Patents by Inventor Norihiro Nishio

Norihiro Nishio 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).

  • Porous piezoelectric ceramic sheet and piezoelectric transducer
    Patent number: 6111339
    Abstract: A thin porous piezoelectric Pb(Zr,Ti)O.sub.3 ceramic sheet having a thickness of 0.05 to 2 mm which is favorably employable for manufacturing a piezoelectric transducer has small pores essentially all of which have a size of less than 25 .mu.m in which pores having a size of 5 to 25 .mu.m have a mean pore size of 1/10 to 1/1,000 based on the thickness of the ceramic sheet, and which shows a ratio of apparent density to true density in the range of 5/10 to 9/10.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: August 29, 2000
    Assignee: Ueda Japan Radio Co., Ltd.
    Inventors: Shigemasa Ohya, Kenji Sekimori, Norihiro Nishio