US PATENT SUBCLASS 417 / 500
.~.~ Control by movement of pumping member about axis

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
490  DF  .~ Pumping member position controlled port {8}
500.~.~ Control by movement of pumping member about axis

DEFINITION

Classification: 417/500

(under subclass 490) Apparatus in which the working member rotates about its longitudinal axis during reciprocation thereof to effect the covering and uncovering of said port.

SEE OR SEARCH THIS CLASS, SUBCLASS:

492, for an inlet or exhaust control for plural chambers comprising a common working member movable about an axis.