Keramchemie GmbH

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6375915 Method of regenerating a spent pickling solutionExpiredNov 12, 97Apr 23, 02[C23G]
5759307 Method of producing a cold-rolled strip in one passExpiredAug 30, 96Jun 02, 98[C21D]
5545260 Pickling installation and method for operating this pickling installationExpiredDec 03, 93Aug 13, 96[C23G]
4976751 Method for purification of exhaust airExpiredSep 19, 89Dec 11, 90[B01D]
4800128 Chemical attack-resistant, liquid-tight liningExpiredJun 04, 87Jan 24, 89[E04B, B65D, B32B]
4723968 Method and apparatus for the purification of waste air containing biologically decomposable impuritiesExpiredMar 06, 87Feb 09, 88[B01D]

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