Pennwalt Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5242672 Process for removing sulfur from organic polysulfidesExpiredMay 02, 88Sep 07, 93[C01B, E21B]
5132387 Hindered amine light stabilizer hydrazides for stabilizing polyurethane, polyurea and polyurethane-polyurea polymersExpiredJan 07, 91Jul 21, 92[C08G]
5114426 Chemical stonewash methods for treating fabricsExpiredDec 28, 88May 19, 92[D06L]
5115472 Electroacoustic noveltiesExpiredOct 07, 88May 19, 92[H01L, H04R, G09F]
5107120 Passive infrared detectorExpiredSep 22, 89Apr 21, 92[G01J]
5102568 Thiadiazole compounds and lubricant additives thereofExpiredFeb 05, 88Apr 07, 92[C10M, C07D]
5093029 Breaking emulsions of alkanesulfonyl chlorides in aqueous hydrochloric acidExpiredAug 11, 89Mar 03, 92[B01D]
5091593 Process for removing sulfur from organic sulfidesExpiredMay 26, 89Feb 25, 92[C07C]
5081169 Organic sulfide stabilized polymeric engineering resinsExpiredOct 31, 89Jan 14, 92[C08K]
5070124 Sulfide antioxidants for stabilizing crosslinked polyolefinsExpiredOct 31, 89Dec 03, 91[C08K]
5068427 Process for the preparation of alkane- and arenesulfonamidesExpiredNov 16, 89Nov 26, 91[C07C]
5051531 Antioxidant-peroxidesExpiredMay 31, 88Sep 24, 91[C07C]
5049697 High yield method for preparation of dialkyl esters of polyhaloaromatic acidsExpiredSep 16, 88Sep 17, 91[C07C]
5043372 N,N'-hydrocarbylenebis[N-hals-substituted amic acid hydrazides] and their derivativesExpiredDec 22, 89Aug 27, 91[C07D, C08K]
5043374 Halogenated polyester flame retardants for polyphenylene ether, polyolefin and polyethylene terephthalate resinsExpiredNov 06, 89Aug 27, 91[C08K]
5041545 2-hydroxybenzophenone hydrazides and derivatives thereofExpiredApr 06, 89Aug 20, 91[C07D]
5037894 Polymer bound flame retardantsExpiredNov 07, 88Aug 06, 91[C08F]
5034460 Coating of vinylidene fluoride polymer and fluorine containing graft copolymerExpiredMay 23, 89Jul 23, 91[C08G]
5034648 Dual direction switchExpiredOct 31, 89Jul 23, 91[H01L]
5030679 Organic sulfide antioxidants and polymers stabilized therewithExpiredOct 31, 89Jul 09, 91[C07C, C08K]

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