US PATENT SUBCLASS 381 / FOR 127
HEARING AIDS, ELECTRICAL (381/68)


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

FOR 127HEARING AIDS, ELECTRICAL (381/68) {15}
FOR 128  DF  .~> Directional (381/68.1)
FOR 129  DF  .~> Frequency control (381/68.2)
FOR 130  DF  .~> Bone conduction (381/68.3)
FOR 131  DF  .~> Gain Control (381/68.3)
FOR 132  DF  .~> Spectacle (381/68.5)
FOR 133  DF  .~> Ear insert (381/68.6)
FOR 134  DF  .~> Hook over ear (381/68.7)
FOR 135  DF  .~> Specified casing or housing (381/69) {2}
FOR 138  DF  .~> Having enclosure or housing (381/138) {1}
FOR 140  DD  .~> With acoustic wave modifying structure (381/153) {5}
FOR 147  DD  .~> Microphone (381/168) {2}
FOR 150  DD  .~> Having body supported structure (e.g., earphone) (381/187)
FOR 151  DD  .~> With mounting or support feature (381/188)
FOR 152  DD  .~> Electromagnetic (e.g., dynamic) (381/192) {5}
FOR 165  DD  .~> Electro-acoustical transducer mounting or support (381/205)


DEFINITION

Classification: 381/FOR.127

HEARING AIDS, ELECTRICAL:

Subject matter under the class definition having a small ambient sound reproducing system wherein the 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).