US PATENT SUBCLASS 128 / 201.14
.~ Viewing strip slidable relative to mask

Current as of: June, 1999
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128 /   HD   SURGERY

200.24  DF  RESPIRATORY METHOD OR DEVICE {32}
201.14.~ Viewing strip slidable relative to mask

DEFINITION

Classification: 128/201.14

Viewing strip slidable relative to mask:

(under subclass 200.24) Subject matter including a viewing strip slidable relative to a face mask so that a portion of the strip that has become damaged or soiled during use of the mask can be replaced by a clear portion of the strip.

(1) Note. See subclass 205.25 for the definition of a face mask.