WO1995026883A1 - Reversible thermosensible recording material - Google Patents
Reversible thermosensible recording material Download PDFInfo
- Publication number
- WO1995026883A1 WO1995026883A1 PCT/JP1994/000527 JP9400527W WO9526883A1 WO 1995026883 A1 WO1995026883 A1 WO 1995026883A1 JP 9400527 W JP9400527 W JP 9400527W WO 9526883 A1 WO9526883 A1 WO 9526883A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- layer
- recording material
- reversible thermosensitive
- thermosensitive recording
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/415—Marking using chemicals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/36—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties
- B41M5/363—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties using materials comprising a polymeric matrix containing a low molecular weight organic compound such as a fatty acid, e.g. for reversible recording
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
-
- 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
- G06K19/06009—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 with optically detectable marking
- G06K19/06046—Constructional details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
Definitions
- the present invention relates to a reversible thermosensitive recording material having a cushion layer and capable of repeatedly forming and erasing an image reversibly based on a temperature change.
- the present invention also relates to a magnetic card using the reversible thermosensitive recording material.
- thermosensitive recording materials In recent years, with the progress of thermal heads, the use of thermosensitive recording materials has expanded rapidly.
- magnetic information is often displayed on the card surface as visible information.
- Such a magnetic card is widely used as a high card, a JR orange card, a Zo card, or a prepaid card in department stores, supermarkets and the like.
- the area where visible information can be displayed on such a magnetic force is limited, and in the case of a high-cost prepaid card, information cannot be displayed as the balance is added. is there. In such a case, a new card is usually reissued and the cost is high.
- a reversible recording material that can be repeatedly recorded and erased in the same area a plurality of times. With such materials, old information can be erased and new information can be displayed, so there is no need to reissue a new card after it has been displayed.
- heat-sensitive recording material capable of reversibly recording and erasing such information
- high-quality materials such as polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyester, and polyamide are used.
- a device having a heat-sensitive recording layer in which organic low-molecular substances such as alcohols and higher fatty acids are dispersed has been proposed (JP-A-55-154198).
- the formation and erasing of an image with such a material can be achieved by reversing the heat-sensitive recording layer with temperature. It utilizes the change in brightness. That is, this recording material shows a transparent state at a certain temperature (t, to t) (however, t, c), and shows a cloudy state above the temperature (t).
- a thermal head is preferable, that is, the initial state is made transparent, and by applying a temperature equal to or higher than the thermal head (t), the part becomes cloudy, and characters and patterns are printed.
- the initial state may be made cloudy, and the part may be made transparent by applying a temperature of (t! To t) with a thermal head.
- the temperature in the latter case (t, ') or higher may be added by a heat roll, a thermal head, or the like.
- the most practical method of providing such a reversible recording material on a forceps is to apply directly to a card member.
- an adhesive is used. It is more convenient to bond them together via a.
- the present inventors have attempted to produce a recording material having a reversible thermosensitive recording material on one surface of a substrate and an adhesive layer on the other surface.
- memory cards and IC cards used in electronic notebooks and the like have been provided with a visual display function using such a recording material. Even when pasted through the card, the unevenness and undulation of the card were large, resulting in poor adhesion to the thermal head, causing uneven coloring and blurred characters.
- An object of the present invention is to provide a reversible thermosensitive recording material which can repeatedly form and erase recording reversibly by heat, and which can be easily attached to an object having large irregularities and undulations. It provides a force. Disclosure of the invention
- the present invention relates to a reversible thermosensitive recording material having a substrate and a reversible thermosensitive recording layer containing an organic low-molecular substance provided on the substrate, wherein a cushion layer is provided on a surface opposite to the reversible thermosensitive recording layer.
- the present invention provides a reversible thermosensitive recording material characterized in that an adhesive layer is provided through the layer.
- the heat-sensitive recording layer of the recording material of the present invention can record and erase information repeatedly, and visually record information on the heat-sensitive recording layer using a heating recording device such as a thermal head. It can be carried out. It is also possible to easily rewrite and rewrite information by using the same device to erase and re-record.
- FIG. 1 is a schematic sectional view showing a specific example of the recording material of the present invention
- FIG. 1 is a schematic sectional view showing one specific example of the recording material of the present invention.
- a reversible thermosensitive recording layer 2 is provided on one side of a substrate 1, and an overcoat layer 3 is further provided thereon.
- the back surface of the substrate 1 is composed of a foamed substrate 5 as a cushion layer and adhesive layers 6 and 6 ′ provided on both sides thereof, and is adhered to the substrate 1 via the adhesive layer 6.
