Elastomeric valve and piston structure for product dispenser
Patent 4936493 Issued on June 26, 1990. Estimated Expiration Date: 
November 23, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 23, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3088636 3162334 3211340 Dispensing pump Dispenser container for viscous fluids Dispenser container with compressible pump Dispenser for liquids or pasty products Dispenser for paste-like products Dispenser for paste-like products Cream-state fluid container InventorsAssigneeApplicationNo. 124298 filed on 11/23/1987US Classes:222/209, Fluid pressure generating pump or pulsator and/or removable flexible wall closures137/846, Having exit lip222/213, Resilient wall actuated222/385, Pump or pulsator casing within supply container222/387, Valved outlet, movable discharge guide and/or gas vent222/400.5, Simultaneously operative material discharge valve and pump or pulsator operating member222/494, Spring form, resilient or compressible flow controller or closure222/556, Pivoted401/146, In or at feeder401/150, Piston in cylinder401/176Slidable pistonExaminersPrimary: Rolla, Joseph J.Assistant: Bollinger, David H. Attorney, Agent or FirmForeign Patent References
International ClassesB65D 037/00556 400.5 256 257 259 AbstractAn elastomeric piston member of a product dispenser for semi-viscous liquids includes integrally molded priming valve structure as well as check valve structure. The priming valve comprises a number of generally flat, triangular segments arranged around the periphery of an outlet conduit leading from a pumping chamber, and during a pumping stroke of the piston member, outermost tips of each segment deflect laterally to allow discharge of products from the chamber. The triangular segments are molded in an open or spaced apart orientation to facilitate manufacture, and are biased by ribs of a discharge spout toward a closed, inclined orientation in contact with adjacent segments once the dispenser is assembled.Field of SearchRESILIENT WALLSupply container delivering to receiving chamber Fluid pressure generating pump or pulsator and/or removable flexible wall closures With flow controllers or closures Resilient wall actuated Wall deflecting means With material supply container and discharge assistant with casing (e.g., supply container and pump) Valve outlet Pump or pulsator casing within supply container Container with follower Valved outlet, movable discharge guide and/or gas vent Fluid pressure actuated Intermittent grip-type actuator For reciprocating piston on follower-type impeller Biasing means within material chamber or passage OUTLET ELEMENT OPERATED BY PRESSURE OF CONTENTS Axial discharge Spring form, resilient or compressible flow controller or closure Having exit lip With biasing means Multiple slit | |
