Patents by Inventor Sigeru Iijima

Sigeru Iijima 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 highly ion-conductive porcelain
    Patent number: 4082826
    Abstract: A process for producing a highly ion-conductive porcelain having superior stability, which comprises (a) mixing about 87 to about 95% by weight of Al.sub.2 O.sub.3 with about 5 to about 13% by weight, as Na.sub.2 O, of a sodium salt; (b) heat-treating the mixture at a temperature of not more than about 1500.degree. C in an oxidizing atmosphere to produce a powder whose X-ray powder diffraction pattern has a .beta.-Al.sub.2 O.sub.3 /.beta."-Al.sub.2 O.sub.3 ratio such that the ratio of I.beta.:I.beta." is about 1.0:1 to about 0.25:1 where I.beta. is the peak intensity of .beta.-Al.sub.2 O.sub.3 in the (017) planes with d=2.69 A and I.beta." is the peak intensity of .beta."-Al.sub.2 O.sub.3 in the (01,11) planes with d=2.
    Type: Grant
    Filed: May 19, 1977
    Date of Patent: April 4, 1978
    Assignee: NGK Spark Plug Co., Ltd.
    Inventor: Sigeru Iijima