Patents by Inventor Shigenobu Nakaumra

Shigenobu Nakaumra 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).

  • Multi-layer piezoelectric element
    Patent number: 7633214
    Abstract: A multi-layer piezoelectric element having excellent durability in which the amount of displacement does not change even after subjecting to continuous operation over a long period of time under a high voltage and a high pressure is provided. The multi-layer piezoelectric element comprises a stack formed by stacking piezoelectric layers and internal electrodes alternately one on another and external electrodes the proportion of silver contained in electrically conductive material of the internal electrode near the junction with the external electrode is higher than the proportion of silver contained in electrically conductive material of the internal electrode located inside of the stack.
    Type: Grant
    Filed: September 22, 2004
    Date of Patent: December 15, 2009
    Assignee: Kyocera Corporation
    Inventors: Takeshi Okamura, Katsushi Sakaue, Shigenobu Nakaumra
  • Multi-Layer Piezoelectric Element
    Publication number: 20070273251
    Abstract: A multi-layer piezoelectric element having excellent durability in which the amount of displacement does not change even after subjecting to continuous operation over a long period of time under a high voltage and a high pressure is provided.
    Type: Application
    Filed: September 22, 2004
    Publication date: November 29, 2007
    Inventors: Takeshi Okamura, Katsushi Sakaue, Shigenobu Nakaumra