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Larry C Wadsworth, Solomon P Hersh: Method of making fibrous electrets. Surgikos, March 8, 1983: US04375718 (174 worldwide citation)

A process of manufacturing an electrostatically charged filtration medium is disclosed. A web made of nonconductive thermoplastic fibers is contacted on each side with a more conductive web to form a combined web. The combined web is charged with electrically charged particles from corona charging e ...


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