplying respiratory gas under positive pressure {17}
205.11.~.~ Means for varying air/oxygen ratio

DEFINITION

Classification: 128/205.11

Means for varying air/oxygen ratio:

(under subclass 204.18) Subject matter including a means for varying the amount of oxygen added to air breathed by the user.