EP0632522A1 - Lentille diélectrique pour une antenne et procédé de fabrication associé - Google Patents
Lentille diélectrique pour une antenne et procédé de fabrication associé Download PDFInfo
- Publication number
- EP0632522A1 EP0632522A1 EP94110099A EP94110099A EP0632522A1 EP 0632522 A1 EP0632522 A1 EP 0632522A1 EP 94110099 A EP94110099 A EP 94110099A EP 94110099 A EP94110099 A EP 94110099A EP 0632522 A1 EP0632522 A1 EP 0632522A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radome
- dielectric lens
- antenna
- specified
- dielectric
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000011324 bead Substances 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 claims 1
- 238000000151 deposition Methods 0.000 claims 1
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 239000004793 Polystyrene Substances 0.000 description 7
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 7
- 229920002223 polystyrene Polymers 0.000 description 7
- -1 for example Polymers 0.000 description 6
- 238000000748 compression moulding Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000004088 foaming agent Substances 0.000 description 4
- 239000011800 void material Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000001273 butane Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- AOWKSNWVBZGMTJ-UHFFFAOYSA-N calcium titanate Chemical compound [Ca+2].[O-][Ti]([O-])=O AOWKSNWVBZGMTJ-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
- H01Q15/08—Refracting or diffracting devices, e.g. lens, prism formed of solid dielectric material
Definitions
- the present invention relates to a dielectric lens, and more particularly to a dielectric lens used as an element of an antenna for receiving microwave for communication and broadcasting.
- a dielectric lens used as an element of an antenna for receiving microwave of 5GHz or more is conventionally produced by: mixing a resin, for example, polypropylene, polyethylene, polystyrene or the like, with ceramic powder, which acts as a foaming agent and as a dielectric constant conditioner; and molding the mixture into a dome.
- a resin for example, polypropylene, polyethylene, polystyrene or the like
- ceramic powder which acts as a foaming agent and as a dielectric constant conditioner
- the dielectric lens is molded to be thick and accordingly to be heavy. For example, if a mixture of polypropylene and ceramic powder is molded into a dome which is about 180mm in diameter and about 76mm in height, the weight will be about 1kg. Thus, a large quantity of resin is necessary, and the cost of the dielectric lens is high.
- the thickly molded dielectric lens is likely to have a defect such as a sink mark and a swirl mark on the surface (radome layer) and a void inside.
- the defect can be fairly avoided by adopting injection compression molding.
- the injection compression molding requires a mold of a complicated structure and expensive facilities. Even in the injection compression molding, it is difficult to completely prevent occurrence of a sink mark, a swirl mark and a void. Further, a product by the injection compression molding has residual stress, which is a cause of deflection.
- An object of the present invention is to provide a light and inexpensive dielectric lens which does not have a defect such as a sink mark, a swirl mark and a void.
- Another object of the present invention is to provide a simple manufacturing process of a dielectric lens which does not require expensive facilities.
- a dielectric lens according to the present invention comprises a radome which is molded as a dome shell of a specified size, and a foamy body with a specified dielectric constant which is mounted in the radome.
- the foamy body consists essentially of preexpanded beads.
- a specified quantity of preexpanded beads are deposited in the radome, and the radome is closed with a lid.
- the preexpanded beads are deposited in a mold and are fusion-molded into a body which has a curved surface identical with the inner surface of the radome. Then, the fusion-molded body is mounted in the radome, and the radome is closed with a lid.
- the radome and the foamy body are molded separately, and the produced lens is less likely to have a sink mark, a swirl mark and/or a void compared with a conventional dielectric lens produced by integral molding. Also, since preexpanded beads are used for the foamy body, only a small quantity of resin is necessary, thereby lessening the weight.
- the radome is formed by ordinary thinwall injection molding, and the foamy body is formed by ordinary foaming. Therefore, such expensive facilities as to be used for injection compression molding are not required, and the cost for facilities is low.
- a dielectric lens according to the present invention and a manufacturing process thereof are hereinafter described with reference to the accompanying drawings.
