Patents by Inventor Tatsuya Shiogai

Tatsuya Shiogai 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).

  • Process for producing .beta.-sialon based sintered bodies
    Patent number: 5302329
    Abstract: The present invention is a process for producing .beta.-sialon based sintered bodies having a fracture toughness (K.sub.IC) of at least 6.5 MPam.sup.1/2.The process comprises preparing a feed that consists of 0.5-20 wt % of a sintering aid (e.g. MgO) with an average particle size of no more than 5.0 .mu.m, 3-40 wt % of an additive (e.g. SiC) with an average particle size of no more than 5.0 .mu.m, with the remainder being a .beta.-sialon powder having an average particle size of no more than 2.0 .mu.m, wet mixing the individual feeds to form a slurry, drying the slurry and sintering the dried slurry.
    Type: Grant
    Filed: October 21, 1991
    Date of Patent: April 12, 1994
    Assignee: Nihon Cement Co., Ltd.
    Inventors: Tatsuya Shiogai, Yoshitsugu Nishi, Chitake Yamagishi