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:
Mar. 31, 1992
Filed:
Nov. 08, 1990
Applicant:
Inventor:
Elmer V Carlson, Prospect Heights, IL (US);
Assignee:
Knowles Electronics, Inc., Itasca, IL (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R / ; H04M / ;
U.S. Cl.
CPC ...
381 686 ; 381 68 ; 381 685 ; 381 687 ; 379 52 ;
Abstract
An ear insertable hearing aid having both a miniature microphone and a magnetic induction pickup which can be used simultaneously or alternately. The invention includes a core for the magnetic induction device that maximizes the surface area usable for sensing changes in magnetic flux but which is yet of a size that can act as a surrounding emplacement for the miniature microphone disposed between the plates of the substantially U-shaped core.