US PATENT SUBCLASS 418 / 215
.~ Axially spaced working chambers

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

209  DF  PLURAL WORKING CHAMBERS {2}
215.~ Axially spaced working chambers {2}
216  DF  .~.~> Helical working member or working member portion
217  DF  .~.~> Axially moving abutment or vane {2}

DEFINITION

Classification: 418/215

(under subclass 209) Apparatus wherein the chambers are axially spaced.