US PATENT SUBCLASS 417 / 342
.~.~.~ Including closed fluid interconnection between working members

Current as of: June, 1999
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417 /   HD   PUMPS

321  DF  MOTOR DRIVEN {32}
338  DF  .~ Relatively movable pumping members driven by relatively movable working members {1}
339  DF  .~.~ Nonrotary pumping and fluid motor working members {5}
342.~.~.~ Including closed fluid interconnection between working members

DEFINITION

Classification: 417/342

(under subclass 339) Apparatus in which the working members are interconnected by a body of fluid which is totally confined during at least a portion of working member movement, the confining means for said body of fluid being formed in part by said working members or portions connected thereto so that movement of one working member necessitates movement of the other.

(1) Note. The fluid interconnection under this definition must be between faces or portions of the working members other than their fluid working faces or portions.

(2) Note. Plural working members which are interconnected solely by a confined body of fluid are intended to fall within the scope of this definition, even though the disclosed normal mode of operation may not provide for relative working member motion.