US PATENT SUBCLASS 92 / 176
.~ With enclosed insulating space in piston part


Current as of: June, 1999
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92 /   HD   EXPANSIBLE CHAMBER DEVICES

172  DF  PISTON {19}
176.~ With enclosed insulating space in piston part


DEFINITION

Classification: 92/176

(under subclass 172) Apparatus in which the piston is provided with a sealed space in a portion thereof for the purpose of modifying the heat exchange properties of said piston portion.

(1) Note. The space may either be filled with a gas, or an insulating material, or may be under a vacuum.

SEE OR SEARCH CLASS

123, Internal-Combustion Engines,

41.16, for an internal combustion engine piston provided with

a closed space having a coolant material sealed in said space.