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:
Oct. 09, 2012
Filed:
Oct. 16, 2007
Applicants:
Susanne Windischberger, Vienna, AT;
Josef Lutz, Rohrau, AT;
Ewald Frasl, Biedermannsdorf, AT;
Inventors:
Assignee:
Knowles Electronics Asia PTE. Ltd., Singapore, SG;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04R 25/00 (2006.01); H04R 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A compound membrane () for an acoustic device (), the compound membrane () comprising a first layer () and a second layer (), wherein a value of Young's modulus of the second layer () does not vary more than essentially 30% in a temperature range between essentially −20° C. and essentially +85° C.