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:
Sep. 14, 1999
Filed:
Nov. 10, 1997
Denis Abraham, Vanves, FR;
Stephane Dufosse, Cormeilles En Parisis, FR;
Alcatel, Paris, FR;
Abstract
A telephone handset includes a housing containing an earpiece part including a piezo-electric disk joined to an electrically conductive support disk, the edge of the support disk being clamped between two holding parts and separating a rear volume from a front volume. The rear volume is delimited by the combination of the piezo-electric disk and its support disk and by a rear wall facing this combination and a circular lateral wall, the rear wall and the lateral wall constituting a rear part with micro-leaks to constitute with the rear volume an acoustic damper device. The front volume, on the other side of the aforementioned combination constitutes, with holes in a wall of the front volume facing the latter combination, a Helmoltz resonator. The housing further contains a board supporting electronic components in direct contact with the rear wall of the rear volume.