Patents by Inventor Joshiharu Nakanishi

Joshiharu Nakanishi 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).

  • Electro-acoustic transducer element
    Patent number: 4383194
    Abstract: Electro-acoustic transducer element having its resonant frequency in a lower frequency range advantageously usable for diagnostic purposes comprises a polymeric piezoelectric film such as polyvinylidene fluoride film being coupled with an additional layer having a thickness specified in relation to the wavelength of sound waves within the additional layer at the free resonant frequency of the polymeric piezoelectric film, the additional layer having an acoustic impedance related to the acoustic impedance of the polymeric piezoelectric film.
    Type: Grant
    Filed: April 23, 1980
    Date of Patent: May 10, 1983
    Assignee: Toray Industries, Inc.
    Inventors: Hiroji Ohigashi, Joshiharu Nakanishi, Miyo Suzuki