Oronzio deNora Impianti Elettrochimici S.p.A.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5015344 Electrodes with dual porosityExpiredApr 13, 88May 14, 91[C25B]
4975161 Electrodes for use in electrochemical processes and method for preparing the sameExpiredOct 30, 86Dec 04, 90[C25B]
4789443 Novel electrolysis cellExpiredNov 20, 86Dec 06, 88[C25B]
4778578 Deposition of catalytic electrodes of ion-exchange membranesExpiredNov 12, 87Oct 18, 88[C25B]
4772364 Production of halogens by electrolysis of alkali metal halides in an electrolysis cell having catalytic electrodes bonded to the surface of a solid polymer electrolyte membraneExpiredMay 27, 80Sep 20, 88[C25B]
4767519 Monopolar and bipolar electrolyzer and electrodic structures thereofExpiredOct 17, 86Aug 30, 88[C25B]
4749452 Multi-layer electrode membrane-assembly and electrolysis process using sameExpiredDec 30, 81Jun 07, 88[C25B]
4724052 Method for preparing an electrode and use thereof in electrochemical processesExpiredSep 29, 86Feb 09, 88[C25D]
4693797 Method of generating halogen and electrolysis cellExpiredApr 17, 86Sep 15, 87[C25B]
4668370 Electrode for electrochemical processes and use thereof in electrolysis cellsExpiredOct 25, 85May 26, 87[C25B]
4663003 Electrolysis cellExpiredSep 06, 85May 05, 87[C25B]
4648946 Electrode for electrochemical processes, method for preparing the same and use thereof in electrolysis cellsExpiredFeb 10, 86Mar 10, 87[C25D]
4618404 Electrode for electrochemical processes, method for preparing the same and use thereof in electrolysis cellsExpiredFeb 10, 86Oct 21, 86[C25B]
4615775 Electrolysis cell and method of generating halogenExpiredMay 02, 83Oct 07, 86[C25B]
4604173 Low oxygen overvoltage lead anodesExpiredAug 07, 85Aug 05, 86[C25C, C25B]
4602984 Monopolar electrochemical cell having a novel electric current transmission elementExpiredDec 17, 84Jul 29, 86[C25B]
4548697 Low oxygen overvoltage lead anodesExpiredJan 06, 84Oct 22, 85[C25B]
4533455 Bipolar separator plate for electrochemical cellsExpiredOct 31, 84Aug 06, 85[C25B]
4519889 Halogenation apparatusExpiredMay 24, 83May 28, 85[C25B]
4518113 Electrolyzer and processExpiredAug 25, 83May 21, 85[B23K]

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