Anti-theft method for detecting the unauthorized opening of containers and baggage

• US 5,831,531 A
• Filed: 03/25/1997
• Issued: 11/03/1998
• Est. Priority Date: 07/27/1992
• Status: Expired

• Current Assignee: Round Rock Research LLC
• Original Assignee: Micron Communications, Inc. (Micron Technology, Inc.)
• Inventors: Tuttle, John R.
• Primary Examiner(s): SWANN III, GLEN R
• Application Number:
  US08/827,037
• Time in Patent Office: 588 Days
• Field of Search: 340/540, 340/541, 340/542, 340/547, 340/572, 340/652
• US Class Current: 340/568.2
• CPC Class Codes: G08B 13/126 for a housing, e.g. a box, a safe, or a room
• CPC Class Codes: G08B 13/1427 with transmitter-receiver for distance detection
• CPC Class Codes: G08B 13/1445 with detection of interference with a cable tethering an article, e.g. alarm activated by detecting detachment of article, breaking or stretching of cable furniture, e.g. shelves for displaying merchandise, incorporating tethers to prevent theft A47F7/024, A47F5/0861
• CPC Class Codes: G08B 21/0286 Tampering or removal detection of the child unit from child or article

Abstract

A simple trip-wire or magnetic circuit associated with a shipping container provides continuity, which is detected electrically. Simply, if continuity is disabled by a forced entry of the container, electrical detection means, such as a radio-frequency-identification (RFID) tag, will alert the owner or monitoring station. The trip-wire concept would require the replacing of a broken trip wire (resulting from forced entry), while the magnetic circuit concept can be reused repetitively. In a second embodiment a magnetic circuit and the detection device (RFID tag) are embedded into the shipping article during manufacturing. The preferred detection device, an RFID tag, could also be a battery backed transceiver type on which a replaceable or rechargeable battery could be mounted on the inside of the shipping container during manufacturing. The RFID tag would communicate with an interrogator unit, which could be connected to a host computer. The interrogator and/or the host computer and/or other alarm devices would then monitor the shipping container'"'"'s status (opened or closed).

Claims

1. For an apparatus having an aperture capable of being closed and opened by moving first and second closure members together and apart, respectively, an improved security device for signalling whether the aperture is opened, comprising:

(a) an elongated electrical conductor having first and second ends, the conductor extending between the two closure members and being attached to both the first closure member and the second closure member so that the two closure members cannot be moved apart more than a predetermined amount to open the aperture without breaking the conductor; and

(b) an RFID transceiver, connected to the two ends of the conductor, including an electrical circuit for detecting when electrical continuity between the two ends of the conductor is broken and subsequently transmitting a radio frequency alarm signal.

2. A security device according to claim 1, wherein said apparatus is a container and the first and second closure members are external walls of the container.

3. A security device according to claim 2, wherein the RFID transceiver is embedded within a wall of the container.

4. A security device according to claim 1, wherein said apparatus is a suitcase and the first and second closure members are external walls of the suitcase.

5. For an apparatus having an aperture capable of being closed and opened by moving first and second closure members together and apart, respectively, an improved security device for signalling whether the aperture is opened, comprising:

(a) an electrical device, mounted on the apparatus adjacent the aperture, for detecting whether the aperture is open or closed; and

(b) an RFID transceiver which transmits a radio frequency alarm signal after said device detects the aperture has been opened.

6. A security device according to claim 5, wherein the electrical device includes a magnet.

7. A security device according to claim 5, wherein the electrical device includes an elongated electrical conductor having first and second ends, the conductor extending between the two closure members and being attached to both the first closure member and the second closure member so that the two closure members cannot be moved apart a substantial amount to open the aperture without breaking the conductor.

8. A security device according to claim 5, wherein said apparatus is a container and the first and second closure members are external walls of the container.

9. A security device according to claim 8, wherein the RFID transceiver is embedded within a wall of the container.

10. A security device according to claim 5, wherein said apparatus is a suitcase and the first and second closure members are external walls of the suitcase.

11. For an apparatus having an aperture which is selectably closed and opened by moving first and second closure members together and apart, respectively, an improved security device for signalling whether the aperture is opened, comprising:

(a) an electrical device, mounted on the apparatus adjacent the aperture, for detecting whether the aperture is open or closed, wherein the electrical device includes;

(i) first and second electrical contacts mounted on the first closure member, and

(ii) a third electrical contact mounted on the second closure member at a position such that, when the two closure members are moved together so as to close the aperture, the third electrical contact mates with both the first and the second contacts so as to complete an electrical continuity between the first and second contacts; and

(b) an RFID transceiver which transmits a radio frequency alarm signal in response to said electrical continuity being broken.

