US PATENT SUBCLASS 123 / 244
.~.~ Abutment

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}
244.~.~ Abutment

DEFINITION

Classification: 123/244

Abutment:

(under subclass 241) Apparatus wherein the enclosed space is formed at least in part by a partition structure mounted within the cylinder structure for oscillation or reciprocation relative thereto during rotation of the piston structure, wherein the partition structure engages the periphery of the piston structure to form a seal therebetween.

SEE OR SEARCH CLASS

418, Rotary Expansible Chamber Devices,

243+, for abutment-type rotary chamber devices.