Patents by Inventor Hiroshi Kurotake

Hiroshi Kurotake 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).

  • Surface acoustic wave device and electronic component comprising it
    Patent number: 7030539
    Abstract: In a surface acoustic wave device, a common portion and a strip portion of a reflector electrode are partially cut off to increase a space between the electrodes. The increase of the space between the electrodes reduces the influence of the amount of charges and the influence of an unbalance between the amounts of charges in etching of a metallic film, thereby preventing the electrodes from having a curved shape in section. Consequently, the surface acoustic wave device has a reduced propagation loss.
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: April 18, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuhiro Furukawa, Kiyoharu Yamashita, Kazushi Nishida, Hiroshi Kurotake
  • Surface acoustic wave device, electronic component using the device, and composite module
    Patent number: 6937114
    Abstract: A surface acoustic wave device includes a piezoelectric substrate and an electrode provided on the substrate. The electrode includes a first metal layer provided on the piezoelectric substrate and having a trapezoid shape in the cross section and a second metal layer provided over the piezoelectric substrate at the same position as the first metal layer over the piezoelectric substrate. By controlling the shape of side surfaces of the electrode, the surface acoustic wave device hardly vary in a propagation frequency.
    Type: Grant
    Filed: December 25, 2002
    Date of Patent: August 30, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuhiro Furukawa, Kiyoharu Yamashita, Hiroshi Kurotake, Hiroyoshi Sekiguchi
  • Surface acoustic wave device, electronic component using the device, and composite module
    Publication number: 20040070313
    Abstract: A surface acoustic wave device includes a piezoelectric substrate and an electrode provided on the substrate. The electrode includes a first metal layer provided on the piezoelectric substrate and having a trapezoid shape in the cross section and a second metal layer provided over the piezoelectric substrate at the same position as the first metal layer over the piezoelectric substrate. By controlling the shape of side surfaces of the electrode, the surface acoustic wave device hardly vary in a propagation frequency.
    Type: Application
    Filed: August 27, 2003
    Publication date: April 15, 2004
    Inventors: Mitsuhiro Furukawa, Kiyoharu Yamashita, Hiroshi Kurotake, Hiroyoshi Sekiguchi
  • Surface acoustic wave device and electronic component comprising it
    Publication number: 20040046482
    Abstract: In a surface acoustic wave device, a common portion and a strip portion of a reflector electrode are partially cut off to increase a space between the electrodes. The increase of the space between the electrodes reduces the influence of the amount of charges and the influence of an unbalance between the amounts of charges in etching of a metallic film, thereby preventing the electrodes from having a curved shape in section. Consequently, the surface acoustic wave device has a reduced propagation loss.
    Type: Application
    Filed: September 22, 2003
    Publication date: March 11, 2004
    Inventors: Mitsuhiro Furukawa, Kiyoharu Yamashita, Kazushi Nishida, Hiroshi Kurotake