US PATENT SUBCLASS 381 / 312
HEARING AIDS, ELECTRICAL

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

312HEARING AIDS, ELECTRICAL {9}
313  DF  .~> Directional
314  DF  .~> Programming interface circuitry
315  DF  .~> Remote control, wireless, or alarm
316  DF  .~> Frequency transposition
317  DF  .~> Noise compensation circuit {1}
319  DF  .~> With vacuum tube amplifier
320  DF  .~> Spectral control
321  DF  .~> Wideband gain control
322  DF  .~> Specified casing or housing {8}

DEFINITION

Classification: 381/312

HEARING AIDS, ELECTRICAL:

(under the class definition) Subject matter having a small ambient sound reproducing system wherein an output transducer transmits directly into the ear or skull for use by the hard of hearing to increase the sound level received by the ear (i.e., listening assistance).

SEE OR SEARCH THIS CLASS, SUBCLASS:

23.1, for hearing aids in binaural and stereophonic circuits and systems.

60, for testing of hearing aids.

74, for headphone circuits.

75, for megaphones.

327, for hearing aids within the scope of this definition in combination with spectacle structure such as temples 370, for a headphone.

SEE OR SEARCH CLASS

73, Measuring and Testing,

585, for ear or hearing testing, and subclasses 645+ for measuring acoustic parameters.

128, Surgery,

746, for testing by auditory stimulus (e.g., audiology)

181, Acoustics,

126+, for mechanical hearing aids.

330, Amplifiers, particularly

65, and 250+ for amplifiers involving structural details or elements, and transistor amplifiers.

351, Optics: Eye Examining, Vision Testing and Correcting,

41+, for spectacles and eyeglasses, and subclasses 111+ for spectacle temples. 600, Surgery,

25, for a surgically implanted vibratory hearing aid

623, Prosthesis (i.e., Artificial Body Members), Parts Thereof or Aids and Accessories Therefor,

10, for artificial ears having electrical hearing aid as a subcombination.