Patents by Inventor Shozo Umetsu

Shozo Umetsu 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 for manufacturing aluminum foils used as electrolytic capacitor electrodes
    Patent number: 5417839
    Abstract: Aluminum foils used as a material of electrodes in electrolytic capacitors are manufactured by a method which comprises a step of forming at first an initial internal oxide coating 5 to 50 .ANG. thick on the surface of the aluminum foils before they are electrochemically or chemically etched later. The aluminum foils are then subjected to high temperature heat treatment such that the whole thickness of the oxide coating does not exceed 70 .ANG..
    Type: Grant
    Filed: August 9, 1994
    Date of Patent: May 23, 1995
    Assignee: Showa Aluminum Corporation
    Inventors: Masashi Sakaguchi, Tadao Fujihira, Kiyoshi Tada, Hisatsugu Nakaya, Shozo Umetsu, Takashi Tamura
  • Aluminum-based alloy foil for negative electrodes of electrolytic capacitors
    Patent number: 4824494
    Abstract: An aluminum-based alloy foil for use as negative electrodes of elecrolytic capacitors, the foil containing 0.1 to 1.0% of Cu, 0.01 to 1.0% of Ni, 0.002 to 0.05% of Ti, and optionally 0.0005 to 0.02% of B, wherein the balance is substantially aluminum.
    Type: Grant
    Filed: February 10, 1988
    Date of Patent: April 25, 1989
    Assignee: Showa Aluminum Kabushiki Kaisha
    Inventors: Shozo Umetsu, Takeshi Nishizaki