Patents by Inventor Etsuro Nakao

Etsuro Nakao 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 manufacturing an electret filter
    Patent number: 4592815
    Abstract: The disclosed method provides an electret filter having a permanent electrostatic charge and formed of polymer fibers having an intrinsic viscosity of 1.5 or less. Fibers of the requisite viscosity are formed into a non-woven fabric and fed, at room temperature, through a gap between a discharge electrode and a ground electrode while being tightly pressed against the ground electrode. The ground electrode preferrably presents a polished metal surface for contact with the web.
    Type: Grant
    Filed: February 6, 1985
    Date of Patent: June 3, 1986
    Assignee: Japan Vilene Co., Ltd.
    Inventor: Etsuro Nakao
  • Electrode separator for an electric cell
    Patent number: 4551402
    Abstract: A mat of filaments for an electrode separator of an electric cell has filaments having segments of 2-4 microns in diameter and segments of 10-30 microns in diameter to provide appropriate electrical and stiffness properties.
    Type: Grant
    Filed: November 16, 1983
    Date of Patent: November 5, 1985
    Assignee: Firma Carl Freudenberg
    Inventors: Tadashi Tamura, Etsuro Nakao, Hiroaki Yamazaki