- numeral 1 denotes a radome
- numeral 5 denotes a lid
- numeral 10 denotes a foamy body.
- the radome 1 is molded as a dome shell of a specified size.
- the foamy body 10 has a curved surface which is identical with the inner surface of the radome 1 such that the foamy body 10 will be mounted in the radome 1 with no space in-between.
- the foamy body 10 is produced by the following process.
- an aliphatic hydrocarbon for example, hexane, butane, pentane or the like, is impregnated into polymer particles of polystyrene.
- a dielectric constant conditioner is added, and the polystyrene is preexpanded.
- polystyrene preexpanded beads are obtained.
- the preexpanded beads are deposited in a mold and are fusion-molded.
- the inner surface of the mold is identical with the inner surface of the radome 1 such that the fusion-molded body 10 can be mounted in the radome 1 with no space in-between.
- the radome 1 and the lid 5 are made thin, out of the same polystyrene used for the foamy body 10 by a conventional method such as injection molding.
- the foamy body 10 is mounted in the radome 1, and the lid 5 is set at the opening of the radome 1.
- a dielectric lens is assembled.
- the radome 1 and the lid 5 are preferably bonded airtight by an adhesive or by ultrasonic welding.
- the radome 1 is desirably thin for a high antenna gain and is made to be 2mm, and more desirably 1mm or less, in thickness. In point of the antenna gain, it is further preferred that the space between the radome 1 and the foamy body 10 is not more than 0.5mm. If a pigment such as titanium oxide is added to the material of the radome 1, the radome 1 will absorb ultraviolet rays, which helps the foamy body 10 maintain its characteristic and lengthens the life of the lens.
- the followings are exemplary constituents of the foamy body 10.
- resin polystyrene at a mixing ratio by weight of 100 dielectric constant conditioner: calcium titanate at a mixing ratio by weight of 60 foaming agent: butane
- dielectric constant conditioner and the foaming agent were added to the resin, and the resin was preexpanded at an expansion ratio of 15. Then, the preexpanded resin was fusion-molded.
- a foamy body 10 which has a dielectric constant of 1.5 and has a weight of 250g was produced.
- the preexpanded beads are deposited directly in the radome 1, and the radome 1 is closed with the lid 5.
- the constituents of the materials of the radome 1, the lid 5 and the foamy body 10 are not limited to those described above.
- the resin polystyrene, polypropylene, polyethylene, etc. can be used.
- the foaming agent butane, pentane, etc. can be used.
- the dielectric constant conditioner calcium titanate, barium titanate, etc. can be used.
Landscapes
- Aerials With Secondary Devices (AREA)
- Details Of Aerials (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5161006A JPH0722834A (ja) | 1993-06-30 | 1993-06-30 | アンテナ用誘電体レンズ及びその製造方法 |
| JP161006/93 | 1993-06-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0632522A1 true EP0632522A1 (fr) | 1995-01-04 |
| EP0632522B1 EP0632522B1 (fr) | 1999-02-03 |
Family
ID=15726792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94110099A Expired - Lifetime EP0632522B1 (fr) | 1993-06-30 | 1994-06-29 | Lentille diélectrique pour une antenne et procédé de fabrication associé |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0632522B1 (fr) |
| JP (1) | JPH0722834A (fr) |