- the resin base material used for the reversible thermosensitive recording layer of the recording material of the present invention forms a layer in which an organic low-molecular substance is uniformly dispersed and held, and greatly affects the transparency at the maximum transparency. For this reason, a resin base material having good transparency, mechanical stability, and good film forming property is preferable.
- a resin base material having good transparency, mechanical stability, and good film forming property is preferable.
- a vinyl chloride copolymer such as polyvinyl chloride, a vinyl chloride-vinyl acetate copolymer, a vinyl chloride-vinyl acetate-vinyl alcohol copolymer, and a vinyl chloride-acrylate copolymer.
- Vinylidene chloride-based copolymers such as polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymer, and vinylidene chloride-acrylonitrile copolymer; polyesters, polyamides, and polyvinylformers Acetal resins such as polyester and polyvinyl butyral, and acrylic resins such as polyacrylate, polymethacrylate, and acrylate methacrylate copolymer; silicone resin, polystyrene, and styrene-butadiene copolymer Examples include thermoplastic resins such as coalesced, polyarylates, polycarbonates, polysulfones, aromatic polyamides, phenoxy resins, and cellulosic resins, and other thermosetting resins. These matrix resins can be used alone or in combination of two or more.
- the organic low molecular weight substance to be blended in the heat-sensitive recording layer at least one kind of higher fatty acid, especially higher fatty acid having 16 or more carbon atoms is used.
- higher fatty acids having 16 or more carbon atoms include palmitic acid, margaric acid, stearic acid, nonadecanoic acid, eicosanoic acid, heneicosanoic acid, behenic acid, lignoceric acid, pentacosanoic acid, serotinic acid, heptacosanoic acid , Montanic acid, triacontanoic acid, nonacosanoic acid, melicic acid, 2-hexadecenoic acid, trans-3-hexadecenoic acid, 2-heptadecenoic acid, trans1-2-tactatedecenoic acid, cis1-2- Octadecanoic acid, trans-1 4-octadedecenoic acid, 2-heptadecenoic
- succinic acid glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, pendecane diacid, dodecane diacid, tridecane, etc.
- Pentadecandioic acid Hexadecanedioic acid
- Heptadecandioic acid Octadecandioic acid
- Nonadecandioic acid Jicosantioic acid
- Henicosandiodic acid Docosandioic acid
- Trichosandioic acid Tetracosantonic acid
- Conventionally known components such as pentacosedioic acid and hexacosandioic acid may be added.
- Such low-molecular organic material the general formula: HOOC (CH 2) m - S - (CH 2) n C
- the sulfide represented by 0 OH [wherein, m and n are each independently an integer of 1 to 5] is most preferred.
- sulfide examples include (1,1'-dicarboxy) dimethyl sulfide, (2,2'-dicarboxy) getyl sulfide [thiodipropionic acid], and (3,3'-dicarboxy) dipropyl sulfide.
- the blending ratio of the higher fatty acid to a sulfide such as thiodipropionic acid is 90: 10 to 10: 90, preferably 90: 10 to 30: 70, more preferably 90 to 90 by weight. Is 85:15 to 50:50. If the sulfide is less than the above range, the expansion of the transparent temperature range is not sufficient, while if it is too large, the contrast decreases.
- the blending ratio of the organic low-molecular substance and the resin base material in the heat-sensitive recording layer is preferably about 50 to 160 parts by weight of the resin base material with respect to 100 parts by weight of the organic low-molecular substance. Particularly preferred is 100 to 500 parts by weight.
- the amount of the base material is less than 50 parts by weight, it is difficult to form a film in which the organic low-molecular substance is stably held in the base material.
- the amount of the base material exceeds 160 parts by weight, the amount of the organic low-molecular substance that becomes cloudy is small, and thus the recorded information cannot be clearly read, which is not preferable as a recording material. It is preferable that the organic low-molecular substance is uniformly dispersed in the base material and that the organic low-molecular substance is sufficiently fixed, and may be partially compatible with the base material.
- the thickness of the reversible thermosensitive recording layer in which an organic low-molecular substance is dispersed in such a resin base material varies depending on the application, but is usually preferably 1 to 20 m. If the thickness is less than this range, a sufficient contrast cannot be obtained and it is not practical as a recording material. If the thickness exceeds this range, sufficient heat cannot be transmitted, causing a decrease in contrast.
- Various additives may be added according to the requirements. As additives, lubricants, antistatic agents, plasticizers, dispersants, stabilizers, surfactants, and inorganic or organic fillers may be blended.
- the solvent used for forming the heat-sensitive recording layer may be variously selected depending on the type of the base material and the organic low-molecular substance. Examples thereof include tetrahydrofuran, methylethylketone, methylisobutylketone, black form, carbon tetrachloride, and the like. Examples include ethanol, toluene, and benzene.
