Koppers Company, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4769230 Process for preparation of arsenic acidExpiredAug 02, 82Sep 06, 88[C01G]
4663143 Hydrogen storage materials of CeNi.sub.5-x Mn.sub.x alloysExpiredDec 21, 83May 05, 87[C22C]
4656023 Hyperstoichiometric zirconium-titanium-chromium iron alloysExpiredJun 14, 85Apr 07, 87[C01B, C22C]
4642393 Process for preparing 1,4-dihydroxy, 5,8-dihydronaphthalene and related compoundsExpiredMar 06, 85Feb 10, 87[C07C]
4600784 High pressure synthesis of substituted tetrathiafulvalenesExpiredDec 27, 85Jul 15, 86[C07D]
4567032 Zirconium-manganese-iron alloysExpiredJun 05, 85Jan 28, 86[C01B, C22C]
4556551 Hydrogen storage materials of zirconium-chromium-iron and titanium alloys characterized by ZrCr.sub.2 stoichiometryExpiredMar 22, 84Dec 03, 85[C01B, C22C]
4522843 Deacidification of library materialsExpiredJan 25, 84Jun 11, 85[B05D]
4512965 Hydrogen storage materials of hyperstoichiometric alloysExpiredNov 21, 83Apr 23, 85[C01B, C22C]
4487669 Method for oxidation of an element in both compartments of an electrolytic cellExpiredJan 31, 83Dec 11, 84[]
4469268 Pneumatic feed system for axial lead componentsExpiredFeb 17, 82Sep 04, 84[H05R, B25G]
4469900 Complex formed for separating chlorinated phenolsExpiredJan 04, 84Sep 04, 84[C07C]
4469901 Complex formed for separating isopropylated m-cresolsExpiredJan 03, 84Sep 04, 84[C07C]
4466998 Wood impregnationExpiredJun 16, 82Aug 21, 84[B05D]
4465845 High pressure synthesis of sulfur-selenium fulvalenesExpiredApr 26, 82Aug 14, 84[C07D]
4447405 Removal of bromides from arsenic acid solutionExpiredAug 26, 82May 08, 84[C01B]
4431158 Controlled rotation self-inverting hot top casingExpiredAug 17, 81Feb 14, 84[B22D]
4412982 Zirconium-titanium-manganese-iron alloy characterized by ZrMn.sub.2 stoichiometryExpiredApr 30, 82Nov 01, 83[C01B, C22C]
4406874 ZrMn.sub.2 -Type alloy partially substituted with cerium/praseodymium/neodymium and characterized by AB.sub.2 stoichiometryExpiredApr 30, 82Sep 27, 83[C01B, C22C]
4402875 Substituted teraselenafulvalenes and high pressure synthesis thereofExpiredSep 18, 81Sep 06, 83[C07D]

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