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. 17, 1983
Filed:
Aug. 01, 1980
Applicant:
Inventors:
Dennis K Briefer, Berlin, MA (US);
Michael Flitterman, Berlin, MA (US);
Richard Silverman, Berlin, MA (US);
Assignee:
Granus Corporation, Marlborough, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
1791 / ;
Abstract
This invention utilizes an active diaphragm driven directly by the interaction of a constant magnetic field and a time-varying magnetic field produced by current through electrically conducting elements. A magnet assembly, including a plurality of permanent magnets arranged with like poles adjacent to each other, establishes the magnetic field with respect to the conductive elements to provide highly efficient operation.