Detection system forming wide gates with superior spatial select

Details Detection system forming wide gates with superior spatial select Detection system forming wide gates with superior spatial select

1978-05-10

1981-12-29

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1324

Patent

active

043085300

ABSTRACT:
A detection system comprises at least one gate including transmitter means for forming a magnetic field and receiver means for receiving a signal transmitted by a detecting wafer provided with an oscillating circuit, wherein each gate comprises at least two spatial detection zones.

REFERENCES:
patent: 3631442 (1971-12-01), Fearon
patent: 3665449 (1972-05-01), Elder et al.
patent: 3686564 (1972-08-01), Mallick, Jr. et al.
patent: 3696379 (1972-10-01), Minasy
patent: 3707711 (1972-12-01), Cole et al.
patent: 3765007 (1973-10-01), Eider
patent: 3798642 (1974-03-01), Augenblick et al.
patent: 3868669 (1975-02-01), Minasy
patent: 3895368 (1975-07-01), Gordon et al.
patent: 4135184 (1979-01-01), Pruzick

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