Automatic doorbell driver

Details Automatic doorbell driver Automatic doorbell driver

2006-11-13

2008-09-30

Pham, Toan N (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S692000, C340S384100, C340S565000, C340S392100

Reexamination Certificate

active

07429924

ABSTRACT:
An automatic doorbell driver that utilizes the power, wiring, and primary load of a conventional doorbell system. The automatic doorbell driver comprising coupling means for coupling the automatic doorbell driver to the conventional doorbell system; power supply means for supplying power to the automatic doorbell driver; sensing means for sensing an object in a proximity zone; and switching means responsive to the sensing means for coupling power to, and thereby controlling the energization and de-energization of, the primary load of the conventional doorbell system; whereby the automatic doorbell driver can easily convert the conventional doorbell system into an automatic doorbell system.

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patent: 7023327 (2006-04-01), Chen
patent: 2004/0095254 (2004-05-01), Maruszczak

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