Patent ID: 11869341
Assignee: NICOR, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 10:
11. The electronic door chime of claim 10 further comprising:
a faceplate attached to the front cover and configured to cover the electronic door chime when the housing is installed in the dual voltage box;
the external doorbell device, the external doorbell device comprising a rectifier, a switch, and a light emitting diode configured to light only when the switch is open; and
the second external doorbell device;
wherein the power supply is a transformer producing an AC output that is at least 18 VAC and at least 300 mA;
wherein the AC output is no more than 24 VAC and is no more than 10 VA;
wherein the dual voltage box is a two-gang dual voltage junction box;
wherein the back cover and the front cover are plastic and have a minimum thickness of 2.2 mm;
wherein the doorbell current is an AC current produced by the power supply;
wherein the second doorbell current is another AC current produced by the power supply;
wherein the trigger sensed signal is optically isolated from the doorbell current; and
wherein the second trigger sensed signal is optically isolated from the second doorbell current.