Patents by Inventor Masazumi Shigematsu

Masazumi Shigematsu 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).

  • Molding method
    Patent number: 4781744
    Abstract: A mold capable of imparting uniform transparency to the calcium phosphate type crystallized glass, in which crystals of calcium metaphosphate are present at the shaping surface of the mold which comes into contact with the material to be shaped.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: November 1, 1988
    Assignees: Asahi Glass Company Ltd., Lion Corporation
    Inventors: Shigeyoshi Kobayashi, Tsuneo Manabe, Masazumi Shigematsu, Yasuko Osaki, Shoji Watanabe, Tohoru Sema