US PATENT SUBCLASS 123 / 245
.~.~ Alternately approaching and receding elements

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

200  DF  ROTARY {12}
241  DF  .~ With compression, combustion, and expansion in a single variable volume {4}
245.~.~ Alternately approaching and receding elements {1}
246  DF  .~.~.~> Eccentric interengaging rotors

DEFINITION

Classification: 123/245

Alternately approaching and receding elements:

(under subclass 241) Apparatus wherein the enclosed space is formed by the simultaneous combined movement produced by the rotation of a plurality of elements or piston structures and the oscillation of two or more of the elements or piston structures.

SEE OR SEARCH THIS CLASS, SUBCLASS:

43+, for an internal-combustion engine wherein the piston reciprocates relative to a toroidal cylinder.

SEE OR SEARCH CLASS

418, Rotary Expansible Chamber Devices,

33+, for alternating piston-type rotary chamber devices.