WO2009050337A1 - Method for rfid tagging - Google Patents

Method for rfid tagging Download PDF

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Publication number
WO2009050337A1
WO2009050337A1 PCT/FI2008/050575 FI2008050575W WO2009050337A1 WO 2009050337 A1 WO2009050337 A1 WO 2009050337A1 FI 2008050575 W FI2008050575 W FI 2008050575W WO 2009050337 A1 WO2009050337 A1 WO 2009050337A1
Authority
WO
WIPO (PCT)
Prior art keywords
tag
item
substrate
antenna
rfid tag
Prior art date
Application number
PCT/FI2008/050575
Other languages
French (fr)
Inventor
Heikki Ahokas
Matti Ritamäki
Marko Hanhikorpi
Original Assignee
Confidex Oy
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 Confidex Oy filed Critical Confidex Oy
Priority to US12/682,446 priority Critical patent/US20100213264A1/en
Priority to EP08839784A priority patent/EP2201502A4/en
Publication of WO2009050337A1 publication Critical patent/WO2009050337A1/en

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Classifications

    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49016—Antenna or wave energy "plumbing" making

Definitions

  • the present invention relates to an RFID tag to be attached to an item, the tag comprising an antenna and an integrated circuit, the RFID tag further comprising a substrate on which the antenna is attached.
  • the present invention further relates to a method for marking an item.
  • RFID Radio Frequency Identification
  • tagging of items made of materials which can be either wet or dry during their lifetime is very problematic. This is because dielectric properties are very different in dry and wet materials.
  • the RF (Radio Frequency) design and tuning of the tag have to be very different compared to dry conditions. In practice, this means that in order to enable RFID tag functionality, two tags have to be used: one designed for wet conditions, another for dry conditions. As an example, a wooden pallet application can be presented. Solving the RFID tagging problem in wooden pallets has been a great challenge for a long time. Both the mechanical durability of the tag and the fact that wood is RF-wise very different in its wet and dry stages have caused serious implementation problems.
  • stand-off means spacing the antenna of the tag off of the surface of the item.
  • the RFID tag is located either one of the center/corner blocks or one of the top/side boards.
  • the tag when the tag is attached to the outer surface of the wooden pallet, it never survives a long time, since forklifts push and handle pallets in such a way that will break the tag.
  • the tag cover is made of steel or plastic, or if the tag is thin and flexibly laminated, it is always broken when a forklift with a huge mass hits the tag.
  • An object of the present invention is thus to provide an RFID tag and a method for marking items so as to alleviate the above disadvantage.
  • the identification tag of the invention is characterized in that the substrate is construed to form a stand-off relation between the item and the antenna when buried inside of the material of the item.
  • the method of the invention is characterized by making a space in the item for positioning an RFID tag to said item, said RFID tag comprising an antenna and an integrated circuit, the RFID tag further comprising a substrate, inserting the RFID tag in said space in the item, and attaching the RFID tag in said space in the item so that the antenna does not touch the surface of the item.
  • the invention is based on the realization that the RFID tag may be buried inside the item, such as a wood block, but in such a way that it does not touch the surface of the item.
  • An advantage is that the RFID tag is always under the same dielectric constant load conditions, and its RF performance remains the same all the time.
  • Figure 1 is a schematic view of a step of an embodiment of the method according to the invention.
  • Figure 2 is a schematic side view of further steps of the method shown in Figure 1 ;
  • Figure 3 is a schematic side view of steps of a third embodiment of the method according to the invention.
  • Figure 4a is a schematic side view of an identification tag of the in- vention;
  • Figure 4b is a schematic side view of the tag shown in Figure 4a cut along line A-A;
  • Figure 5 is a schematic view of a fourth embodiment of the method according to the invention.
  • FIG. 1 is a schematic view of a step of an embodiment of the method according to the invention.
  • An item to be tagged is a wooden pallet 1.
  • a hole 2 (the depth of the hole at least equal to the length of the tag) is made in a corner block 3 of the pallet 1 with a drilling machine 4.
  • the bottom side of the corner block 3 is preferred, because it prevents dust from entering the hole 2.
  • the hole 2 is drilled close to the outer sides of the corner block 3 to obtain an optimal reading range for the tag.
  • the RFID tag is buried inside the material, into a drilled hole (or, for example, a groove), and the shape of the tag is such that it does not touch the surface of the material. In this way it is ensured that the tag does not touch the surface of the material and that the surrounding dielectric constant remains the same, irrespective of the material being wet or dry.
