Line in-use indicator for a telephone set and facsimile machine connected to a single telephone line
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 28, 1996
Grant Date -
N/A
app pub date -
Feb 22, 1994
filing date -
Feb 26, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A facsimile apparatus and a telephone set are connected to one telephone line in parallel with each other. A voltage variation .DELTA.V caused by closing and opening of a DC circuit of the telephone set is detected via an off-hook detector of the facsimile apparatus to establish the operation mode of the telephone set. The detected operation mode of the telephone set is stored in a RAM. The detected mode of the telephone set, and thus the closing and opening of the DC circuit of the telephone set, is displayed and/or printed.
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Family
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Cited Art Landscape
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