US PATENT SUBCLASS 91 / 223
.~.~ Oscillating piston (e.g., vane)

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

218  DF  CYCLICALLY OPERABLE {34}
222  DF  .~ Distributor in piston (422) {6}
223.~.~ Oscillating piston (e.g., vane)

DEFINITION

Classification: 91/223

(under subclass 222) Apparatus in which the piston moves back and forth about an axis to describe an arc of not more than 360 degrees.

(1) Note. The term "piston", as employed in the definition of this subclass, includes a vane swinging within a working chamber.