US PATENT SUBCLASS 418 / 50
.~ Non-metallic working member or working chamber portion

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

49  DF  NUTATING WORKING MEMBER {3}
50.~ Non-metallic working member or working chamber portion

DEFINITION

Classification: 418/50

(under subclass 49) Apparatus in which the working member or other working chamber part is either made of or coated with a nonmetallic material.

(1) Note. A mere seal means made of nonmetallic material is not considered proper for classification here. See subclasses 104 for mechanical sealing and 152 for a nonmetallic working member, cylinder or partition.