| DE (1) | DE69416347T2 (fr) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2777117A1 (fr) * | 1998-04-06 | 1999-10-08 | Alsthom Cge Alcatel | Lentille spherique focalisante multicouches |
| EP0969550A1 (fr) * | 1998-06-29 | 2000-01-05 | Murata Manufacturing Co., Ltd. | Lentille diélectrique et dispositif radio comportant une telle lentille |
| EP0903807A3 (fr) * | 1997-09-18 | 2000-07-05 | Robert Bosch Gmbh | Procédé pour fabriquer une lentille pour une antenne |
| WO2000076027A1 (fr) * | 1999-06-07 | 2000-12-14 | Spike Broadband Systems, Inc. | Lentilles a gradient symetrique sur le plan axial et systemes d'antennes correspondants |
| FR2804249A1 (fr) * | 2000-01-26 | 2001-07-27 | Thomson Multimedia Sa | Dispositif d'emission et/ou de reception d'ondes electromagnetiques comprenant une lentille comportant un volume conforme de materiau dielectrique |
| EP1089377A3 (fr) * | 1999-09-30 | 2003-10-29 | Kabushiki Kaisha Toshiba | Dispositif d'antenne |
| EP1653559A4 (fr) * | 2003-07-31 | 2006-11-15 | Sumitomo Electric Industries | Lentille luneberg et son emploi dans un dispositif a antenne |
| EP1750329A1 (fr) * | 2005-07-30 | 2007-02-07 | Hella KG Hueck & Co. | Radome pour une système de radar d'une vehicule et procédé de fabrication d'un radome |
| WO2016113328A1 (fr) | 2015-01-14 | 2016-07-21 | Synthos S.A. | Utilisation de minéraux de structure pérovskite dans une mousse de polymère aromatique vinylique |
| EP3245247B1 (fr) | 2015-01-14 | 2018-12-26 | Synthos S.A. | Combinaison de silice et de graphite et son utilisation pour diminuer la conductivité thermique de mousse en polymère vinyle aromatique |
| US10639829B2 (en) | 2015-01-14 | 2020-05-05 | Synthos S.A. | Process for the production of expandable vinyl aromatic polymer granulate having decreased thermal conductivity |
| US10961154B2 (en) | 2015-01-14 | 2021-03-30 | Synthos S.A. | Geopolymer composite and expandable vinyl aromatic polymer granulate and expanded vinyl aromatic polymer foam comprising the same |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001279014A (ja) * | 2000-03-31 | 2001-10-10 | Achilles Corp | 改良された寸法安定性を有する誘電発泡成形品 |
| JP3521845B2 (ja) * | 2000-05-12 | 2004-04-26 | 日本電気株式会社 | 誘電体レンズ及びその製造方法 |
| US20060165971A1 (en) * | 2003-03-11 | 2006-07-27 | Masatoshi Kuroda | Luneberg lens and process for producing the same |
| US7301504B2 (en) | 2004-07-14 | 2007-11-27 | Ems Technologies, Inc. | Mechanical scanning feed assembly for a spherical lens antenna |
| CN104149228B (zh) * | 2014-07-08 | 2016-08-24 | 中国电子科技集团公司第二十研究所 | 一种玻璃钢天线罩的一体化成型模具及成型方法 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3917773A (en) * | 1973-12-26 | 1975-11-04 | Us Navy | Method for fabricating a shaped dielectric antenna lens |
| US4288337A (en) * | 1977-05-02 | 1981-09-08 | Tokyo Keiki Company Limited | Lightweight materials having a high dielectric constant and their method of manufacture |
| US4482513A (en) * | 1981-03-10 | 1984-11-13 | General Dynamics, Pomona Division | Method of molding foam/aluminum flake microwave lenses |
| US4640280A (en) * | 1985-08-12 | 1987-02-03 | Rca Corporation | Microwave hyperthermia with dielectric lens focusing |
| WO1989008932A1 (fr) * | 1988-02-23 | 1989-09-21 | The Secretary Of State For Defence In Her Britanni | Antenne a lentille dielectrique pleine |
