US PATENT SUBCLASS 178 / 63 R
.~ Cable or capacity

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

2 R  DF  SYSTEMS {21}
63 R.~ Cable or capacity {6}
63 A  DF  .~.~> Cable repeaters
63 B  DF  .~.~> Cable transmitters
63 C  DF  .~.~> Cable receivers
63 D  DF  .~.~> Cable mechanical structure
63 E  DF  .~.~> Distortion correction and artificial lines
63 F  DF  .~.~> Direction reversing

Unofficial Alpha Subclasses: R A B C D E F

DEFINITION

Classification: 178/63

(under subclass 2) Systems adapted to the transmission of code signals over cables or long lines, involving large electric capacity and usually characterized by the use of reversals of current in transmission, clearing line, eliminating "tailings", static compensation, etc.; also because of analogy of means all current reversing telegraph systems not otherwise classifiable.

SEE OR SEARCH THIS CLASS, SUBCLASS:

16, for automatic current reversing systems.

44, for wave transmitting systems having means to diminish or prevent distortion or attenuation, and especially applicable to long lines, cables, and systems involving large capacity or inductances.

55+, for quadruplex systems.

58+, for duplex systems.

69, for line clearing systems, per se. SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks,

12, for transmission line inductive or radiation interference reduction systems, and subclass 23 for artificial lines simulating cable lines.

375, Pulse or Digital Communications,

257, for cable systems and components.