Polysar Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5336719 Transparent toughened plasticsExpiredApr 26, 93Aug 09, 94[C08L]
5268051 Self-bonding tapesExpiredNov 09, 88Dec 07, 93[B31C]
5252664 Transparent toughened thermoplasticsExpiredJun 27, 91Oct 12, 93[C08L]
5244965 Polymer solution treatment processExpiredJun 14, 89Sep 14, 93[C08J]
5194528 Dimer reductionExpiredJun 20, 89Mar 16, 93[C08F]
5079296 Transparent toughened thermoplasticsExpiredJul 21, 89Jan 07, 92[C08L]
5051299 Fibre reinforced beltExpiredOct 13, 89Sep 24, 91[B32B]
5045603 Chlorinated EPDM with superior stabilityExpiredJul 19, 90Sep 03, 91[C08F]
5043392 Toughened thermoplasticsExpiredJan 22, 90Aug 27, 91[C08F, C08K]
5026744 Synthetic clayExpiredJan 17, 89Jun 25, 91[C08L, C08K]
5026794 Adducts of an hydroxy-free acrylate resin and an epoxy resinExpiredMay 23, 89Jun 25, 91[C08L]
4990456 Analysis of asphaltExpiredOct 31, 88Feb 05, 91[G01N]
4985540 Process for removing rhodium-containing catalyst residue from hydrogenated nitrile rubberExpiredNov 20, 89Jan 15, 91[C08F]
4983528 Measurement of unsaturation level in butyl and EPDM rubbersExpiredJun 06, 89Jan 08, 91[G01N]
4980406 Fortified polyacrylate resinsExpiredJul 22, 88Dec 25, 90[C08K]
4959420 Chlorinated EPDM with superior stabilityExpiredNov 01, 89Sep 25, 90[C08F]
4956398 Nitrile rubber/vinyl chloride polymer/silica compositionsExpiredJun 07, 89Sep 11, 90[C08L, C08K]
4944926 Method to treat rhodium-containing solutionsExpiredAug 01, 88Jul 31, 90[C08C, C01G]
4942920 Heat exchanger leak detectionExpiredApr 27, 89Jul 24, 90[G01M, F28F]
4943616 Living cationic polymerization processExpiredDec 04, 89Jul 24, 90[C08F]

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