  • FIG 2 is a schematic side view of another steps of the method shown in Figure 1.
  • the tag 5 is just slid into the hole 2.
  • the tag 5 has a sawtooth shape on its longer edges and, thus, it sticks inside the hole 2.
  • the wood is also usually dry there.
  • the tag 5 is always under the same dielectric constant load conditions, and its RF performance remains the same all the time.
  • FIG 3 is a schematic side view of steps of a third embodiment of the method according to the invention.
  • An insertion tool 6 may be used for slid- ing the tag 5 into a drilled hole 2.
  • the insertion tool 6 may have a longitudinally arranged slit where the tag 5 is kept by an interference fit.
  • Figure 4a is a schematic side view of an identification tag of the invention.
  • the dimensions shown in Figures 4 are just examples of dimensions of an embodiment of a tag according to the invention.
  • the RFID tag 5 may be used for identification of, for instance, wooden pallets.
  • Figure 4b is a schematic side view of the tag shown in Figure 4a cut along line A-A.
  • An antenna layer 13 is arranged between two layers 14 of plastics. The plastics layers are attached to the antenna layer 13 by adhesive layers.
  • the plastic material may be, for instance, PET (Polyethyleneterephthalate) or PP (Polypropylene).
  • the RFID tag comprises an antenna 7 and an integrated circuit 8 on a chip on a surface of a substrate 9.
  • the RFID tag is relatively rigid due to the plastic layers so that when bending it its structure does not collapse but resists tension exerted on it.
  • the substrate 9 may have, preferably, an elongated form. The long sides of the substrate 9 are serrated. The shape of the teeth 10 of the serrated structure may vary. Further, the teeth 10 of the serrated structure may be inclined so that the tag 5 is easier to push into a mounting hole. It is to be noted that the serration is not an essential feature of the tag but just an optional one.
  • the substrate 9 has two width dimensions. The first width dimension is the width without the serrated structure, and the second dimension is the width with the serrated structure.
  • the first width dimension is smaller than the second width dimension by two times the height of the tooth 10.
  • the diameter of the hole or the groove into which the tag 5 is to be inserted is usually chosen so that it is larger than the first dimension of the substrate 9 but smaller than the second dimension of the substrate 9.
  • the antenna 7 may be a coil or an antenna based on the dipole- antenna technique.
  • the antenna may be manufactured, for example, by printing, etching, die-cutting, vaporizing, sputtering or by some other additive tech- nique on the surface of the substrate.
  • the antenna 7 comprises an electrically conductive material, such as copper, aluminum, or silver.
  • the substrate 9 is typically a plastic material, such as polyester or PET. It may also be manufactured from some other material, such as cellophane or paper.
  • the substrate 9 may be covered with at least one material layer on at least one side of the substrate 9.
  • the possible material layers are attached to the substrate 9 and each other preferably by laminating.
  • the manufacturing method is preferably continuous, i.e. it uses materials in a web form.
  • the chip can be a silicon chip or a polymer chip. There are several possibilities to attach the chip to the antenna 7, for example by using solder paste, isotropically conductive adhesive, or anisotropically conductive adhe- sive.
  • the adhesive can be a film or a fluid adhesive which will be dried and/or cured. The aim is that an electrical connection is formed between the antenna 7 and the chip.
  • the antenna 7 may be adapted to work at UHF (Ultra-High Fre- quency) frequencies, preferably at a frequency between 840 MHz and 960 MHz. Another preferable frequency range lays around 13.56 MHz and 2.4 GHz.
  • UHF Ultra-High Fre- quency
  • FIG. 5 is a schematic view of a fourth embodiment of the method according to the invention.
  • a log 12 of wood has been tagged.
  • a groove 11 is made on the surface of the log 12. Due to the shape and rigidity of the substrate 9, a stand-off to the tag is created. Therefore, the tag 5 works in the same way, irrespective of the moisture content of the wood.
  • the shape, the material combination and the thickness of the tag can vary, as long as the tag is sufficiently rigid and, preferably, includes some tooth shape in the edges to lock the tag in a hole 2 or groove 11 without touching the surface of the intermediate material of the item that would change the RF tuning of the tag.
  • the tag of the invention has a flat structure, or a sheet-like structure, i.e. it can be manufactured by laminating. This kind of tag can be manufactured by low-cost methods as a thin laminated version without stand-off or encapsulation material.
  • the tag may also have other shapes.
  • the tag may be a cylinder which fits in a hole. Further, the surface of the cylinder may be threaded.

