Speakerbox

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having acoustic wave modifying structure

Reexamination Certificate

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Details

C381S337000, C455S350000

Reexamination Certificate

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07925035

ABSTRACT:
An electro-acoustic communications unit (20) may include an acoustic driver (22) which, when operated, emits acoustic waves in two directions. A hermetically sealed container (24) attached to the acoustic driver may include a gas other than air. The gas may transport acoustic waves generated by the acoustic driver.

REFERENCES:
patent: 2797766 (1957-07-01), Sullivan
patent: 3549829 (1970-12-01), Heidrich
patent: 3554313 (1971-01-01), Young
patent: 4101736 (1978-07-01), Czerwinski
patent: 4356882 (1982-11-01), Allen
patent: 4823907 (1989-04-01), Hoshi
patent: 6381337 (2002-04-01), Greenberg
patent: 2002/0110258 (2002-08-01), Pol
patent: 2004/0136560 (2004-07-01), Walsh
PCT Search Report and Written Opinion, Jan. 15, 2007, 11 pages.

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