12. A secure apparatus for signalling whether an aperture of the apparatus is opened, comprising:

an apparatus having first and second closure members and having an aperture capable of being closed and opened by moving the two closure members together and apart, respectively;

an electrical device, mounted on the apparatus adjacent the aperture, for detecting whether the aperture is opened; and

an RFID transceiver which transmits an alarm signal after said device detects the aperture has been opened.

13. Apparatus according to claim 12, wherein the electrical device includes an elongated electrical conductor having first and second ends, the conductor extending between the two closure members and being attached to both the first closure member and the second closure member so that the two closure members cannot be moved apart more than a predetermined amount to open the aperture without breaking the conductor.

14. Apparatus according to claim 13, further comprising:

a hinge mounted on a first end of each closure member;

wherein the conductor extends between the two closure members at a second end of each closure member opposite the hinge.

15. Apparatus according to claim 14, further comprising:

a handle mounted on the second end of one of the closure members; and

a strap encircling the handle;

wherein the RFID transceiver is mounted on the strap.

16. Apparatus according to claim 12, wherein:

the electrical device includes

first and second electrical contacts mounted on the first closure member, and

a third electrical contact mounted on the second closure member at a position such that, when the two closure members are moved together so as to close the aperture, the third contact mates with both the first and second contacts so as to complete an electrical continuity between the first and second contacts; and

the RFID transceiver transmits said radio frequency alarm signal in response to said electrical continuity being broken.

17. Apparatus according to claim 16, wherein the first, second and third electrical contacts respectively comprise first, second and third magnetic contacts.

18. Apparatus according to claim 12, wherein the electrical device includes a magnetic device.

19. Apparatus according to claim 12, wherein said apparatus is a container and the first and second closure members are external walls of the container.

20. Apparatus according to claim 19, wherein the RFID transceiver is embedded within a wall of the container.

21. Apparatus according to claim 12, wherein:

said apparatus is a suitcase; and

the first and second closure members are external walls of the suitcase.

22. Apparatus according to claim 12, wherein:

said apparatus is a doorway;

the first closure member is a door frame; and

the second closure member is a door.

23. A method for signalling whether an aperture is opened, comprising the steps of:

providing an apparatus having first and second closure members and having an aperture capable of being closed and opened by moving the first and second closure members together and apart, respectively;

detecting whether the aperture is opened; and

in response to detecting that the aperture is opened, transmitting a radio frequency alarm signal.

24. A method according to claim 23, wherein the detecting step comprises:

mounting adjacent the aperture an electrical detecting device having an electrical condition responsive to whether the aperture is opened; and

detecting whether the aperture is opened by detecting the electrical condition of the detecting device.

25. A method according to claim 24, wherein:

the step of mounting an electrical detecting device comprises extending between the two closure members an elongated electrical conductor having first and second ends, and attaching the conductor to both the first closure member and the second closure member so that the two closure members cannot be moved apart more than a predetermined amount to open the aperture without breaking the conductor; and

the step of detecting whether the aperture is opened comprises detecting whether electrical continuity between the two ends of the conductor is broken.

26. A method according to claim 24, wherein the step of mounting an electrical detecting device comprises mounting a magnet adjacent the aperture.

27. A method according to claim 23, wherein the providing step comprises:

providing a container having first and second external walls, wherein said apparatus is the container and said first and second closure members are the first and second external walls of the container, respectively.

28. A method according to claim 27, further comprising the step of:

embedding an RFID transceiver within a wall of the container;

wherein the transmitting step comprises the RFID transceiver transmitting the radio frequency alarm signal.

29. A method according to claim 28, further comprising the steps of:

mounting a replaceable battery within the container so as to be accessible only from the interior of the container; and

connecting the battery to the RFID transceiver.

30. A method according to claim 27, wherein the step of providing a container comprises:

providing a suitcase as said container.

31. A method according to claim 23, wherein the transmitting step further comprises:

receiving radio frequency interrogation signals; and

transmitting said radio frequency alarm signal only after receiving a radio frequency interrogation signal subsequent to said detecting that the aperture is opened.