US PATENT SUBCLASS 379 / 93.37
.~.~.~ Having acoustic link

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

90.01  DF  TELEPHONE LINE OR SYSTEM COMBINED WITH DIVERSE ELECTRICAL SYSTEM OR SIGNALLING (E.G., COMPOSITE) {8}
93.01  DF  .~ Having transmission of a digital message signal over a telephone line {9}
93.26  DF  .~.~ By voice frequency signal (e.g., tone code) {3}
93.37.~.~.~ Having acoustic link

DEFINITION

Classification: 379/93.37

Having acoustic link:

(under subclass 93.26) Subject matter wherein a digital signalling device is connected to a telephone line by a sound wave passing between a complementary pair of electroacoustic transducers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

78, for an acoustic link between a telephone answering device and a telephone line.

444, for a telephone acoustic coupler, per se.