NORTHERN PETROCHEMICAL COMPANY

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Expired/Abandoned/Withdrawn Patents

Patent # Title Filing Date Issue/Pub Date Intl Class
5,006,619 Polymerization catalyst and methodFeb 27, 84Apr 09, 91[C08F]
4,643,945 Heat sealable blend of polypropylene terpolymers and linear low density polyethyleneSep 03, 85Feb 17, 87[B32B]
4,629,657 Biaxially oriented polypropylene film construction for special laminationDec 13, 82Dec 16, 86[B32B]
4,629,749 Clarity of low density polyethylene compositions containing anti-block agents by addition of polyethylene glycolJul 24, 85Dec 16, 86[C08K]
4,529,780 Process for polymerizing alpha olefins with phenolic compound containing catalystsNov 19, 81Jul 16, 85[C08F]
4,526,883 Olefin polymerization catalyst activity by simultaneous olefin washing and addition of electron donorJun 20, 84Jul 02, 85[C08F]
4,513,117 Process for conversion of vinyl copolymers to vinylic alcohol copolymers by homogeneous reaction with organometallic compoundsMay 07, 84Apr 23, 85[C08F]
4,482,638 In situ process for producing an alpha olefin polymerization catalyst componentJul 14, 83Nov 13, 84[C08F]
4,471,064 Olefin polymerization catalyst activity by olefin washing and readdition of electron donorSep 09, 83Sep 11, 84[C08F]
4,471,065 Olefin polymerization catalyst activity by olefin washingSep 09, 83Sep 11, 84[C08F]
4,463,102 Polyolefin polymerization catalyst containing sterically unhindered phenolic compounds (II)Jan 28, 83Jul 31, 84[C08F]
4,457,852 Anti-gel characteristics of silicate-containing antifreeze compositionsJul 14, 83Jul 03, 84[C09K]
4,426,309 Antifreeze corrosion inhibitor composition for aluminum enginesMar 10, 83Jan 17, 84[C09K, F28F]
4,426,318 Supported polyethylene polymerization catalysts utilizing substituted polystyrene resinsDec 01, 82Jan 17, 84[C08F]
4,407,879 Method of producing a textured filmAug 07, 81Oct 04, 83[B32B]
4,382,870 Antifreeze corrosion inhibitor composition for aluminum enginesJul 06, 81May 10, 83[C09K, F28F]
4,375,531 High impact visbroken polymeric blendsJan 11, 82Mar 01, 83[C08L]
4,364,852 Polyolefin catalysts containing heterocyclic carboxylic acid estersJun 04, 81Dec 21, 82[C08F]
4,292,034 Partition folding and inserting machineNov 28, 79Sep 29, 81[B31B]

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