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:
Jun. 16, 2009
Filed:
Mar. 12, 2007
Jared Brosch, Cicero, IN (US);
Grant Adam Morris, North Salem, IN (US);
Jared Brosch, Cicero, IN (US);
Grant Adam Morris, North Salem, IN (US);
Piezotech, LLC, Indianapolis, IN (US);
Abstract
A piezoelectric buzzer includes a vibrating layer capable of withstanding temperatures in excess of 260° C. for at least five minutes while still maintaining its ability to vibrate and produce a buzzing sound at a level of at least 80 dB, and a high temperature piezoelectric material having a Curie temperature in excess of 260° C. and one or more of the following properties: a planar coupling coefficient (k) of at least about 0.5; a longitudinal coupling coefficient (k) of at least about 1500; and a mechanical quality factor (Q) of at least about 2000. The piezo material may have a combination of these properties such that the product (k)(k)(Q) is at least about 1.5×10. The piezoelectric material may have a base formula of PbSr(MnSb)(ZrTi)Owith x ranging from 0.95 to 0.99, y ranging from 0.92 to 0.97, and z ranging from 0.45 to 0.55, and may further include dopants in the amounts of about 0.4% CeO, about 1% CuO, and about 4% NbO.