US PATENT SUBCLASS 417 / 477.9
.~.~.~.~ Specific backing member for flexible wall

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
474  DF  .~ Elongated flexible chamber wall progressively deformed {2}
476  DF  .~.~ Deformation by rolling or sliding engagement member {1}
477.1  DF  .~.~.~ Plural spaced engagement members or member portions {6}
477.9.~.~.~.~ Specific backing member for flexible wall {1}
477.11  DF  .~.~.~.~.~> Adjustable backing

DEFINITION

Classification: 417/477.9

Specific backing member for flexible wall:

(under subclass 477.1) Apparatus wherein the significance is attributed to a particular shape or position or material of the backing member for the flexible wall. [figure]