(under the class definition) Subject matter for manufacturing a solidified or liquified gas having a boiling point below 32 deg. F. from a gas or gas mixture at atmospheric pressure as a mercantile product by change of physical state by manipulation of temperature or pressure, and which may include apparatus converting liquified gas to a solid even though the conversion of a gas to a liquid is not included.
(1) Note. This may include apparatus converting liquified gas to a solid even though the conversion of a gas to a liquid is not included.
SEE OR SEARCH THIS CLASS, SUBCLASS:
55.5, for a cold trap for condensing undesirable gas or vapor in a vacuum line.
SEE OR SEARCH CLASS
149, Explosive and Thermic Compositions or Charges,
1, for compositions of that class containing liquified gaseous fuel or oxygen.
