Patent ID: 9539450
Date: 2017-01-10
CPC Classifications: A62C

Claim:
1. A fire extinguishing system for an appliance to detect an emergency condition, the fire extinguishing system comprising: at least one sensor for detecting a condition regarding the appliance; an alarm circuit coupled to the at least one sensor; a radio frequency (RF) transmitter circuit coupled to the alarm circuit through a common-mode choke, the RF transmitter circuit configured to transmit an RF signal at a specified frequency when powered up by a transistor coupled to the common-mode choke, wherein a code transmitted at the frequency is programmed into a microprocessor within the RF transmitter circuit; and a shut-off assembly configured to shut-off the appliance, wherein the shut-off assembly includes an RF receiver circuit configured to receive the RF signal having the code at the specified frequency to initiate a shut-off sequence.