Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1976-09-03
1979-06-19
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular system function
340500, 328 99, 328127, G08B 2500
Patent
active
041588398
ABSTRACT:
A driver circuit designed to respond to one or more of a set of signals by conducting during transitory or other time variations of the signals but by otherwise remaining non conducting. The circuit includes an output driver and provisions for introducing a set of input signals. The output driver is actuated by a first resistance/capacitance network, the first network being responsive to any time variation of one or more of the input signals. The actuation by the first network of the output driver is inhibited by a second resistance/capacitance network after a period of time during which all of the input signals remain time invariant. The circuit further includes a light producing, audible or other alarm device driven by the output driver. The alarm device indicates the presence of a transitory or other time varying input signal. The circuit may also include a capacitor or other filter separating the first network from the second network. This filter prevents the reaction of the first network to time variations of more than one input signal occurring within fixed intervals of one another, the fixed intervals being determined by the filter time constant.
REFERENCES:
patent: 3112475 (1963-11-01), Alessio
patent: 3138759 (1964-06-01), Thompson
patent: 3149243 (1964-09-01), Garfield
patent: 3264626 (1966-08-01), Mounce
patent: 3305732 (1967-02-01), Grossman et al.
patent: 3581300 (1971-05-01), Eloranta
patent: 3636432 (1971-12-01), Stallebrass
patent: 3688294 (1972-08-01), Erpeldins, Jr.
patent: 3696356 (1972-10-01), Franke et al.
Caldwell Sr. John W.
Crosland Donnie L.
Powell Magnetic Industries, Inc.
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