Gerhard Collardin GmbH

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5026440 Chromium free treatment before coating metal surfacesExpiredAug 24, 89Jun 25, 91[C23C]
4968360 Process for desludging phosphating baths and device for carrying out said processExpiredDec 13, 88Nov 06, 90[C23C]
4956016 Anticorrosive agents and use thereofExpiredFeb 28, 89Sep 11, 90[C09D, C23F]
4944813 Process for phosphating metal surfacesExpiredJan 13, 89Jul 31, 90[C23C]
4775427 Phosphate conversion coatings for composite metalsExpiredSep 17, 87Oct 04, 88[C23C]
4762572 Process for phosphating electrolytically zinc-coated metalsExpiredOct 20, 86Aug 09, 88[C23C]
4761189 Process and aqueous compositions for treating metal surfacesExpiredMay 20, 87Aug 02, 88[C23C]
4707193 Method for activating metal surfaces prior to zinc phosphationExpiredNov 24, 86Nov 17, 87[C23C]
4680064 Phosphate conversion coating acceleratorsExpiredSep 27, 85Jul 14, 87[C23C]
4639319 Electrolyte stabilization of laticesExpiredJul 22, 85Jan 27, 87[B01D]
4636264 Autodeposition post-bath rinse processExpiredNov 26, 85Jan 13, 87[B05D, C23F]
4622078 Process for the zinc/calcium phosphatizing of metal surfaces at low treatment temperaturesExpiredFeb 20, 85Nov 11, 86[C23C]
4600447 After-passivation of phosphated metal surfacesExpiredDec 14, 84Jul 15, 86[C23C]
4565611 Aqueous electrolytes and method for electrodepositing nickel-cobalt alloysExpiredMay 01, 85Jan 21, 86[C25D]
4497668 Phosphating process for zinc-plated metalsExpiredNov 25, 83Feb 05, 85[C23F]
4490185 Phosphating solutions and processExpiredNov 30, 83Dec 25, 84[C23F]
4384900 Method of treating metal surfaces prior to phosphatizationExpiredDec 22, 80May 24, 83[C23F, C11D]
4326894 Process for the production of conversion layers on metal surfaces by the spray methodExpiredJun 11, 81Apr 27, 82[C23F]

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