- the organic low-molecular substance is precipitated as fine particles and exists in a dispersed state.
- plastic films such as polyethylene terephthalate and polypropylene, paper, synthetic paper, and metal are used.
- a solution in which two components of a resin base material and an organic low-molecular substance are dissolved is prepared, or at least one of the organic low-molecular substances is used.
- a solution of the resin base material is prepared using a solvent that does not dissolve, a low-molecular organic substance is dispersed in fine particles in this solution, and a dispersion liquid in which a high-boiling solvent is dissolved is prepared.
- a reflective layer such as a metal vapor-deposited film such as aluminum or a metal foil may be provided between the reversible thermosensitive recording material and the substrate.
- an adhesive layer is provided via a cushion layer.
- the thickness of the cushion layer should be 0.1 mm or more, preferably 0.2 to 1.5 mm, and the thickness of the adhesive layer should not be affected by unevenness and undulation of the base material. It may be determined as appropriate.
- the cushion layer may be made of a thick Japanese paper, a thick non-woven cloth, a felt, or the like, in addition to the above-mentioned foam (2 to 50 times foam). Further, the cushion layer may be impregnated with an adhesive.
- An overcoat layer may be provided on the heat-sensitive layer.
- the over-coat layer such as, silicon cone type, accession Lil, fluorine, E epoxy-based, organic materials such as urethane or S i 0 2, S i O ,, Mg O, Z n O, T i 0 2, a 1 2 0 3, a 1 N, may be used inorganic substances such as T a 2 0 3.
- a thermosetting resin, an electron beam curable resin, or an ultraviolet curable resin may be used as the overcoat layer.
- Such an overcoat layer can be formed by a conventionally known coating or vacuum deposition method.
- the thickness is 0.1 to 10 m, preferably 0.1 to 5 m. . If the thickness is less than this, the effect of overcoating is small, while if it is more than this, the contrast is reduced, which is not preferable.
- an intermediate layer may be provided between the reversible thermosensitive recording material and the overcoat layer.
- the intermediate layer is made of polyvinyl chloride, polyvinylidene chloride, polyester, polyamide, polyacrylate, polymethacrylate, polystyrene, nitrocellulose, ethylcellulose, polyvinyl alcohol, polyvinyl formal, polyvinyl butyral, etc.
- a thermosetting resin such as a polyimide resin or a polyurethane resin, or a photocurable resin using an ultraviolet ray, an electron beam, or the like may be used.
- the thickness of the intermediate layer is also 0.0 for the same reason as the overcoat layer.
- It is preferably 1 to 10 m, preferably 0.1 to 5 // m.
- the reversible recording material of the present invention is suitably applied particularly to magnetic cards and IC cards.
- the reversible thermosensitive recording layer may be attached to the surface of the card or to the opposite surface. Also, it may be provided on the entire surface of the card or on any part.
- the solution with the above composition was applied on an aluminum-deposited polyethylene terephthalate film (thickness: 100 m) using a wire bar to a dry film thickness of 5 // m. Layer obtained.
- a coating solution consisting of 50 parts of an acrylic UV-curable resin (manufactured by Asahi Denka, BR-370) and 50 parts of methanol is applied so as to have a dry thickness of 1 / m.
- Curing was performed by irradiation (500 mJ).
- a 30 mm thick polyacrylic pressure-sensitive adhesive layer was provided on both sides of a 1.0 mm thick polyethylene foam base material (30 times expanded). A double-sided adhesive sheet was stuck on the entire surface.
- thermosensitive recording material created in this way is attached to the back of the IC card, and the entire surface is printed solid with a line-type thermal head (8 dotZmm, printing energy 0.3 mJ Zdot) to form a color.
- a line-type thermal head (8 dotZmm, printing energy 0.3 mJ Zdot)
- Example 2 Recording was performed in the same manner as in Example 1 except that the above-mentioned reversible thermosensitive recording material with a cushioning adhesive layer was attached to the surface opposite to the magnetic surface of the magnetic card (thickness: 200 ⁇ m) instead of the IC card. The material was mounted on a magnetic card. This was evaluated in the same manner as in Example 1.
- Example 2 In the same manner as in Example 1 except that an epoxy-based adhesive (Araldite (rapid type) manufactured by Showa Polymer Co., Ltd.) was applied to a thickness of 100 m instead of the double-sided adhesive sheet using a foamed base material. To produce a reversible thermosensitive recording material. This was evaluated in the same manner as in Example 1.
- Aldite rapid type manufactured by Showa Polymer Co., Ltd.
