(under the class definition) Apparatus comprising a working chamber forming member provided with a housing, spaced from and enclosing the outer wall thereof to form a space between said structure and outer wall which space is designed to (1) form a jacket for circulating a heat exchange fluid therein or (2) form an insulating space to reduce the flow of heat to or from the working chamber through the walls of said member.
(1) Note. A cylinder head or end closure provided with a heat exchange modifying space or jacket is included under this definition.
SEE OR SEARCH CLASS
123, Internal-Combustion Engines,
41.72+, and subclass 195 for a jacketed cylinder or end closure therefor for receiving circulating heat exchange liquid to cool the operating parts of an internal combustion engine. A specific disclosure that a jacketed cylinder or end closure therefor is to form a part of an internal combustion engine is sufficient for classification in Class 123.
165, Heat Exchange, appropriate subclasses for a heat
exchange modifying space or jacket of general utility. Class 165 takes a nominally claimed cylinder or working chamber forming member of an expansible chamber device, where the claim is otherwise directed to a surrounding space or jacket designed to modify the heat exchange properties of the cylinder or member. 220, Receptacles,
592.01+, for a receptacle having means for maintaining its contents above or below ambient temperature and particularly subclass 592.05 for such a receptacle having spaced walls.
