US PATENT SUBCLASS 92 / 60
WITH FLEXIBLE OR RESILIENTLY BIASED NON-WORKING MEMBER MOVABLE WALL IN CONSTANT COMMUNICATION WITH WORKING CHAMBER

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

60WITH FLEXIBLE OR RESILIENTLY BIASED NON-WORKING MEMBER MOVABLE WALL IN CONSTANT COMMUNICATION WITH WORKING CHAMBER

DEFINITION

Classification: 92/60

(under the class definition) Apparatus including a movable wall for the expansible chamber device other than a working member positioned to be in constant open communication with the working chamber, said movable wall being either (1) made of resilient flexible material or (2) urged in one direction by means of a spring device.