Anisotropic polyvinyl formal resin microporous membrane and its preparation
 A microporous membrane having a thin surface skin and a cellular body is described. The membrane is effective for separating soluble oils, proteins and other substances having large molecular weights from water or other carriers by means of the ultrafiltration process or for removing salts from liquids by means of the electrodialysis process. 
Aqua-Chem, Inc.
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Donald G. J.
Wang