Patents by Inventor Emi Shimomura

Emi Shimomura 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).

  • Piezoelectric ceramic and piezoelectric element
    Patent number: 7965020
    Abstract: A piezoelectric ceramic which has a large value of coercive electric field and, in addition, which can be fired at low temperatures of 950° C. or lower, is provided. It has a composition represented by Pbx-a-dBiaM3d{M1b(M21/3Nb2/3)yZr1-b-y-zTiz}O3 where M1 and M2 represent, independently, at least one of Ni and Zn, and M3 represents at least one of Ba and Sr, 0.05?a?0.15, 0<b?0.075, 0?(a?2b), 0?d?0.1, 0.97?x?1.00, 0.020?y?0.250, and 0.398?z?0.512. It is preferable that M1 represents Ni, and M2 represents at least one of Ni and Zn. Moreover, it is preferable that Ni is in the state of being segregated.
    Type: Grant
    Filed: April 20, 2009
    Date of Patent: June 21, 2011
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Chiharu Sakaki, Emi Shimomura, Motoyoshi Sakai, Motonori Nakamura
  • Piezoelectric Ceramic and Piezoelectric Element
    Publication number: 20090200898
    Abstract: A piezoelectric ceramic which has a large value of coercive electric field and, in addition, which can be fired at low temperatures of 950° C. or lower, is provided. It has a composition represented by Pbx-a-dBiaM3d{M1b(M21/3Nb2/3)yZr1-b-y-zTiz}O3 where M1 and M2 represent, independently, at least one of Ni and Zn, and M3 represents at least one of Ba and Sr, 0.05?a?0.15, 0<b?0.075, 0?(a?2b), 0?d?0.1, 0.97?x?1.00, 0.020?y?0.250, and 0.398?z?0.512. It is preferable that M1 represents Ni, and M2 represents at least one of Ni and Zn. Moreover, it is preferable that Ni is in the state of being segregated.
    Type: Application
    Filed: April 20, 2009
    Publication date: August 13, 2009
    Inventors: Chiharu Sakaki, Emi Shimomura, Motoyoshi Sakai, Motonori Nakamura