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:
Aug. 08, 1995
Filed:
Feb. 18, 1994
Applicant:
Inventors:
Assignees:
Foster Electric Co., Ltd., , CA;
Mitel Corporation, , CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379437 ; 379433 ; 379451 ; 381 79 ; 381188 ; 381194 ;
Abstract
A receiver including a vibrator plate vibrating together with a voice coil in response to electrification of said voice coil which comprises an electrostatic discharge prevention plate having a central opening arranged above the vibrator plate with a small air gap provided therebetween. A metal cover around the top and sides of the receiver is imbedded in plastic for inhibiting electrostatic discharge via the cover. As a result the discharge path length through the air is substantially increased, reducing the likelihood of electrostatic discharge from the ear of the user.