CA2387612A1 - A tamper indicating radio frequency identification label - Google Patents

A tamper indicating radio frequency identification label Download PDF

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Publication number
CA2387612A1
CA2387612A1 CA002387612A CA2387612A CA2387612A1 CA 2387612 A1 CA2387612 A1 CA 2387612A1 CA 002387612 A CA002387612 A CA 002387612A CA 2387612 A CA2387612 A CA 2387612A CA 2387612 A1 CA2387612 A1 CA 2387612A1
Authority
CA
Canada
Prior art keywords
rfid
label
conducting path
substrate
tamper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002387612A
Other languages
French (fr)
Other versions
CA2387612C (en
Inventor
Peter Atherton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mikoh Corp
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2387612A1 publication Critical patent/CA2387612A1/en
Application granted granted Critical
Publication of CA2387612C publication Critical patent/CA2387612C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/4212—Information or decoration elements, e.g. content indicators, or for mailing
    • B65D5/4233—Cards, coupons, labels or the like formed separately from the container or lid
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/073—Special arrangements for circuits, e.g. for protecting identification code in memory
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/073—Special arrangements for circuits, e.g. for protecting identification code in memory
    • G06K19/07309—Means for preventing undesired reading or writing from or onto record carriers
    • G06K19/07372—Means for preventing undesired reading or writing from or onto record carriers by detecting tampering with the circuit
    • G06K19/07381—Means for preventing undesired reading or writing from or onto record carriers by detecting tampering with the circuit with deactivation or otherwise incapacitation of at least a part of the circuit upon detected tampering
    • G06K19/0739—Means for preventing undesired reading or writing from or onto record carriers by detecting tampering with the circuit with deactivation or otherwise incapacitation of at least a part of the circuit upon detected tampering the incapacitated circuit being part of an antenna
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
    • G08B13/2417—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags having a radio frequency identification chip
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2448—Tag with at least dual detection means, e.g. combined inductive and ferromagnetic tags, dual frequencies within a single technology, tampering detection or signalling means on the tag
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2451—Specific applications combined with EAS
    • G08B13/2462—Asset location systems combined with EAS
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2203/00—Decoration means, markings, information elements, contents indicators
    • B65D2203/10—Transponders

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Automation & Control Theory (AREA)
  • Electromagnetism (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Credit Cards Or The Like (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

A tamper indicating label is provided. The label (100) may include RFID components and a tamper track (102) coupled to the RFID components. The tamp er track (102) should be constructed from a destructible conducting path. Additionally, the tamper track (102) can be formed such that it is damaged when the label is tampered. In one embodiment, adhesion characteristics of t he tamper track (102) are adapted to break apart the tamper track when the labe l is tampered, for example, by removal from an object. The RFID components may retain their RF capability and detect when the tamper track (102) has been damaged to indicate that the label has been tampered. Alternatively, the RFI D capability of the RFID components may be disabled when the tamper track (102 ) is damaged, indicating tampering.

Claims (62)

