SECURITY COMMUNICATION EQUIPMENT

Brand	Owner (click to sort)	Address	Description
HELP PHONE	NEC HOME ELECTRONICS (USA) INC.	1255 MICHAEL DRIVE WOOD DALE IL 601911094	HOME SECURITY COMMUNICATION EQUIPMENT, NAMELY, TELEPHONE, SMOKE ALARM SENSOR, EMERGENCY CALL ACTIVATOR UNIT, AND APPARATUS TO TRANSMIT TO EMERGENCY SERVICES;PHONE;
REMOTE CALLER	NEC Home Electronics (U.S.A.) Inc.	1401 Estes Ave. Elk Grove Village IL 60007	HOME SECURITY COMMUNICATION EQUIPMENT, NAMELY HAND-HELD TRANSMITTERS;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A system is disclosed including a transmitter and receiver for the communication of security codes which may be validated at the receiver to operate equipment. In one embodiment, the transmitter transmits a security code at two frequencies contemporaneously to the receiver which may receive both frequencies and resolve the security code therefrom. The receiver may lock onto one frequency when parts of a security code are detected to the exclusion of the other frequency. In another embodiment, the transmitter selectively transmits security codes at a default frequency which is selected because of a recorded count of prior apparent successful transmission.