NORTHERN PETROCHEMICAL COMPANY

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5006619 Polymerization catalyst and methodExpiredFeb 27, 84Apr 09, 91[C08F]
4643945 Heat sealable blend of polypropylene terpolymers and linear low density polyethyleneExpiredSep 03, 85Feb 17, 87[B32B]
4629657 Biaxially oriented polypropylene film construction for special laminationExpiredDec 13, 82Dec 16, 86[B32B]
4629749 Clarity of low density polyethylene compositions containing anti-block agents by addition of polyethylene glycolExpiredJul 24, 85Dec 16, 86[C08K]
4529780 Process for polymerizing alpha olefins with phenolic compound containing catalystsExpiredNov 19, 81Jul 16, 85[C08F]
4526883 Olefin polymerization catalyst activity by simultaneous olefin washing and addition of electron donorExpiredJun 20, 84Jul 02, 85[C08F]
4513117 Process for conversion of vinyl copolymers to vinylic alcohol copolymers by homogeneous reaction with organometallic compoundsExpiredMay 07, 84Apr 23, 85[C08F]
4482638 In situ process for producing an alpha olefin polymerization catalyst componentExpiredJul 14, 83Nov 13, 84[C08F]
4471064 Olefin polymerization catalyst activity by olefin washing and readdition of electron donorExpiredSep 09, 83Sep 11, 84[C08F]
4471065 Olefin polymerization catalyst activity by olefin washingExpiredSep 09, 83Sep 11, 84[C08F]
4463102 Polyolefin polymerization catalyst containing sterically unhindered phenolic compounds (II)ExpiredJan 28, 83Jul 31, 84[C08F]
4457852 Anti-gel characteristics of silicate-containing antifreeze compositionsExpiredJul 14, 83Jul 03, 84[C09K]
4426309 Antifreeze corrosion inhibitor composition for aluminum enginesExpiredMar 10, 83Jan 17, 84[C09K, F28F]
4426318 Supported polyethylene polymerization catalysts utilizing substituted polystyrene resinsExpiredDec 01, 82Jan 17, 84[C08F]
4407879 Method of producing a textured filmExpiredAug 07, 81Oct 04, 83[B32B]
4382870 Antifreeze corrosion inhibitor composition for aluminum enginesExpiredJul 06, 81May 10, 83[C09K, F28F]
4375531 High impact visbroken polymeric blendsExpiredJan 11, 82Mar 01, 83[C08L]
4364852 Polyolefin catalysts containing heterocyclic carboxylic acid estersExpiredJun 04, 81Dec 21, 82[C08F]
4292034 Partition folding and inserting machineExpiredNov 28, 79Sep 29, 81[B31B]

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