The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 1993
Filed:
Dec. 02, 1991
Hisao Banno, Nagoya, JP;
Kohji Ogura, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A high d.sub.h piezoelectric composite material useful for utilization for hydrophones is disclosed which includes a matrix of an organic polymeric material and two different inorganic piezoelectric powders dispersed in the matrix. One of the piezoelectric powders has a large .vertline.d.sub.31 /d.sub.33 .vertline. value, such as lead titanate zirconate, and the other piezoelecctric powder has a low .vertline.d.sub.31 /d.sub.33 .vertline. value, such as lead titanate. The average particle size of one of the two piezoelectric powders is at least two times that of the other. The total amount of the two piezoelectric powders is 65-75% by volume based on the total volume of the matrix and the two piezoelectric powder. The volume ratio of the high .vertline.d.sub.31 /d.sub.33 .vertline. piezoelectric powder to the low .vertline.d.sub.31 /d.sub.33 .vertline. piezoelectric powder is in the range of 3:2 to 9:1.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile