US PATENT SUBCLASS 418 / 139
.~ Seal element between abutment and cylinder or working member

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

104  DF  WITH MECHANICAL SEALING {14}
139.~ Seal element between abutment and cylinder or working member

DEFINITION

Classification: 418/139

(under subclass 104) Apparatus provided with a movable abutment and means mounted thereon or on either the working member or the cylinder for engagement therebetween to oppose the passage of fluid therepast.