Patents by Inventor Yoshio Hayama

Yoshio Hayama 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).

  • Toy piano
    Patent number: D255370
    Type: Grant
    Filed: October 31, 1977
    Date of Patent: June 10, 1980
    Assignee: Emix Corporation
    Inventors: Yoshio Hayama, Humiuki Kurita, Sozen Uozumi
  • Toy piano
    Patent number: D258899
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: April 14, 1981
    Assignee: Emix Corporation
    Inventors: Yoshio Hayama, Sozen Uozumi, Fumiyuki Kurita