Patent · US Expired

Leak-tolerant handsfree telephone

US7139394B2 · kind B2 · utility

2Cited by

6References

52Claims

0Family size

Assignee

TCL COMMUNICATION TECHNOLOGY HOLDINGS LIMITED · CN

Inventors

Stephane Dufosse · Cormeilles-en-Parisis, FR
Nicolas Janaszek · Anhiers, FR

Key dates

Filing date	Mar 19, 2002
Grant date	Nov 21, 2006
Priority date	—
Expiry date	Mar 23, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH04M1/6041
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

To amplify low frequencies emitted in handsfree mode by a multifunction earpiece (earpiece, loudspeaker, buzzer) of a telephone handset, the earpiece being tolerant to leaks in a discreet mode of operation, a tube projects into a cavity in the casing of the handset, around an aperture through which the cavity communicates with the exterior of the casing. The handset thus includes a multifunction earpiece that is tolerant of leaks in a discreet mode of operation and provides good sound quality in handsfree mode.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.