Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means between charger and mold to cut off flow of...
Reexamination Certificate
2008-07-29
2008-07-29
Gupta, Yogendra (Department: 1791)
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means between charger and mold to cut off flow of...
C425S562000, C425S547000, C425S572000
Reexamination Certificate
active
07404713
ABSTRACT:
A shutoff valve mechanism for a plastic injection molding system and process. The shutoff valve mechanism is positioned between the nozzle of the injection molding machine and the hot runner manifold. Force applied by the machine nozzle moves an inner body member in the shutoff valve mechanism and opens a valve allowing molten plastic material to flow through the valve and into the hot runner, sprue bushings, and mold cavities. A biasing mechanism, such as a plurality of spring washer members, returns the inner body member to its rest position, thereby closing the valve mechanism when the machine nozzle is retracted.
REFERENCES:
patent: 4678427 (1987-07-01), Fritzsche
patent: 4695238 (1987-09-01), Taniguchi
patent: 5012839 (1991-05-01), Rogers et al.
patent: 5164207 (1992-11-01), Durina
patent: 2004/0191357 (2004-09-01), Babin
patent: 2007/0132146 (2007-06-01), Klobucar
Artz John A.
D Ewald Maria Veronica
Gupta Yogendra
Incoe Corporation
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