Patents by Inventor Yuichi Heishi

Yuichi Heishi 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).

  • Nitrided maraging steel and method of manufacture thereof
    Patent number: 6733600
    Abstract: A maraging steel is subjected to the aging to have a hardness of more than 500 Hv. A nitrided case is formed to have a depth that is about 20% to 50% to a ½ thickness of the maraging steel plate. An endless ring for a metal belt is constructed by the above maraging steel. According to methods of manufacturing the maraging steel and the endless ring, the nitrided case having the depth that is 20% to 50% of a distance from a plate surface to a center can be formed by executing an aging to have the hardness of more than 500 Hv, then executing a nitriding in the nitrogen atmosphere to which organic chloride is added.
    Type: Grant
    Filed: July 18, 2001
    Date of Patent: May 11, 2004
    Assignees: Nissan Motor Co., Ltd., Dowa Mining Co., Ltd.
    Inventors: Yuichi Heishi, Masahiro Suzuki, Ikuo Tani, Youichi Watanabe, Shunzou Umegaki, Kiyotaka Akimoto, Keiji Yokose
  • Nitrided maraging steel and method of manufacture thereof
    Publication number: 20020014281
    Abstract: A maraging steel is subjected to the aging to have a hardness of more than 500 Hv. A nitrided case is formed to have a depth that is about 20% to 50% to a ½ thickness of the maraging steel plate. An endless ring for a metal belt is constructed by the above maraging steel. According to methods of manufacturing the maraging steel and the endless ring, the nitrided case having the depth that is 20% to 50% of a distance from a plate surface to a center can be formed by executing an aging to have the hardness of more than 500 Hv, then executing a nitriding in the nitrogen atmosphere to which organic chloride is added.
    Type: Application
    Filed: July 18, 2001
    Publication date: February 7, 2002
    Inventors: Yuichi Heishi, Masahiro Suzuki, Ikuo Tani, Youichi Watanabe, Shunzou Umegaki, Kiyotaka Akimoto, Keiji Yokose