Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1983-12-08
1986-08-19
Brown, Thomas W.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
179 18BA, 340359, H04M 127
Patent
active
046071431
ABSTRACT:
Apparatus for effecting a redially interruption of any optional duration starting from a redialling circuit having an input terminal and an output terminal, the output terminal supplying an interrupt voltage which efficiently interrupts the redialling operation, the current-voltage characteristic of the input terminal being such that current increases continously for voltage values between zero and a predetermined threshold value, and is almost zero for voltages higher than said threshold voltage, a diode connected from the output terminal to the input terminal, and the input terminal is connected to a voltage source for maintaining the voltage at the input terminal at a value higher than the threshold voltage when after the finite duration of the interruption has elapsed the output terminal no longer supplies the interrupt voltage.
REFERENCES:
patent: 4145581 (1979-03-01), Stockdale
patent: 4332985 (1982-06-01), Samuel
patent: 4342882 (1982-08-01), Gravenhorst et al.
patent: 4405833 (1983-09-01), Cave et al.
patent: 4417100 (1983-11-01), Carlson et al.
patent: 4520503 (1985-05-01), Kirst et al.
Prelaz Jean-Claude
Queudot Paul
Briody Thomas A.
Brown Thomas W.
Eason Leroy
Streeter William J.
U.S. Philips Corporation
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