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:
Aug. 22, 1989
Filed:
Aug. 20, 1987
Applicant:
Inventors:
Ernst Payer, Puchheim, DE;
Hans Schierl, Steinhoering, DE;
Assignee:
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R / ; H04R / ;
U.S. Cl.
CPC ...
381159 ; 381205 ; 381188 ;
Abstract
An acoustic transducer has two partially annular resonators arranged in an ante-chamber of a transducer plate, the resonators being formed by annular channels which are provided in an upper housing component which are sealed from the exterior by a covering plate. The channels are linked to the ante-chamber of the transducer plate through openings.