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. 26, 1990
Filed:
Jul. 20, 1988
Applicant:
Inventors:
Cyrus N Ashtiani, Pittsburgh, PA (US);
Zoltan J Cendes, Pittsburgh, PA (US);
Assignee:
Richards Medical Company, Memphis, TN (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61N / ;
U.S. Cl.
CPC ...
1284206 ; 1284205 ; 600 25 ; 600 27 ; 600 12 ; 381 68 ;
Abstract
A shielded magnetic assembly for use in a magnetic hearing aid is described. The shielded assembly uses a disc-shaped magnet with a high permeability, low coercivity material placed on the face of the magnet away from the air gap. Preferably, the shielding material also covers portions of the edge of the magnet to form a cap. The shielding focuses the magnet's energy into the air gap to improve coupling and reduce interference from external magnetic fields.