Patents by Inventor Isao Nakatsugawa

Isao Nakatsugawa 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).

  • MAGNESIUM ALLOY, MAGNESIUM ALLOY PLATE, MAGNESIUM ALLOY BAR, MANUFACTURING METHODS THEREOF, AND MAGNESIUM ALLOY MEMBER
    Publication number: 20230183843
    Abstract: Provided is a magnesium alloy in which Cu content is 0 to 1.5% by mass, Ni content is 0 to 0.5% by mass, Ca content is 0.05 to 1.0% by mass, Al content is 0 to 0.5% by mass, Zn content is 0 to 0.3% by mass, Mn content is 0 to 0.3% by mass, Zr content is 0 to 0.3% by mass, the total of the Cu content and the Ni content being 0.005% by mass to 2.0% by mass, and the balance being magnesium and unavoidable impurities.
    Type: Application
    Filed: April 6, 2021
    Publication date: June 15, 2023
    Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Mingzhe BIAN, Xinsheng HUANG, Yasumasa CHINO, Isao NAKATSUGAWA
  • Magnesium coating solution and method for preparing the same
    Patent number: 7964030
    Abstract: A vanadate solution for conversion treating of surface of a magnesium alloy workpiece contains 8.20×104 to 8.20×10?2 mol/liter of metavanadate ion, 1.18×104 to 1.18×10?2 mol/liter of a polyhydroxylated aromatic compound, and balance of water. The pH value of the vanadate solution exceeds 1 and is less than 4. A method for preparing the vanadate solution is also provided.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: June 21, 2011
    Assignees: Fu Zhun Precision Industry (Shen Zhen) Co., Ltd., Foxconn Technology Co., Ltd.
    Inventors: Isao Nakatsugawa, Wu-Bin Li, Bin-Lung Ou
  • Cathodic protective coating on magnesium or its alloys
    Patent number: 6291076
    Abstract: A method is provided for treating a magnesium-containing article to form a cathodic protective coating on such article. This is done by electrochemically treating the article, acting as a cathode, in an alkaline solution, preferably at a temperature of between 40 and 80° C., with a cathodic current density of 5-200 mA/cm2. The treatment produces a magnesium-containing article having a protective coating of magnesium hydride of predetermined thickness with a high count of hydrogen particles.
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: September 18, 2001
    Assignee: Technologies Intermag Inc.
    Inventor: Isao Nakatsugawa
  • Cathodic protective coating on magnesium or its alloys and method of producing the same
    Patent number: 6117298
    Abstract: A method is provided for treating a magnesium-containing article to form a cathodic protective coating on such article. This is done by electrochemically treating the article, acting as a cathode, in an alkaline solution, preferably at a temperature of between 40 and 80.degree. C., with a cathodic current density of 5-200 mA/cm.sup.2. The treatment produces a magnesium-containing article having a protective coating of magnesium hydride of predetermined thickness with a high count of hydrogen particles.
    Type: Grant
    Filed: October 16, 1998
    Date of Patent: September 12, 2000
    Assignee: Technologies Intermag Inc.
    Inventor: Isao Nakatsugawa