US PATENT SUBCLASS 379 / 361
.~.~.~ Electronic (e.g., tone generator)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


379 /   HD   TELEPHONIC COMMUNICATIONS

350  DF  SUPERVISORY OR CONTROL LINE SIGNALLING {5}
352  DF  .~ Substation originated {8}
360  DF  .~.~ Voice frequency band signalling (e.g., reed devices) {1}
361.~.~.~ Electronic (e.g., tone generator)

DEFINITION

Classification: 379/361

Electronic (e.g., tone generator):

(under subclass 360) Subject matter wherein the signalling tones are produced by an electron discharge device or a semiconductor component.