Patents by Inventor Hasaya Miyake

Hasaya Miyake 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).

  • Method of producing a silicon nitride based sintered body
    Patent number: 5698156
    Abstract: Provided herein is a me silicon nitride based sintered body composed only of uniform, fine crystal grains, and improved in both strength and fracture toughness in the middle and low temperature ranges. The crystalline silicon nitride powder thus produced is composed of crystal grains whose longer-axis diameter is not more than 200 nm or an amorphous silicon nitride powder is used as material powder. According to the disclosed method, the silicon nitride powder is sintered at a temperature of 1200.degree. C. to 1400.degree. C. or sintered with a product of sintering temperature (.degree. C.) and sintering time (sec) below 600000 (.degree. C. sec) at a temperature of 1400.degree. C. to 1900.degree. C. By this method, a silicon nitride based sintered body in which the longer-axis diameter of silicon nitride and/or sialon crystals is not more than 200 nm is obtained.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: December 16, 1997
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takashi Matsuura, Akira Yamakawa, Hasaya Miyake