Patents by Inventor Ko Yamaoka

Ko Yamaoka 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).

  • Heat-treating process
    Patent number: 5871806
    Abstract: A process for heat-treating an object in a heat-treating apparatus comprises carburizing the object under a carburizing gas atmosphere in a carburizing zone, cooling the object with a cooling gas, and nitriding the object under a nitriding gas atmosphere in a nitriding zone.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: February 16, 1999
    Assignee: Mazda Motor Corporation
    Inventors: Hideo Shoga, Yoshikazu Nagai, Masayuki Suzawa, Hiroshi Nagahama, Ko Yamaoka, Teiji Ogawa, Yoshitugu Kamiya
  • Heat-treating apparatus
    Patent number: 5273585
    Abstract: A heat-treating apparatus comprises zones such as a carburizing zone, a cooling zone, and a nitriding zone, those zones are formed in series by partitioning a continuous passage through doors, and conveyance means for conveying an object along the passage. The cooling zone comprises a forced-feed cooling means for cooling the object by blowing cooling gas.
    Type: Grant
    Filed: March 27, 1991
    Date of Patent: December 28, 1993
    Assignee: Mazda Motor Corporation
    Inventors: Hideo Shoga, Yoshikazu Nagai, Masayuki Suzawa, Hiroshi Nagahama, Ko Yamaoka, Teiji Ogawa, Yoshitugu Kamiya