Earphone set

Details Earphone set Earphone set

2006-04-25

2006-04-25

Tran, Sinh (Department: 2646)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Plural or compound reproducers

C381S374000, C381S378000

Reexamination Certificate

active

07035421

ABSTRACT:
An earphone set includes two earphones and a connecting device. Each of the earphones has a sound output device respectively. The connecting device is connected to the two earphones. It is characterized in that the two earphones output sound signals in the same direction.

REFERENCES:
patent: 220839 (1879-10-01), Hubbard
patent: 2337953 (1943-12-01), Wirsching
patent: 2586644 (1952-02-01), Gilbert
patent: 4058688 (1977-11-01), Nishimura et al.
patent: 6483925 (2002-11-01), Shen et al.
patent: 6707924 (2004-03-01), Okiebisu
patent: 53023601 (1978-03-01), None

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