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Details Of Aerials (AREA)

Abstract

An RFID tag to be attached to an item, and a method. The tag (5) comprises an antenna (7) and an integrated circuit (8). The RFID tag (5) further comprises a substrate (9) on which the antenna (7) is attached. The substrate (9) is construed to form a stand-off relation between the item and the antenna (7) when buried inside of the material of the item.

Description

METHOD FOR RFID TAGGING
FIELD OF THE INVENTION
The present invention relates to an RFID tag to be attached to an item, the tag comprising an antenna and an integrated circuit, the RFID tag further comprising a substrate on which the antenna is attached.
The present invention further relates to a method for marking an item.
BACKGROUND OF THE INVENTION
RFID (Radio Frequency Identification) tagging of items made of materials which can be either wet or dry during their lifetime (for example, on concrete walls/floors, logs, wooden pallets, etc.) is very problematic. This is because dielectric properties are very different in dry and wet materials. For wet conditions, the RF (Radio Frequency) design and tuning of the tag have to be very different compared to dry conditions. In practice, this means that in order to enable RFID tag functionality, two tags have to be used: one designed for wet conditions, another for dry conditions. As an example, a wooden pallet application can be presented. Solving the RFID tagging problem in wooden pallets has been a great challenge for a long time. Both the mechanical durability of the tag and the fact that wood is RF-wise very different in its wet and dry stages have caused serious implementation problems.
Mechanical durability issues in the case of a wooden pallet are related to the survivability of the tag when wooden pallet is handled. Since wood has very different RF and dielectric properties (dielectric constant, loss factor) when it is dry and wet, the attachment of the RFID tag to the surface of the wood pallet with some stand-off from wood has been preferred. The term
"stand-off means spacing the antenna of the tag off of the surface of the item.
Normally, the RFID tag is located either one of the center/corner blocks or one of the top/side boards. However, when the tag is attached to the outer surface of the wooden pallet, it never survives a long time, since forklifts push and handle pallets in such a way that will break the tag. Even if the tag cover is made of steel or plastic, or if the tag is thin and flexibly laminated, it is always broken when a forklift with a huge mass hits the tag.
When a very thin tag structure has been used and the attachment has been selected so that the tag is on the surface of wood without any stand- off, this has created RF functionality problems since, as mentioned above, the RF performance of the tag is dramatically affected by the fact whether the wood is dry or wet. The tag can only be optimized for either wet or dry wood conditions but not for both at the same time.
Not only wooden pallets but also tagging or marking of log of woods, food casings and other consumer packing as well as in woodworks and ornamental structures made of wood, for instance, have been problematic with known RFID tags.
BRIEF DESCRIPTION OF THE INVENTION
An object of the present invention is thus to provide an RFID tag and a method for marking items so as to alleviate the above disadvantage.
The identification tag of the invention is characterized in that the substrate is construed to form a stand-off relation between the item and the antenna when buried inside of the material of the item.
