Patents by Inventor Kojiro Akagawa

Kojiro Akagawa 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).

  • Metallic material for flutes
    Patent number: 4971759
    Abstract: In the composition of a Ag alloy type material used for production of flutes, a specified amount of at least one of Ni, Fe, Co and Cr or at least one of Mn, Ti, Zi and Si is added to suppress softening and crystal grain size coarsening caused by annealing in production. Thus, flutes which generate brilliant sounds in mid to high notes can be obtained by using the above material.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: November 20, 1990
    Assignee: Yamaha Corporation
    Inventors: Osamu Watanabe, Takashi Nara, Kojiro Akagawa, Kuniaki Nomata