US PATENT SUBCLASS 92 / 100
.~.~.~.~.~ Member includes coextensive plate-like elements secured to opposite side of diaphragm

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

89  DF  COLLAPSIBLE CHAMBER WALL PORTION (E.G., HINGED OR FLEXIBLE WALL) {1}
90  DF  .~ Wall portion formed of flexible material {5}
96  DF  .~.~ Diaphragm type {4}
98 R  DF  .~.~.~ Entire periphery secured to rigid working chamber forming wall {4}
99  DF  .~.~.~.~ With undistortable member secured to central portion of diaphragm {1}
100.~.~.~.~.~ Member includes coextensive plate-like elements secured to opposite side of diaphragm

DEFINITION

Classification: 92/100

(under subclass 99) Apparatus in which said rigid member includes a pair of plate-like members of the same area, said plate-like members being positioned on opposite sides of the diaphragm.