Electrolytic production of high purity alkali metal hydroxide
Patent 4192725 Issued on March 11, 1980. Estimated Expiration Date: 
March 11, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 11, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2967807 2978401 3257334 3282875 Electrolytic production of high purity alkali metal hydroxide Patent #: 4025405 InventorsAssigneeApplicationNo. 05/769100 filed on 02/16/1977US Classes:205/531, Foraminous or perforated (e.g., mesh, screen, etc.)205/532Laminated or coatedExaminersPrimary: Andrews, R. L.Attorney, Agent or FirmInternational ClassesC25B 1/00 (20060101)C25B 9/08 (20060101) C08J 5/20 (20060101) C08J 5/22 (20060101) C25B 1/46 (20060101) C25B 9/06 (20060101) AbstractConcentrated alkali metal hydroxide substantially free of alkali metal halide and other impurities is produced by the electrolysis of an alkali metal halide solution in an electrolytic cell having a dimensionally stable anode and a metal cathode separated by an electrically conductive stable selectively permeable hydrated cation ion-exchange membrane film of a fluorinated copolymer having pendant sulfonic acid groups or derivatives of such groups. The membrane film is capable of use at high temperatures and under severely corrosive chemical conditions for extended periods without degradation.Other References
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