Patents by Inventor Munestugu Ueyama

Munestugu Ueyama 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 preparing bismuth oxide superconductor
    Patent number: 5840660
    Abstract: Raw material powder for a bismuth oxide superconductor is molded with addition of an organic vehicle, and the molded raw material is heat treated for removing the organic vehicle before the molded raw material is metal-coated. In this heat treatment, conditions not more than those expressed as T=-1.5.times.logH+600 are applied as to relation between temperature (T) and time (H). Thus, phase transformation of 2212 phases mainly composing the raw material is suppressed so that a large amount of 2223 phases having a relatively high critical temperature are formed when heat treatment is performed after metal coating.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: November 24, 1998
    Assignees: E.I. Du Pont De Nemours And Company, Sumitomo Electric Industries, Ltd.
    Inventors: Munestugu Ueyama, Kenichi Sato, George E. Zahr