Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Reexamination Certificate
2004-04-05
2008-09-09
Le, Huyen D (Department: 2615)
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
C381S328000, C381S380000
Reexamination Certificate
active
07424122
ABSTRACT:
A vent configuration for a hearing instrument comprises a vent tube having a length and a vent opening, and at least one cell positioned around the periphery of the vent tube. The at least one cell is closed at a first inner end and open at an outer end, which is adjacent the vent opening. The cell is a tube that extends around the periphery of the vent tube along a portion of the length of the vent tube. A hearing instrument incorporating the vent configuration is also included.
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MacRae, John; “Vents in High-Powered Hearing Aids;” The Hearing Journal; Jan. 1983, pp. 13-16.
European Search Report dated Apr. 5, 2006.
Le Huyen D
Sound Design Technologies, Ltd.
Van Dyke Gardner, Linn & Burkhart, LLP
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