| WO1993010572A1 (fr) * | 1991-11-19 | 1993-05-27 | Thomson Consumer Electronics S.A. | Materiau delectrique pour antennes |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50116259A (fr) * | 1974-02-26 | 1975-09-11 | ||
| JPS5122355A (en) * | 1974-08-19 | 1976-02-23 | Nippon Electric Co | Hanshaban oyobisono seizohoho |
| US4550003A (en) * | 1983-12-13 | 1985-10-29 | Asahi Kasei Kogyo Kabushiki Kaisha | Vinylidene chloride type resin expandable particles, foam particles, in-mold foam molding by use thereof and process for producing them |
| GB8603206D0 (en) * | 1986-02-10 | 1986-03-19 | Ca Minister Nat Defence | Projectile |
| JPS63300608A (ja) * | 1987-05-29 | 1988-12-07 | Mitsubishi Electric Corp | アンテナ装置 |
| JPH0380604A (ja) * | 1989-08-23 | 1991-04-05 | Murata Mfg Co Ltd | 誘電体レンズアンテナ |
| JPH03103608U (fr) * | 1990-02-13 | 1991-10-28 | ||
| JP2738143B2 (ja) * | 1990-10-31 | 1998-04-08 | 日本電気株式会社 | 衛星受信アンテナ |
| JPH0548318A (ja) * | 1991-08-20 | 1993-02-26 | Murata Mfg Co Ltd | レンズアンテナ |
| JPH0548319A (ja) * | 1991-08-20 | 1993-02-26 | Murata Mfg Co Ltd | レンズアンテナ |
| JP3227910B2 (ja) * | 1993-06-30 | 2001-11-12 | 株式会社村田製作所 | 誘電体レンズの製造方法 |
| JPH0716861A (ja) * | 1993-06-30 | 1995-01-20 | Murata Mfg Co Ltd | 誘電体アンテナ素子の製造方法 |
-
1993
- 1993-06-30 JP JP5161006A patent/JPH0722834A/ja active Pending
-
1994
- 1994-06-29 DE DE1994616347 patent/DE69416347T2/de not_active Expired - Fee Related
- 1994-06-29 EP EP94110099A patent/EP0632522B1/fr not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3917773A (en) * | 1973-12-26 | 1975-11-04 | Us Navy | Method for fabricating a shaped dielectric antenna lens |
| US4288337A (en) * | 1977-05-02 | 1981-09-08 | Tokyo Keiki Company Limited | Lightweight materials having a high dielectric constant and their method of manufacture |
| US4482513A (en) * | 1981-03-10 | 1984-11-13 | General Dynamics, Pomona Division | Method of molding foam/aluminum flake microwave lenses |
| US4640280A (en) * | 1985-08-12 | 1987-02-03 | Rca Corporation | Microwave hyperthermia with dielectric lens focusing |
| WO1989008932A1 (fr) * | 1988-02-23 | 1989-09-21 | The Secretary Of State For Defence In Her Britanni | Antenne a lentille dielectrique pleine |
| WO1993010572A1 (fr) * | 1991-11-19 | 1993-05-27 | Thomson Consumer Electronics S.A. | Materiau delectrique pour antennes |
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0903807A3 (fr) * | 1997-09-18 | 2000-07-05 | Robert Bosch Gmbh | Procédé pour fabriquer une lentille pour une antenne |
| FR2777117A1 (fr) * | 1998-04-06 | 1999-10-08 | Alsthom Cge Alcatel | Lentille spherique focalisante multicouches |
| EP0949710A1 (fr) * | 1998-04-06 | 1999-10-13 | Alcatel | Lentille sphérique focalisante multicouches |
| WO1999052180A1 (fr) * | 1998-04-06 | 1999-10-14 | Alcatel | Lentille spherique focalisante multicouches |
| US6229500B1 (en) | 1998-04-06 | 2001-05-08 | Alcatel | Multilayer focusing spherical lens |
| EP0969550A1 (fr) * | 1998-06-29 | 2000-01-05 | Murata Manufacturing Co., Ltd. | Lentille diélectrique et dispositif radio comportant une telle lentille |
| US6175335B1 (en) * | 1998-06-29 | 2001-01-16 | Murata Manufacturing Co., Ltd. | Dielectric lens antenna having heating body and radio equipment including the same |
| WO2000076027A1 (fr) * | 1999-06-07 | 2000-12-14 | Spike Broadband Systems, Inc. | Lentilles a gradient symetrique sur le plan axial et systemes d'antennes correspondants |
| EP1089377A3 (fr) * | 1999-09-30 | 2003-10-29 | Kabushiki Kaisha Toshiba | Dispositif d'antenne |
