1943-07-17
1976-02-10
Wilbur, Maynard R.
179 15R, H04K 106
Patent
active
039378888
ABSTRACT:
1. In a privacy system in which the signals are divided into fragments on a time basis and the different fragments are delayed in transmission by different amounts to afford privacy, a timing means having a timing cycle divided into several periods, a relay individual to each period and individually operated during its respective period by said timing means, a plurality of delay devices to introduce delay into said signals, means controlled by said timing means to select a delay device for each timing period, and means jointly controlled by said relays and selecting means to operate the selected devices.
REFERENCES:
patent: 1605023 (1926-11-01), Hartley
patent: 1676321 (1928-07-01), Carpe
patent: 1981114 (1934-11-01), Mitchell
patent: 2312897 (1943-03-01), Guanella
patent: 2364210 (1944-12-01), Guanella
patent: 3012099 (1961-12-01), Busch et al.
patent: 3012100 (1961-12-01), Mitchell
Bell Telephone Laboratories Incorporated
Bermiel H. A.
Burgess H. A.
Hirsch A. E.
Wilbur Maynard R.
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