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:
Nov. 21, 1978
Filed:
Oct. 04, 1977
Applicant:
Inventor:
Harmen Broersma, Amsterdam, NL;
Assignee:
Microtel B.V., Amsterdam, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
1791 / ; 1791 / ;
Abstract
An electro-acoustic transducer in which a diaphragm has a stiffened portion which at the one hand is pivotally connected to a fixed frame portion, and at a location offset from the center of the diaphragm is connected to a U-form armature of an electromagnetic unit at the other, whereby the average amplitude of the movement of said diaphragm caused by a movement of the free end of said armature is greater than the amplitude of the latter movement.