- Example 2 The solution of the reversible thermosensitive recording layer used in Example 1 was directly applied on the surface opposite to the magnetic surface of the magnetic card so as to have a dry thickness of 5 m, and an acrylic UV curable resin was used as an overcoat layer. (Asahi Denka Co., Ltd.: BR-370) 5 0 parts of coating solution consisting of methanol 5 0 parts was applied to a dry thickness of 1 cz m, cured by 5 0 O m of JZ cm 2 morphism UV irradiation A sample was prepared and evaluated in the same manner as in Example 2 except for the above. The evaluation was performed as described above.
- the card of Example 1 was uniformly colored (clouded) over the entire surface, whereas the card of Comparative Example 1 was unevenly colored along the unevenness of the substrate. . Also, in the card of Comparative Example 2, when the platen pressure was low, uneven coloring was likely to occur due to curling of the card, whereas no such phenomenon was found in the card of Example 2.
- the reversible thermosensitive recording material of the present invention can be easily recorded and erased by repeated heating, and can be easily attached to an object having a large surface unevenness or undulation. Of visible information can be displayed.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4286831A JPH06115244A (ja) | 1992-09-30 | 1992-09-30 | 可逆性感熱記録材料 |
KR1019950705325A KR100279032B1 (ko) | 1994-03-30 | 1994-03-30 | 가역성감열기록재료,및이를포함하는자기카드및ic카드 |
US08/530,249 US5902768A (en) | 1992-09-30 | 1994-03-30 | Reversible heat-sensitive recording material |
EP94910575A EP0710572B1 (en) | 1992-09-30 | 1994-03-30 | Reversible thermosensible recording material |
DE69412836T DE69412836T2 (de) | 1992-09-30 | 1994-03-30 | Reversibles wärmeempfindliches aufzeichnungsmaterial |
PCT/JP1994/000527 WO1995026883A1 (en) | 1992-09-30 | 1994-03-30 | Reversible thermosensible recording material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4286831A JPH06115244A (ja) | 1992-09-30 | 1992-09-30 | 可逆性感熱記録材料 |
PCT/JP1994/000527 WO1995026883A1 (en) | 1992-09-30 | 1994-03-30 | Reversible thermosensible recording material |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995026883A1 true WO1995026883A1 (en) | 1995-10-12 |
Family
ID=26435278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1994/000527 WO1995026883A1 (en) | 1992-09-30 | 1994-03-30 | Reversible thermosensible recording material |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0710572B1 (ja) |
WO (1) | WO1995026883A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06115244A (ja) * | 1992-09-30 | 1994-04-26 | Nitto Denko Corp | 可逆性感熱記録材料 |
US6013345A (en) * | 1994-12-28 | 2000-01-11 | Oki Electric Industry Co., Ltd. | Card, bonding jig, and card reader-writer |
US6177383B1 (en) | 1998-03-23 | 2001-01-23 | Ricoh Company, Ltd. | Reversible thermosensitive recording medium, and image forming and erasing method |
ES2160031B1 (es) * | 1999-02-01 | 2002-06-16 | Obiol Mendez Juan Antonio | Tarjeta soporte de datos. |
JP2005014302A (ja) * | 2003-06-24 | 2005-01-20 | Sony Corp | 合成樹脂カード及びその製造方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH047991Y2 (ja) * | 1984-12-17 | 1992-02-28 | ||
JPH04201596A (ja) * | 1990-11-30 | 1992-07-22 | Nitto Denko Corp | 磁気カード |
JPH04347684A (ja) * | 1991-05-24 | 1992-12-02 | Ricoh Co Ltd | 可逆性感熱記録材料 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3350821B2 (ja) * | 1991-06-07 | 2002-11-25 | 株式会社リコー | 可逆性感熱記録材料 |
JPH05124382A (ja) * | 1991-11-02 | 1993-05-21 | Nitto Denko Corp | 可逆性感熱記録材料および磁気カード |
JPH05262033A (ja) * | 1992-03-16 | 1993-10-12 | Nitto Denko Corp | 記録シート |
-
1994
- 1994-03-30 EP EP94910575A patent/EP0710572B1/en not_active Expired - Lifetime
- 1994-03-30 WO PCT/JP1994/000527 patent/WO1995026883A1/ja active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH047991Y2 (ja) * | 1984-12-17 | 1992-02-28 | ||
JPH04201596A (ja) * | 1990-11-30 | 1992-07-22 | Nitto Denko Corp | 磁気カード |
JPH04347684A (ja) * | 1991-05-24 | 1992-12-02 | Ricoh Co Ltd | 可逆性感熱記録材料 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0710572A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP0710572A1 (en) | 1996-05-08 |
EP0710572A4 (en) | 1996-10-02 |
EP0710572B1 (en) | 1998-08-26 |
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