Patents by Inventor Yoshiharu Kasuga

Yoshiharu Kasuga 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).

  • Method of producing a piezoelectric resonator
    Patent number: 6961981
    Abstract: The invention concerns a piezoelectric resonator piece of a piezoelectric resonator having electrode patterns for forming exciting electrodes each of which is composed of an under a metal layer. Each of the electrode patterns for forming conduction electrodes is composed of the under metal layer except the curved or bent portions of the sides of the piezoelectric resonator piece and each of the electrode patterns in these portions are composed of the under metal layer and a gold electrode layer. It is thus possible to provide a piezoelectric resonator in which, even when noble metal layers are partially removed for increasing adhesion of surface protecting films, exciting electrodes are not brought into an open state between the upper side and the lower side of a piezoelectric resonator piece.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: November 8, 2005
    Assignee: Seiko Epson Corporation
    Inventors: Mitsuru Nagai, Yoshiharu Kasuga
  • Piezoelectric resonator and method of producing the same
    Publication number: 20040055127
    Abstract: The invention concerns a piezoelectric resonator piece of a piezoelectric resonator having electrode patterns for forming exciting electrodes each of which is composed of an under a metal layer. Each of the electrode patterns for forming conduction electrodes is composed of the under metal layer except the curved or bent portions of the sides of the piezoelectric resonator piece and each of the electrode patterns in these portions are composed of the under metal layer and a gold electrode layer. It is thus possible to provide a piezoelectric resonator in which, even when noble metal layers are partially removed for increasing adhesion of surface protecting films, exciting electrodes are not brought into an open state between the upper side and the lower side of a piezoelectric resonator piece.
    Type: Application
    Filed: September 22, 2003
    Publication date: March 25, 2004
    Applicant: Seiko Epson Corporation
    Inventors: Mitsuru Nagai, Yoshiharu Kasuga
  • Piezoelectric resonator and method of producing the same
    Patent number: 6661162
    Abstract: The invention concerns a piezoelectric resonator piece of a piezoelectric resonator having electrode patterns for forming exciting electrodes each of which is composed of an under a metal layer. Each of the electrode patterns for forming conduction electrodes is composed of the under metal layer except the curved or bent portions of the sides of the piezoelectric resonator piece and each of the electrode patterns in these portions are composed of the under metal layer and a gold electrode layer. It is thus possible to provide a piezoelectric resonator in which, even when noble metal layers are partially removed for increasing adhesion of surface protecting films, exciting electrodes are not brought into an open state between the upper side and the lower side of a piezoelectric resonator piece.
    Type: Grant
    Filed: March 8, 2000
    Date of Patent: December 9, 2003
    Assignee: Seiko Epson Corporation
    Inventors: Mitsuru Nagai, Yoshiharu Kasuga