US PATENT SUBCLASS 417 / 477.12
.~.~.~.~ Specific flexible wall or interposed flexible member

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}
477.12.~.~.~.~ Specific flexible wall or interposed flexible member

DEFINITION

Classification: 417/477.12

Specific flexible wall or interposed flexible member:

(under subclass 477.1) Apparatus wherein significance is attributed to a shape or material of the flexible wall or interposed flexible member.

(1) Note. The interposed flexible member may include a particular means associated with the flexible wall to reduce wear on the flexible wall by the rolling or sliding elements. [figure]