| FR2804249A1 (fr) * | 2000-01-26 | 2001-07-27 | Thomson Multimedia Sa | Dispositif d'emission et/ou de reception d'ondes electromagnetiques comprenant une lentille comportant un volume conforme de materiau dielectrique |
| EP1120857A3 (fr) * | 2000-01-26 | 2001-09-19 | THOMSON multimedia | Dispositif d'émission et/ou réception d'ondes électromagnétiques comprenant une lentille en matériau diélectrique de volume conforme |
| US6426731B2 (en) | 2000-01-26 | 2002-07-30 | Thomson Licensing, Sa | Device for emitting and/or receiving electromagnetic waves comprising a lens made of a shaped volume of dielectric material |
| EP1653559A4 (fr) * | 2003-07-31 | 2006-11-15 | Sumitomo Electric Industries | Lentille luneberg et son emploi dans un dispositif a antenne |
| EP1750329A1 (fr) * | 2005-07-30 | 2007-02-07 | Hella KG Hueck & Co. | Radome pour une système de radar d'une vehicule et procédé de fabrication d'un radome |
| WO2016113328A1 (fr) | 2015-01-14 | 2016-07-21 | Synthos S.A. | Utilisation de minéraux de structure pérovskite dans une mousse de polymère aromatique vinylique |
| CN107428979A (zh) * | 2015-01-14 | 2017-12-01 | 西索斯公司 | 具有钙钛矿结构的矿物质在乙烯基芳香族聚合物泡沫中的使用 |
| EP3245242B1 (fr) | 2015-01-14 | 2018-08-29 | Synthos S.A. | Utilisation d'un minéral présentant une structure pérovskite dans une mousse de polymère aromatique de vinyle |
| EP3245247B1 (fr) | 2015-01-14 | 2018-12-26 | Synthos S.A. | Combinaison de silice et de graphite et son utilisation pour diminuer la conductivité thermique de mousse en polymère vinyle aromatique |
| US10639829B2 (en) | 2015-01-14 | 2020-05-05 | Synthos S.A. | Process for the production of expandable vinyl aromatic polymer granulate having decreased thermal conductivity |
| US10808093B2 (en) | 2015-01-14 | 2020-10-20 | Synthos S.A. | Combination of silica and graphite and its use for decreasing the thermal conductivity of vinyl aromatic polymer foam |
| US10961154B2 (en) | 2015-01-14 | 2021-03-30 | Synthos S.A. | Geopolymer composite and expandable vinyl aromatic polymer granulate and expanded vinyl aromatic polymer foam comprising the same |
| CN107428979B (zh) * | 2015-01-14 | 2021-06-08 | 西索斯公司 | 具有钙钛矿结构的矿物质在乙烯基芳香族聚合物泡沫中的使用 |
| US11267170B2 (en) | 2015-01-14 | 2022-03-08 | Synthos S.A. | Process for the production of expandable vinyl aromatic polymer granulate having decreased thermal conductivity |
| US11447614B2 (en) | 2015-01-14 | 2022-09-20 | Synthos S.A. | Combination of silica and graphite and its use for decreasing the thermal conductivity of vinyl aromatic polymer foam |
| US11708306B2 (en) | 2015-01-14 | 2023-07-25 | Synthos S.A. | Geopolymer composite and expandable vinyl aromatic polymer granulate and expanded vinyl aromatic polymer foam comprising the same |
| US11859066B2 (en) | 2015-01-14 | 2024-01-02 | Synthos S.A. | Use of a mineral having perovskite structure in vinyl aromatic polymer foam |
| US12195397B2 (en) | 2015-01-14 | 2025-01-14 | Synthos S.A. | Geopolymer composite and expandable vinyl aromatic polymer granulate and expanded vinyl aromatic polymer foam comprising the same |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69416347T2 (de) | 1999-07-15 |
| DE69416347D1 (de) | 1999-03-18 |
| EP0632522B1 (fr) | 1999-02-03 |
| JPH0722834A (ja) | 1995-01-24 |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB |
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