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:
May. 07, 2013
Filed:
Jun. 20, 2008
Applicant:
Ewald Frasl, Biedermannsdorf, AT;
Inventor:
Ewald Frasl, Biedermannsdorf, AT;
Assignee:
Knowles Electronics Asia PTE. Ltd., Singapore, SG;
Primary Examiner:
Int. Cl.
CPC ...
H04R 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A membranefor an acoustic deviceis provided, the membrane, wherein the membranecomprises a central portion, an annular portion, and a corrugation, wherein the annular portionis arranged around the central portion, wherein the annular portionis adapted to be fixed to a coil, and wherein the corrugationis arranged between the central portionand the annular portion. Thus, the corrugationmay form an inner corrugation compared to an outer corrugationwhich would be arranged farther away from the central portionthan the annular portion