Patents by Inventor Solomon P. Hersh

Solomon P. Hersh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of making fibrous electrets
    Patent number: 4375718
    Abstract: 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 elements on opposite sides of the web. The charging elements are operated at a voltage of from 5 to 25 kV but with opposite polarity.
    Type: Grant
    Filed: March 12, 1981
    Date of Patent: March 8, 1983
    Assignee: Surgikos, Inc.
    Inventors: Larry C. Wadsworth, Solomon P. Hersh