Headphone device

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers

Reexamination Certificate

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Details

C381S370000, C381S373000

Reexamination Certificate

active

07983438

ABSTRACT:
A headphone unit including a back housing provided at the rear of a driver unit and a baffle portion provided at the front thereof. In the headphone apparatus, the baffle portion, which is formed to surround a space except a front opening portion of a driver unit, and/or the back housing portion, which is formed to cover the back surface of the driver unit, are formed using the air-permeable porous material.

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patent: 3220505 (1965-11-01), Hargrave
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patent: 4058688 (1977-11-01), Nishimura et al.
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patent: 4654898 (1987-04-01), Ishikawa
patent: 4922542 (1990-05-01), Sapiejewski
patent: 6466681 (2002-10-01), Siska et al.
patent: 6856690 (2005-02-01), Skulley
patent: 7311957 (2007-12-01), Bargo, II
patent: 7466838 (2008-12-01), Moseley
patent: 2003/0134553 (2003-07-01), Sheffer
patent: 5-36991 (1993-05-01), None
patent: 10-32892 (1998-02-01), None
patent: 11-331972 (1999-11-01), None
patent: 2004-32645 (2004-01-01), None

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