US PATENT SUBCLASS 455 / 31.3
.~.~ Two-way paging system

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

31.1  DF  SYSTEM WITH RECEIVER SELECTION {4}
31.2  DF  .~ Control of selectively responsive paging arrangement over telephone line {1}
31.3.~.~ Two-way paging system

DEFINITION

Classification: 455/31.3

Two-way paging system:

(under subclass 31.2) Subject matter wherein a signal is received back responsive to the transmitted signal.

(1) Note. Two-way voice communication is not classified herein.