Patents by Inventor Kiyoshi Okawachi

Kiyoshi Okawachi 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).

  • High corrosion resisting alloy for diesel engine valve and method for producing the valve
    Patent number: 6139660
    Abstract: A high corrosion resisting alloy for use in inlet and exhaust valves of diesel engines which is low in cost and excellent in corrosion resistance and strength, which consists by weight percentage of C.ltoreq.0.1%, Si.ltoreq.1.0%, Mn.ltoreq.1.0%, 25%<Cr.ltoreq.32%, 2.0%<Ti.ltoreq.3.0%, 1.0%.ltoreq.Al.ltoreq.2.0% and the balance being Ni and incidental impurities. The valves for the diesel engines are manufactured through the steps of forging the above-mentioned alloy into near net shapes of the valves, performing aging treatment (after solid solution treatment according to demand), and further enhancing hardness of the valves at their valve faces locally through partial cold forging.
    Type: Grant
    Filed: January 5, 2000
    Date of Patent: October 31, 2000
    Assignees: Daido Tokushuko Kabushiki Kaisha, Nittan Valvle Co., Ltd.
    Inventors: Tomotaka Nagashima, Michio Okabe, Toshiharu Noda, Kiyoshi Okawachi
  • High corrosion resisting alloy for diesel engine valve
    Patent number: 6039919
    Abstract: A high corrosion resisting alloy for use in inlet and exhaust valves of diesel engines which is low in cost and excellent in corrosion resistance and strength, which consists by weight percentage of C.ltoreq.0.1%, Si.ltoreq.1.0%, Mn.ltoreq.1.0%, 25%<Cr.ltoreq.32%, 2.0%<Ti.ltoreq.3.0%, 1.0%.ltoreq.Al.ltoreq.2.0% and the balance being Ni and incidental impurities. The valves for the diesel engines are manufactured through the steps of forging the above-mentioned alloy into near net shapes of the valves, performing aging treatment (after solid solution treatment according to demand), and further enhancing hardness of the valves at their valve faces locally through partial cold forging.
    Type: Grant
    Filed: February 3, 1998
    Date of Patent: March 21, 2000
    Assignees: Daido Tokushuko Kabushiki Kaisha, Nittan Valve Co., Ltd.
    Inventors: Tomotaka Nagashima, Michio Okabe, Toshiharu Noda, Kiyoshi Okawachi