US PATENT SUBCLASS 417 / 499-- .~.~ Having means to effect control at different positions of pumping member stroke

US PATENT SUBCLASS 417 / 499
.~.~ Having means to effect control at different positions of pumping member stroke

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}
499		.~.~ Having means to effect control at different positions of pumping member stroke

DEFINITION

Classification: 417/499

(under subclass 490) Apparatus including means which may be selectively moved and held in different positions to effect opening or closing of such port at different positions of pumping member stroke.

SEE OR SEARCH THIS CLASS, SUBCLASS:

494, for a pump chamber having plural controlled inlet or outlet flow paths, control of one of said paths being effected by a pumping member controlled port which has means associated therewith for effecting the control thereof at different positions of pumping member stroke.