Kabushiki Kaisha Plastic Kogaku Kenkyusho

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4669965 Multi-layer extrusion dieExpiredSep 07, 84Jun 02, 87[B29C]
4290994 Method of molding hollow bodiesExpiredMay 06, 80Sep 22, 81[B29C]
4185954 Die for extruding tubes composed of a plurality of layersExpiredAug 23, 77Jan 29, 80[B29D]

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