US PATENT SUBCLASS 418 / 178
WITH WEAR SURFACE TREATMENT OR INTEGRALLY PLATED WEAR LAYER


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

178WITH WEAR SURFACE TREATMENT OR INTEGRALLY PLATED WEAR LAYER


DEFINITION

Classification: 418/178

(under the class definition) Apparatus in which a part having a surface portion comprising a portion of the working chamber is provided at least in part with either (1) a coating of a material other than that making up the remainder of the part intimately forming an impartible part thereof or (2) is made of a single material which has been treated to provide the working chamber surface portion with specific properties which properties are different from the properties of the remainder of the part.