Scientific Process & Research, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5056925 Extruder screws and method for accelerating melting in plasticating extrudersExpiredJun 01, 90Oct 15, 91[B29B]
4637790 Multiple-stage plasticating extrudersExpiredJun 12, 85Jan 20, 87[B29B]
4472059 Reduced wear plasticating extruder screw conveyorsExpiredSep 28, 82Sep 18, 84[B28B, B01F]
4387997 Plasticating extruder screw conveyorsExpiredSep 16, 81Jun 14, 83[B29B]
4309114 Method for attaining maximum production effectiveness in a plasticating extruderExpiredFeb 11, 80Jan 05, 82[B29F]
4290702 Plasticating apparatus for molding devicesExpiredDec 17, 79Sep 22, 81[B29B]

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