1. A tamper indicating label comprising:
an RFID layer providing an RFID function;
an adhesive layer supporting the RFID layer;
a destructible electrically conducting path sandwiched between the RFID layer and the adhesive layer, whereby the destructible conducting path is disrupted when the label is tampered, thereby modifying the RFID function of the RFID layer.
2. The tamper indicating label of claim 1 wherein the destructible conducting path is an RFID component.
3. The tamper indicating label of any of claims 1 or 2 wherein the destructible conducting path is connected to RFID components in the RFID layer.
4. The tamper indicating label of any of claims 1 or 2 further comprising a pattern of an adhesion modifying coating between the RFID layer and the adhesive layer, the adhesion modifying coating modifying adhesion characteristics of the destructible conducting path.
5. The tamper indicating label of claim 4 wherein the pattern of the adhesion modifying coating includes at least two types of adhesion modifying coating.
6. The tamper indicating label of claim 4 wherein the adhesion modifying coating is printed on a bottom surface of the RFID layer and the destructible conducting path is formed on the adhesion modifying coating.
7. The tamper indicating label of claim 4 further comprising a visual tamper indicator arranged under the RFID layer and wherein the RFID layer is substantially transparent whereby the visual tamper indicator is visible.
8. The tamper indicating label of claim 7 wherein the visual tamper indicator is a colored layer and an adhesion-modifying substance is arranged between the RFID
layer and the adhesive layer, the adhesion-modifying substance causing the colored layer to have different adhesion strengths with respect to the RFID layer and adhesive layer and thereby create a visual pattern on tampering of the label.
9. The tamper indicating label of any of claims 1 or 2 wherein the RFID layer includes a memory chip and one of an antenna and an induction loop.
10. A tamper indicating label comprising:
a substrate having RFID components and a destructible conducting path; and an adhesive layer supporting the substrate, at least a part of the destructible conducting path being in contact with the adhesive layer, whereby the destructible conducting path is modified if the label is at least partially removed from a surface to which it has been applied, thereby modifying RFID characteristics of the RFID
components.
11. The tamper indicating label of claim 10 further comprising:
a second conducting path formed on a top surface of the substrate and wherein the RFID components include an integrated circuit chip on the top surface of the substrate, the integrated circuit chip being connected to the second conducting path; and through-connects linking the second conducting path with the destructible conducting path, which is formed on a bottom surface of the substrate.
12. The tamper indicating label of claim 11 wherein the second conducting path and the destructible conducting path together form one of an antenna and an induction loop.
13. The tamper indicating label of any of claims 10 to 12 or 57 further comprising a top coating formed over the top surface of the substrate.
14. The tamper indicating label of any of claims 10 to 12 or 57 further comprising an adhesion-modifying coating between the substrate and the adhesive layer, the adhesion-modifying coating causing the adhesion strengths of the destructible conducting path to vary.
15. A security label for attachment to an object, comprising:
RFID components providing an RFID function;
means for attaching the RFID components to the object;
a conducting path connected to the RFID components and contacting the means for attaching, the conducting path being interrupted or substantially disrupted when the label is tampered, thereby modifying the RFID characteristics of the RFID
components.
16. The security label of claim 15 further comprising a substrate supporting the RFID
components and wherein the RFID components comprise a computer chip on a bottom surface of the substrate and the conducting path forms one of an antenna and an induction loop on the bottom surface of the substrate.
17. The security label of claim 15 further comprising:
a substrate, the RFID components being formed on a top surface of the substrate; and connection points extending from the RFID components to a bottom surface of the substrate, wherein the conducting path is formed on a bottom surface of the substrate and connects the connection points.
18. The security label of claim 16 or 17 wherein the conducting path must be intact for the RFID components to operate.
19. The security label of claim 17 wherein the conducting path is a circuit functionally separate from the RFID components.
20. The security label of any of claims 17 or 19 wherein the conducting path is a track of conducting material formed in a pattern that extends around substantially the entire circumference of the bottom surface of the substrate.
21. The security label of claim 17 wherein the RFID components include an induction loop or antenna and the conducting path is formed in series with the induction loop or antenna.
22. The security label of claim 17, wherein the conducting path forms an induction loop or antenna.
