US PATENT SUBCLASS 222 / 491
OUTLET ELEMENT OPERATED BY PRESSURE OF CONTENTS

Current as of: June, 1999
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222 /   HD   DISPENSING

491OUTLET ELEMENT OPERATED BY PRESSURE OF CONTENTS {3}
492  DF  .~> Axially slidable tube, sleeve, or apertured cap {1}
494  DF  .~> Spring form, resilient or compressible flow controller or closure
495  DF  .~> Reciprocable, nonpivoted {1}

DEFINITION

Classification: 222/491

(under the class definition) Dispensers in which there is a movable outlet element operated by the pressure of the container contents, where the pressure creating means are not claimed.

(1) Note. The movable element is usually a discharge guide, flow controller or closure. Since many types of such devices having manual actuators are capable of actuation by the pressure of the contents, though not intended to so operate,

only those disclosed for pressure operation and having no manual actuator are placed here.

(2) Note. Where the means for creating the pressure on the contents is claimed, see appropriate preceding subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

92+, for collapsible wall type receptacles. Where the pressure operable outlet element is claimed in combination with a collapsible wall receptacle recited by name (no characteristics thereof being recited and no combined feature for operation on the wall) the patent is placed in 491+.

251+, and see the notes thereto for dispensers having means for creating pressure on the container contents. 335, for valves, closures, followers, pistons, etc., arranged on the receptacle interior, the pressure of the material dispensed causing the same to move toward the outlet and push material ahead of the same.

490, for slitted resilient diaphragms or nipples.

SEE OR SEARCH CLASS

137, Fluid Handling,

455+, for valves operated by a change of line fluid condition, as by increased pressure; subclasses 602+ for systems having multiple inlet with single outlet; subclasses 861+ for systems with flow control means for plural passages; and subclasses 613+ for single flow path systems with plural serial valves and/or closures.

220, Receptacles,

203.01+, for a receptacle closure comprising a pressure responsive vent or valve.

221, Article Dispensing,

295, for article dispensers which are latch released and article weight operated.