Security and communication system
First Claim
1. A security and communication system, which comprises:
- at least one portable radio frequency transmitter having means for sending a first signal including a first individual identification code to identify the portable transmitter, when actuated by the user;
a plurality of radio frequency relays, each positioned in a predetermined location and having means for receiving said first signal and immediately transmitting a second signal including said first identification code and a second identification code to identify the individual relay that is transmitting the second signal;
each of said relays having alarm means for actuation in response to receipt of said second signal from another relay;
each of said relays also having means for inhibiting its alarm in response to receipt of said first signal, whereby the relay directly receiving said first signal has its alarm inhibited while the alarm means of the other relays are not inhibited.
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Accused Products
Abstract
A security and communication system permits the location of signaling portable radio frequency transmitters which may be carried by individuals. If an individual signals with his portable frequency transmitter, a first signal is sent including a first individual identification code to identify the particular portable transmitter. The first signal is picked up by at least one of a plurality of radio frequency relays each positioned in a predetermined location. Such relays immediately transmit a second signal including the first identification code and also a second identification code to identify the individual relay that is transmitting the second signal. Thus the signal sent by the individual relay identifies the location and the specific identity of the particular portable radio frequency transmitter which is sending the signal.
171 Citations
19 Claims
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1. A security and communication system, which comprises:
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at least one portable radio frequency transmitter having means for sending a first signal including a first individual identification code to identify the portable transmitter, when actuated by the user; a plurality of radio frequency relays, each positioned in a predetermined location and having means for receiving said first signal and immediately transmitting a second signal including said first identification code and a second identification code to identify the individual relay that is transmitting the second signal; each of said relays having alarm means for actuation in response to receipt of said second signal from another relay;
each of said relays also having means for inhibiting its alarm in response to receipt of said first signal, whereby the relay directly receiving said first signal has its alarm inhibited while the alarm means of the other relays are not inhibited. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A security and communication system which comprises:
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a plurality of radio frequency transmitters, each of a size small enough to be carryable by individual users, and having means for sending a first signal including a first individual identification code to identify the portable transmitter, when actuated by the user; a plurality of radio frequency relays, each positioned in a predetermined location and having means for receiving said first signal and immediately transmitting a second signal including said first identification code and a second identification code to identify the individual relay that is transmitting the second signal; said radio frequency relays being spread out in their positions so that no more than relatively few of said plurality of relays can be simultaneously actuated by receiving said first signal from the same portable transmitter, whereby the general location of the signaling portable transmitter can be established; each of said relays having alarm means for actuation in response to receipt of said second signal from another relay;
each of said relays also having means for inhibiting its alarm in response to receipt of said first signal, whereby the relay directly receiving said first signal has its alarm inhibited while the alarm means of the other relays are not inhibited; andcentral means for receiving the signals form said radio frequency relays. - View Dependent Claims (9, 10, 11, 12)
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13. A security and communication system, which comprises:
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at least one portable radio frequency transmitter having means for sending a first signal including a first individual identification code to identify the portable transmitter, when actuated by the user; a plurality of radio frequency relays, each positioned in a predetermined location and having means for receiving said first signal and immediately transmitting a second signal including said first identification code and a second identification code to identify the individual relay that is transmitting the second signal, said radio frequency relays being spread out in their positions so that only no more than relatively few of said plurality of relays can be simultaneously actuated by receiving said first signal from the same portable transmitter, whereby the general location of the signaling portable transmitter can be established; each of said relays having alarm means for actuation in response to receipt of said second signal from another relay;
each of said relays also having means for inhibiting its alarm in response to receipt of said first signal, whereby the relay directly receiving said first signal has its alarm inhibited while the alarm means of the other relays are not inhibited; - View Dependent Claims (14, 15)
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16. In a security and communciation syste, a plurality of radio frequendy relays, each positioned in a predetermined location and having means for receiving a first signal and immediately transmitting a second signal plus an identification code to identify the individual relay that is transmitting the second signal, said radio frequency relays being spread out in their positions so that only no more than relatively few of said plurality of relays can be simultaneously actuated by receiving a first signal from a portable transmitter, whereby the general location of the signaling portable transmitter can be established;
- each of said relays having alarm means for actuation in response to receipt of said second signal from another relay;
each of said relay also having means for inhibiting its alarm in response to receipt of said first signal, whereby the relay directly receiving said first signal has its alarm inhibited while the alarm means of the other relays are not inhibited. - View Dependent Claims (17, 18, 19)
- each of said relays having alarm means for actuation in response to receipt of said second signal from another relay;
Specification