23. The security label of claim 15 further comprising:
a substrate, the RFID components formed on a top surface of the substrate; and connection points extending from the RFID components to a bottom surface of the substrate, wherein a portion of the conducting path extends from each connection point to form an induction loop or antenna.
24. The security label of claim 23 wherein the conducting path must be intact for the RFID components to operate.
25. A tamper indicating RF identification system, comprising:
a substrate having a top and a bottom surface;
RFID components applied to the bottom surface of the substrate;
a conductive layer applied in a pattern to the bottom surface of the substrate;
an adhesive layer supporting the substrate such that the RFID electronic components and the conductive layer are sandwiched between the substrate and the adhesive layer, and wherein the adhesive layer, the substrate, and conductive layer have relative adhesion strengths such that when the system is partially removed from a surface to which it has been applied, at least one of the RFID components and the conductive layer is altered to modify the RFID characteristics of the system.
26. A security apparatus for indicating tampering, comprising:
an object having a conducting path with at least two end points;
a security label arranged on the object, the label comprising RFID components and a destructible conducting path between the RFID components and individual end points.
27. The apparatus of claim 26 wherein a disruption to the destructible conducting path or the conducting path causes a detectable modification to the RFID
function of said RFID components.
28. The apparatus of claim 26 or 27 wherein RFID components respond in a pre-determined manner when a connection between the RFID components and end points is interrupted or substantially disrupted, or when the electrical pathway through the conducting path and the destructible conducting path is interrupted or substantially modified.
29. The combination of a security label and an object, wherein:
the security label comprises:
RFID components;
means for attaching the RFID components to the object; and destructible electronics connected to the RFID components, the destructible electronics being broken or substantially disrupted when the label is at least partially removed from the object; and the object comprises:
a surface for receiving the security label;
a conducting path having two ends, the ends of the conducting path being coupled to the destructible electronics thereby forming a circuit through the RFID
components, the destructible electronics and the conducting path, whereby RFID
characteristics of the RFID components are modified if the connection between the end points and the RFID components, via the destructible electronics, or through the conducting path, is interrupted or substantially disrupted.
30. A tamper indicating label, comprising:
RFID components;
means for attaching the RFID components to an object; and a tamper track connected to the RFID components, the tamper track being one or more electrically conducting pathways adapted to be damaged when the label is tampered and the RFID components being adapted to detect an interruption in, or substantial disruption to, the tamper track while maintaining their RFID
capability.
31. The label of claim 30 wherein the tamper track is interrupted or substantially disrupted when the means for attaching is interfered with.
32. The label of any of claims 30 or 31 wherein the RFID components are active components.
33. The label of claim 32 wherein the RFID components test the tamper track and record data if the tamper track is interrupted.
34. The label of any of claims 30 and 31 wherein the RFID components are passive.
35. The label of any of claims 30 and 31 wherein the RFID components include only a memory chip.
36. The label of any of claims 30 to 31 wherein the memory chip is permanently altered when the interruption in the tamper track is detected.
37. A tamper indicating label, comprising:
a substrate;
an adhesive layer;
a tamper track arranged between a first side of the substrate and the adhesive layer, portions of the tamper track having different adhering strengths to the substrate and the adhesive layer whereby the tamper track is disrupted when the label is tampered with;
an RFID chip arranged on a second side of the substrate and electrically connected to the tamper track via through connects in the substrate, the RFID
chip being connected to other RFID components to provide an RFID function and detecting any disruption in the tamper track while maintaining the RFID function.
38. The label of claim 37, wherein the RFID chip is electrically connected to the tamper track via contact pads.
39. The label of claim 38, comprising two contact pads connected to the tamper track.
40. The label of any of claims 37 to 39, wherein the RFID chip is permanently altered when the tamper track is disrupted.
41. The label of any of claims 37 to 39, further comprising one of an antenna and an induction loop formed on the second side of the substrate and connected to the RFID
chip.
