Patents by Inventor Syuusaku Ueda

Syuusaku Ueda 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 production of nitride ceramic shapes
    Patent number: 5006491
    Abstract: There is first prepared a mixture of a nitride ceramic material (e.g. aluminum nitride) and a sintering aid (e.g. calcium carbonate), both in finely divided form. Admixed with a binder, the mixture is pressed into moldings of desired shape. The moldings are sintered to maturity in a nitrogenous atmosphere. The sintered moldings are subsequently aftertreated by being exposed to fluorine or its compound at a reduced temperature in the range of, typically, 1000.degree. to 1600.degree. C. The aftertreatment eliminates undesired intergranular substances from the sintered moldings and thus improves their thermal conductivity.
    Type: Grant
    Filed: March 21, 1989
    Date of Patent: April 9, 1991
    Assignee: Taiyo Yuden CO., Ltd.
    Inventors: Syuusaku Ueda, Masayuki Fujimoto