US PATENT SUBCLASS 123 / 240
.~.~.~ Concentric

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

200  DF  ROTARY {12}
221  DF  .~ With transfer means intermediate single compression volume means and single expansion volume means {5}
239  DF  .~.~ Compression volume means radially disposed relative to expansion volume means {1}
240.~.~.~ Concentric

DEFINITION

Classification: 123/240

Concentric:

(under subclass 239) Apparatus wherein the means to pressurize the combustible material and the means to receive the combusted material both are essentially toroidally, and further wherein one of the means encircles the other, with a common center, such that the air or combustible material is transferred from one toroidal shaped means to the other.