42. The label of claim 41, wherein one of antenna and the induction loop are connected to the RFID chip via two contact pads.
43. The label of any of claims 37 to 39 wherein when the tamper track is interrupted, or substantially disrupted, the functions or characteristics of the RFID chip are altered in a manner detectable by an RFID reading device so as to indicate the tamper track has been interrupted or substantially disrupted.
44. A tamper indicating label comprising:
a substrate having first and second portions, the second portion being adapted to be looped back and connected to the first portion;
an RFID transponder arranged on the substrate;
a tamper track coupled to the RFID transponder and extending at least partially into the second portion of the substrate;
an adhesive layer arranged on at least a part of the substrate in the second portion that contains the tamper track, the tamper track in that part of the substrate being adapted to be modified due to the relative adhesion strength of the tamper track when the label is tampered.
45. The label of claim 44 wherein the second portion is connected to the first portion by the adhesive layer in an area where either the RFID transponder or the tamper track is arranged.
46. The label of any of claims 44 and 45 wherein the adhesive layer is also arranged on the first portion of the substrate in an area where the second portion is connected.
47. The label of any of claims 44 to 45 further comprising a top or bottom layer formed on regions of the substrate where the adhesive layer is not present.
48. An RFID read/write apparatus, comprising:
means for reading information from an RFID label;
means for interpreting the information to determine if the label is tampered;
and means for writing data to the label indicating the label is tampered if the information indicates the label is tampered.
49. The apparatus of claim 48 wherein the data is written permanently to a chip in the label.
50. A tamper indicating apparatus, comprising:
RFID components providing an RFID function;
a destructible conducting path associated with the RFID components;
an adhesive layer for attaching the RFID components and the destructible conducting path to an object, wherein the RFID components comprise means for detecting and indicating a disruption in the destructible conducting path.
51. The apparatus of claim 50, wherein the RFID components further comprise an electronic memory chip, the electronic chip memory contents being modified when a disruption in the destructible conducting path is detected.
52. The apparatus of claim 51, wherein the RFID components further comprise a clock, the electronic memory chip recording the date and time when the disruption is detected.
53. The apparatus of any of claims 50 to 52, wherein the memory of the electronic memory chip is permanently modified.
54. The apparatus of any of claims 50 to 52, wherein the RFID components are active RFID components.
55. The apparatus of any of claims 50 to 52, wherein the RFID components further comprise an induction loop or antenna.
56. The tamper indicating label of claim 4 wherein the adhesion modifying layer is between the adhesive layer and the destructible conducting path.
57. The tamper indicating label of claim 11 wherein the second conducting path forms one of an antenna and an induction loop, and the destructible conducting path forms a functionally separate electrical circuit.
58. The security label of claim 17 wherein the RFID components include an induction loop or antenna and the conducting path is formed in parallel with said induction loop or antenna.
59. The system of claim 25 further comprising an adhesion modifying layer to adjust the relative adhesions strengths.
60. The label of claim 31 wherein the means for attaching is a layer of pressure sensitive adhesive.
61. The label of claim 42, wherein the contact pads described in claim 42 are different contact pads from those described in claim 38.
62. The label of any of the preceding claims, wherein the destructible conducting path or tamper track is formed using an electrically conducting ink.
CA002387612A 2000-03-21 2001-03-21 A tamper indicating radio frequency identification label Expired - Lifetime CA2387612C (en)

Applications Claiming Priority (14)

Application Number Priority Date Filing Date Title
US19093600P 2000-03-21 2000-03-21
US60/190,936 2000-03-21
US19489000P 2000-04-06 2000-04-06
US60/194,890 2000-04-06
US19741700P 2000-04-14 2000-04-14
US60/197,417 2000-04-14
US24902700P 2000-11-16 2000-11-16
US60/249,027 2000-11-16
US25457500P 2000-12-12 2000-12-12
US60/254,575 2000-12-12
US27090901P 2001-02-26 2001-02-26
US60/270,909 2001-02-26
PCT/US2001/008992 WO2001071848A1 (en) 2000-03-21 2001-03-21 A tamper indicating radio frequency identification label
USUNKNOWN 2003-08-29

Publications (2)

Publication Number Publication Date
CA2387612A1 true CA2387612A1 (en) 2001-09-27
CA2387612C CA2387612C (en) 2010-01-12

Family

ID=27558817

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002387612A Expired - Lifetime CA2387612C (en) 2000-03-21 2001-03-21 A tamper indicating radio frequency identification label

Country Status (3)

Country Link
AU (1) AU2001252935A1 (en)
CA (1) CA2387612C (en)
WO (1) WO2001071848A1 (en)

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