US PATENT SUBCLASS 418 / 94
.~.~ With non-working fluid passage in drive shaft

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

83  DF  HEAT EXCHANGE OR NON-WORKING FLUID LUBRICATING OR SEALING {13}
91  DF  .~ Non-working fluid passage in inner working or reacting member {3}
94.~.~ With non-working fluid passage in drive shaft

DEFINITION

Classification: 418/94

(under subclass 91) Apparatus in which the flow path for the nonworking fluid includes a duct means in the drive shaft of the device.