The method of the invention is characterized by making a space in the item for positioning an RFID tag to said item, said RFID tag comprising an antenna and an integrated circuit, the RFID tag further comprising a substrate, inserting the RFID tag in said space in the item, and attaching the RFID tag in said space in the item so that the antenna does not touch the surface of the item. The invention is based on the realization that the RFID tag may be buried inside the item, such as a wood block, but in such a way that it does not touch the surface of the item. An advantage is that the RFID tag is always under the same dielectric constant load conditions, and its RF performance remains the same all the time. BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention will be described in greater detail by means of preferred embodiments with reference to the attached [accompanying] drawings, in which
Figure 1 is a schematic view of a step of an embodiment of the method according to the invention;
Figure 2 is a schematic side view of further steps of the method shown in Figure 1 ;
Figure 3 is a schematic side view of steps of a third embodiment of the method according to the invention; Figure 4a is a schematic side view of an identification tag of the in- vention;
Figure 4b is a schematic side view of the tag shown in Figure 4a cut along line A-A; and
Figure 5 is a schematic view of a fourth embodiment of the method according to the invention.
For the sake of clarity, the figures show the invention in a simplified manner. Like reference numerals identify like elements.
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 is a schematic view of a step of an embodiment of the method according to the invention. An item to be tagged is a wooden pallet 1. A hole 2 (the depth of the hole at least equal to the length of the tag) is made in a corner block 3 of the pallet 1 with a drilling machine 4. The bottom side of the corner block 3 is preferred, because it prevents dust from entering the hole 2. The hole 2 is drilled close to the outer sides of the corner block 3 to obtain an optimal reading range for the tag.
In the method according to the invention, the RFID tag is buried inside the material, into a drilled hole (or, for example, a groove), and the shape of the tag is such that it does not touch the surface of the material. In this way it is ensured that the tag does not touch the surface of the material and that the surrounding dielectric constant remains the same, irrespective of the material being wet or dry.
Figure 2 is a schematic side view of another steps of the method shown in Figure 1. The tag 5 is just slid into the hole 2. The tag 5 has a sawtooth shape on its longer edges and, thus, it sticks inside the hole 2. When the tag 5 is inside the item, the wood is also usually dry there.
Therefore, the tag 5 is always under the same dielectric constant load conditions, and its RF performance remains the same all the time.
Figure 3 is a schematic side view of steps of a third embodiment of the method according to the invention. An insertion tool 6 may be used for slid- ing the tag 5 into a drilled hole 2. The insertion tool 6 may have a longitudinally arranged slit where the tag 5 is kept by an interference fit.
Figure 4a is a schematic side view of an identification tag of the invention. The dimensions shown in Figures 4 are just examples of dimensions of an embodiment of a tag according to the invention. The RFID tag 5 may be used for identification of, for instance, wooden pallets. Figure 4b is a schematic side view of the tag shown in Figure 4a cut along line A-A. An antenna layer 13 is arranged between two layers 14 of plastics. The plastics layers are attached to the antenna layer 13 by adhesive layers. The plastic material may be, for instance, PET (Polyethyleneterephthalate) or PP (Polypropylene).
