Patents by Inventor Masahiko Tamura

Masahiko Tamura 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).

  • Rectangular, oriented polymer, piezoelectric diaphragm
    Patent number: 3973150
    Abstract: A piezoelectric electro-acoustic transducer employing as a diaphragm a uniaxially stretched film of a shape having the major axis and the minor axis, wherein the expansion-contraction direction of the diaphragm, in which a piezoelectric constant is at a maximum, is substantially in parallel with the minor axis thereof, whereby the piezoelectric electro-acoustic transducer can provide a high converting efficiency, especially in the low frequency range.
    Type: Grant
    Filed: February 12, 1975
    Date of Patent: August 3, 1976
    Assignee: Pioneer Electronic Corporation
    Inventors: Masahiko Tamura, Kiyonori Iwama, Toshikazu Yoshimi