El-Chem Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4525425 Water and oil repellent metal oxide-organic combination coating systems and method of making sameExpiredMay 11, 81Jun 25, 85[B32B]
4372823 Rechargeable electrical storage battery with zinc anode and aqueous alkaline electrolyteExpiredOct 16, 81Feb 08, 83[H01M]
4307164 Rechargeable electrical storage battery with zinc anode and aqueous alkaline electrolyteExpiredDec 06, 79Dec 22, 81[H01M]
4207391 Rechargeable electrical storage battery with zinc anode and aqueous alkaline electrolyteExpiredJul 25, 78Jun 10, 80[H01M]

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