US PATENT SUBCLASS 418 / 56
.~ Non-metallic working member, cylinder or partition

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

54  DF  WORKING MEMBER HAS PLANETARY OR PLANETATING MOVEMENT {6}
56.~ Non-metallic working member, cylinder or partition

DEFINITION

Classification: 418/56

(under subclass 54) Apparatus in which the working member, cylinder or partition element is either made of or coated with a nonmetallic material.

(1) Note. A mere seal means made of nonmetallic material is not classifiable here. Classification of such devices will be made on other features.