The RFID tag comprises an antenna 7 and an integrated circuit 8 on a chip on a surface of a substrate 9. The RFID tag is relatively rigid due to the plastic layers so that when bending it its structure does not collapse but resists tension exerted on it. The substrate 9 may have, preferably, an elongated form. The long sides of the substrate 9 are serrated. The shape of the teeth 10 of the serrated structure may vary. Further, the teeth 10 of the serrated structure may be inclined so that the tag 5 is easier to push into a mounting hole. It is to be noted that the serration is not an essential feature of the tag but just an optional one. The substrate 9 has two width dimensions. The first width dimension is the width without the serrated structure, and the second dimension is the width with the serrated structure. In other words, the first width dimension is smaller than the second width dimension by two times the height of the tooth 10. The diameter of the hole or the groove into which the tag 5 is to be inserted is usually chosen so that it is larger than the first dimension of the substrate 9 but smaller than the second dimension of the substrate 9.
The antenna 7 may be a coil or an antenna based on the dipole- antenna technique. The antenna may be manufactured, for example, by printing, etching, die-cutting, vaporizing, sputtering or by some other additive tech- nique on the surface of the substrate. The antenna 7 comprises an electrically conductive material, such as copper, aluminum, or silver.
The substrate 9 is typically a plastic material, such as polyester or PET. It may also be manufactured from some other material, such as cellophane or paper. The substrate 9 may be covered with at least one material layer on at least one side of the substrate 9. The possible material layers are attached to the substrate 9 and each other preferably by laminating. The manufacturing method is preferably continuous, i.e. it uses materials in a web form.
The chip can be a silicon chip or a polymer chip. There are several possibilities to attach the chip to the antenna 7, for example by using solder paste, isotropically conductive adhesive, or anisotropically conductive adhe- sive. The adhesive can be a film or a fluid adhesive which will be dried and/or cured. The aim is that an electrical connection is formed between the antenna 7 and the chip.
The antenna 7 may be adapted to work at UHF (Ultra-High Fre- quency) frequencies, preferably at a frequency between 840 MHz and 960 MHz. Another preferable frequency range lays around 13.56 MHz and 2.4 GHz.
Figure 5 is a schematic view of a fourth embodiment of the method according to the invention. In this case a log 12 of wood has been tagged. In- stead of drilling a hole, a groove 11 is made on the surface of the log 12. Due to the shape and rigidity of the substrate 9, a stand-off to the tag is created. Therefore, the tag 5 works in the same way, irrespective of the moisture content of the wood.
The shape, the material combination and the thickness of the tag can vary, as long as the tag is sufficiently rigid and, preferably, includes some tooth shape in the edges to lock the tag in a hole 2 or groove 11 without touching the surface of the intermediate material of the item that would change the RF tuning of the tag.
It is preferred that the tag of the invention has a flat structure, or a sheet-like structure, i.e. it can be manufactured by laminating. This kind of tag can be manufactured by low-cost methods as a thin laminated version without stand-off or encapsulation material.
Naturally, the tag may also have other shapes. For example, the tag may be a cylinder which fits in a hole. Further, the surface of the cylinder may be threaded.
A skilled person knows the antennas and the antenna substrates well, so more detailed description is not needed here.
It will be obvious to a person skilled in the art that, as the technology advances, the inventive concept can be implemented in various ways. The in- vention and its embodiments are not limited to the examples described above but may vary within the scope of the claims.

