Patents by Inventor Masakatu Hayakawa

Masakatu Hayakawa 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).

  • Sintered body assembly formed from a plurality of independent compacts and method of producing same
    Patent number: 4907330
    Abstract: A sintered body assembly having an inner section and an outer section is formed from independent inner and outer compacts corresponding to the inner and outer sections, respectively. The inner and outer compacts are so shaped that a predetermined clearance is provided therebetween. The outer compact is larger in shrinkage percentage at the time of sintering than the inner compact such that the clearance is filled by the compacts at the time of sintering thereby allowing the compacts to be formed into a single sintered body or an integral unit.
    Type: Grant
    Filed: June 6, 1988
    Date of Patent: March 13, 1990
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Shigeaki Akao, Masakatu Hayakawa, Mitsuyoshi Kawamura