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. 29, 1994
Filed:
Dec. 20, 1991
Applicant:
Inventor:
George C Tibbetts, Camden, ME (US);
Assignee:
Tibbetts Industries, Inc., Camden, ME (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
367175 ; 367182 ; 381199 ; 381200 ;
Abstract
An electromechanical transducer having permanent magnet means forming a bias field in a region between poles, and a vibratable armature having a first part in that region. The armature has a second part extending from the first part substantially externally of that region. Magnetically permeable structure includes a portion opposing the second part across a transverse gap. The latter structure is included in a closed magnetic loop comprising said first and second parts, a working gap in said region and the transverse gap, and an electrical signal coil is threaded by the loop.