Electrolytic production of high purity alkali metal hydroxide
Patent 4025405 Issued on May 24, 1977. Estimated Expiration Date: 
May 24, 1994. 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.
May 24, 1994. 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 3282875 3657104 3663414 3684543 3694281 3718551 InventorsAssigneeApplicationNo. 05/191424 filed on 10/21/1971US Classes:205/512, Potassium hydroxide produced204/258, Gas204/296, Organic205/516, And elemental halogen produced205/524Diaphragm or membrane having nonelectrode layer bonded thereto or embedded thereinExaminersPrimary: Andrews, R. L.Attorney, Agent or FirmAbstractConcentrated 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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