US PATENT SUBCLASS 425 / 133.5
.~.~ For extruding film

Current as of: June, 1999
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425 /   HD   PLASTIC ARTICLE OR EARTHENWARE SHAPING OR TREATING: APPARATUS

130  DF  MEANS FEEDING FLUENT STOCK FROM PLURAL SOURCES TO COMMON SHAPING MEANS TO FORM COMPOSITE PRODUCT {2}
131.1  DF  .~ Extrusion shaping means {4}
133.5.~.~ For extruding film

DEFINITION

Classification: 425/133.5

(under subclass 131) Apparatus wherein the orifice is particularly adapted to the formation of a planar "film".

(1) Note. In the patents of this subclass, the specification either sets forth that the extruded product is a film or sets forth that the extruded product is extremely thin; i.e., less than about 0.050 inch (or 1.25 mm.) thick.