Claims

1. An RFID tag to be attached to an item, the tag (5) comprising an antenna (7) and an integrated circuit (8), the RFID tag (5) further comprising a substrate (9) on which the antenna (7) is attached, ch aracte rized in that the substrate (9) is construed to form a stand-off relation between the item and the antenna (7) when buried inside of the material of the item.
2. The tag according to claim 1, ch aracterized in that the tag is relatively rigid and has an elongated form, and that the long sides of the substrate are serrated.
3. The tag according to claim 1 or 2, ch a racte rized in that the tag (5) has a flat structure.
4. The tag according to claim 1 or 2, c h a racte r ized in that the tag (5) has a cylinder structure.
5. The tag according to claim 4, ch aracterized in that the surface of the cylinder is threaded.
6. The tag according to any one of claims 1 to 5, ch aracte rize d in that the substrate (9) is made of polyester or PET.
7. A method for marking an item, the method comprising: making a space in the item for positioning an RFID tag (5) to said item, said RFID tag (5) comprising an antenna (7) and an integrated circuit, the RFID tag (5) further comprising a substrate (9), inserting the RFID tag (5) in said space in the item, and attaching the RFID tag (5) in said space in the item so that the antenna (7) does not touch the surface of the item.
8. The method according to claim 7, ch a racte rized in that the space is a hole (2) or a groove (11 ).
9. The method according to claim 7 or 8, ch aracterized in that the substrate (9) is relatively rigid and has an elongated form, and that the long sides of the substrate (9) comprises a serrated structure, wherein the tag (5) is attached in the hole (2) or a groove (11) the diameter of which is larger than the width of the substrate (9) without the serrated structures but smaller than the substrate (9) with said serrated structures.
10. The method according to any one of claims 7 to 9, c h a racte r i z e d by making the space in wood.
PCT/FI2008/050575 2007-10-16 2008-10-15 Method for rfid tagging WO2009050337A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US12/682,446 US20100213264A1 (en) 2007-10-16 2008-10-15 Method for rfid tagging
EP08839784A EP2201502A4 (en) 2007-10-16 2008-10-15 Method for rfid tagging

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US96083807P 2007-10-16 2007-10-16
US60/960,838 2007-10-16

Publications (1)

Publication Number Publication Date
WO2009050337A1 true WO2009050337A1 (en) 2009-04-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2008/050575 WO2009050337A1 (en) 2007-10-16 2008-10-15 Method for rfid tagging

Country Status (3)

Country Link
US (1) US20100213264A1 (en)
EP (1) EP2201502A4 (en)
WO (1) WO2009050337A1 (en)

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US20100098507A1 (en) * 2008-10-16 2010-04-22 Merrick Systems Inc. Hole drilling apparatus and process for edge mounted rfid tag
WO2011038743A1 (en) 2009-09-29 2011-04-07 Tallinn University Of Technology Transponder and method for its application
US8511570B2 (en) 2008-12-22 2013-08-20 Teknologian Tutkimuskeskus Vtt Transponder, transponder kit, method of applying the transponder and product comprising the transponder
US8836585B2 (en) 2008-12-22 2014-09-16 Teknologian Tutkimuskeskus Vtt Radio-frequency transponder for marking wood products and method of manufacturing thereof
EP2812155A4 (en) * 2012-02-08 2015-11-18 Stanley Black & Decker Inc Hand tool having an electronic identification device

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SI24414A (en) * 2013-06-21 2014-12-31 Simon Stegel Identification device for wood, which can be traced by rfid
AU2016267547B2 (en) 2015-05-25 2021-03-11 Wewewe Gmbh Insertion body, assembly of insertion bodies and method for inserting an insertion body
US11157789B2 (en) 2019-02-18 2021-10-26 Compx International Inc. Medicinal dosage storage and method for combined electronic inventory data and access control

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FR2810436A1 (en) * 2000-06-19 2001-12-21 Bernard Abel Andre Leuvrey Labelling system for wood during processing includes electronic radio label inserted in carrier attached to wood surface
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100098507A1 (en) * 2008-10-16 2010-04-22 Merrick Systems Inc. Hole drilling apparatus and process for edge mounted rfid tag
US9089902B2 (en) * 2008-10-16 2015-07-28 Vallourec Oil And Gas France, S.A.S. Hole drilling apparatus and process for edge mounted RFID tag
US8511570B2 (en) 2008-12-22 2013-08-20 Teknologian Tutkimuskeskus Vtt Transponder, transponder kit, method of applying the transponder and product comprising the transponder
US8836585B2 (en) 2008-12-22 2014-09-16 Teknologian Tutkimuskeskus Vtt Radio-frequency transponder for marking wood products and method of manufacturing thereof
WO2011038743A1 (en) 2009-09-29 2011-04-07 Tallinn University Of Technology Transponder and method for its application
EP2812155A4 (en) * 2012-02-08 2015-11-18 Stanley Black & Decker Inc Hand tool having an electronic identification device

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