1982-11-26
1984-04-03
Pellinen, A. D.
179 99H, H04M 100
Patent
active
044409818
ABSTRACT:
In a hold circuit connectable to a subscriber telephone line, a silicon controlled rectifier is turned on by a user operated momentary pushbutton connecting the positive side of the line to the hold circuit. A comparator circuit sensing the initial value of the loop voltage, turns on a transistor and connects a line seizing network across the subscriber line.
REFERENCES:
patent: 4001520 (1977-01-01), Waldman et al.
patent: 4011413 (1977-03-01), Phillips
patent: 4093829 (1978-06-01), Silberman
patent: 4258232 (1981-03-01), Smith et al.
patent: 4365117 (1982-12-01), Curtis
patent: 4387274 (1983-06-01), Stein et al.
patent: 4394543 (1983-07-01), Keiper, Jr. et al.
patent: 4394544 (1983-07-01), De Leon
Boeckmann Eduard F. B.
Grantland Gary
Montgomery Hugh S.
Woodworth Larry A.
George Keith E.
GTE Automatic Electric Inc.
Miologos Anthony
Pellinen A. D.
Xiarhos Peter
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