Patents by Inventor Tohru Takezaki

Tohru Takezaki 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
    Patent number: 7462973
    Abstract: A surface acoustic wave device includes a piezoelectric substrate, at least one interdigital transducer (IDT) provided on the piezoelectric substrate, and a shield electrode provided on the piezoelectric substrate. The IDT has a first pattern on an edge that faces the shield electrode. The shield electrode has a second pattern on an edge so as to be evenly spaced apart from the first pattern.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: December 9, 2008
    Assignee: Fujitsu Media Devices Limited
    Inventors: Hirotada Wachi, Toshifumi Tanaka, Tohru Takezaki, Satoshi Ichikawa, Tsuyoshi Oura, Koichi Wada, Satoshi Orito
  • Filter using piezoelectric material
    Patent number: 7154360
    Abstract: A filter includes a piezoelectric substrate, and interdigital transducers (IDTs) that are formed on the piezoelectric substrate. At least one of the IDTs has a main electrode finger pattern that is weighted. The IDT having the main electrode finger pattern also has a sub electrode finger pattern that is connected in parallel to the main electrode finger pattern, and generates a surface acoustic wave that cancels a surface acoustic wave caused by leakage electric fields generated in the main electrode finger pattern.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: December 26, 2006
    Assignee: Fujitsu Media Devices Limited
    Inventors: Koichi Wada, Satoshi Ichikawa, Hirotada Wachi, Tohru Takezaki, Tsuyoshi Oura, Toshifumi Tanaka, Satoshi Orito
  • Filter using piezoelectric material
    Publication number: 20050093660
    Abstract: A filter includes a piezoelectric substrate, and interdigital transducers (IDTs) that are formed on the piezoelectric substrate. At least one of the IDTs has a main electrode finger pattern that is weighted. The IDT having the main electrode finger pattern also has a sub electrode finger pattern that is connected in parallel to the main electrode finger pattern, and generates a surface acoustic wave that cancels a surface acoustic wave caused by leakage electric fields generated in the main electrode finger pattern.
    Type: Application
    Filed: September 28, 2004
    Publication date: May 5, 2005
    Inventors: Koichi Wada, Satoshi Ichikawa, Hirotada Wachi, Tohru Takezaki, Tsuyoshi Oura, Toshifumi Tanaka, Satoshi Orito
  • Surface acoustic wave device
    Publication number: 20050093395
    Abstract: A surface acoustic wave device includes a piezoelectric substrate, at least one interdigital transducer (IDT) provided on the piezoelectric substrate, and a shield electrode provided on the piezoelectric substrate. The IDT has a first pattern on an edge that faces the shield electrode. The shield electrode has a second pattern on an edge so as to be evenly spaced apart from the first pattern.
    Type: Application
    Filed: October 1, 2004
    Publication date: May 5, 2005
    Inventors: Hirotada Wachi, Toshifumi Tanaka, Tohru Takezaki, Satoshi Ichikawa, Tsuyoshi Oura, Koichi Wada, Satoshi Orito