US PATENT SUBCLASS 128 / 201.28
.~.~.~ Having valve, or valve control, structure

Current as of: June, 1999
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128 /   HD   SURGERY

200.24  DF  RESPIRATORY METHOD OR DEVICE {32}
201.22  DF  .~ Including body or head supported means covering user's scalp {1}
201.23  DF  .~.~ And nose and mouth also covered {6}
201.28.~.~.~ Having valve, or valve control, structure

DEFINITION

Classification: 128/201.28

Having valve, or valve control, structure:

(under subclass 201.23) Subject matter including a valve, or valve control, structure.

(1) Note. A patent is placed as an original in this subclass only if it claims structural details of a valve, (i.e., a mere nominal recitation of a valve is insufficient to place a patent here.