SE9504424L - Metod att åstadkomma en svets eller ett klipp medelst ultraljud - Google Patents

Metod att åstadkomma en svets eller ett klipp medelst ultraljud

Info

Publication number
SE9504424L
SE9504424L SE9504424A SE9504424A SE9504424L SE 9504424 L SE9504424 L SE 9504424L SE 9504424 A SE9504424 A SE 9504424A SE 9504424 A SE9504424 A SE 9504424A SE 9504424 L SE9504424 L SE 9504424L
Authority
SE
Sweden
Prior art keywords
pct
ultrasonic horn
date jun
sec
ultrasonic
Prior art date
Application number
SE9504424A
Other languages
English (en)
Other versions
SE505546C2 (sv
SE9504424D0 (sv
Inventor
Robert Kling
Original Assignee
Moelnlycke Ab
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 Moelnlycke Ab filed Critical Moelnlycke Ab
Priority to SE9504424A priority Critical patent/SE505546C2/sv
Publication of SE9504424D0 publication Critical patent/SE9504424D0/sv
Priority to JP52197397A priority patent/JP4058502B2/ja
Priority to US09/091,189 priority patent/US5985065A/en
Priority to PCT/SE1996/001547 priority patent/WO1997021535A1/en
Priority to EP96940739A priority patent/EP0868288B1/en
Priority to DE69606325T priority patent/DE69606325T2/de
Publication of SE9504424L publication Critical patent/SE9504424L/sv
Publication of SE505546C2 publication Critical patent/SE505546C2/sv

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/086—Means for treating work or cutting member to facilitate cutting by vibrating, e.g. ultrasonically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7443—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc by means of ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a sinusoidal wave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1054—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing and simultaneously bonding [e.g., cut-seaming]
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
    • Y10T156/1313—Cutting element simultaneously bonds [e.g., cut seaming]

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
SE9504424A 1995-12-11 1995-12-11 Metod att åstadkomma en svets eller ett klipp medelst ultraljud SE505546C2 (sv)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE9504424A SE505546C2 (sv) 1995-12-11 1995-12-11 Metod att åstadkomma en svets eller ett klipp medelst ultraljud
JP52197397A JP4058502B2 (ja) 1995-12-11 1996-11-26 超音波を用いて材料を溶接または切断する装置と方法
US09/091,189 US5985065A (en) 1995-12-11 1996-11-26 Method of welding or cutting material ultrasonically
PCT/SE1996/001547 WO1997021535A1 (en) 1995-12-11 1996-11-26 A method of welding or cutting material ultrasonically
EP96940739A EP0868288B1 (en) 1995-12-11 1996-11-26 A method of welding or cutting material ultrasonically
DE69606325T DE69606325T2 (de) 1995-12-11 1996-11-26 Verfahren zum schweissen oder schneiden von material mit hilfe von ultraschall

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9504424A SE505546C2 (sv) 1995-12-11 1995-12-11 Metod att åstadkomma en svets eller ett klipp medelst ultraljud

Publications (3)

Publication Number Publication Date
SE9504424D0 SE9504424D0 (sv) 1995-12-11
SE9504424L true SE9504424L (sv) 1997-06-12
SE505546C2 SE505546C2 (sv) 1997-09-15

Family

ID=20400546

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9504424A SE505546C2 (sv) 1995-12-11 1995-12-11 Metod att åstadkomma en svets eller ett klipp medelst ultraljud

Country Status (6)

Country Link
US (1) US5985065A (sv)
EP (1) EP0868288B1 (sv)
JP (1) JP4058502B2 (sv)
DE (1) DE69606325T2 (sv)
SE (1) SE505546C2 (sv)
WO (1) WO1997021535A1 (sv)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6583364B1 (en) * 1999-08-26 2003-06-24 Sony Chemicals Corp. Ultrasonic manufacturing apparatuses, multilayer flexible wiring boards and processes for manufacturing multilayer flexible wiring boards
DE10026142A1 (de) * 2000-05-26 2001-12-13 Basf Ag Verfahren und Vorrichtung zur kontinuierlichen Herstellung von organischen Mono- oder Polyisocyanaten
US6503238B1 (en) 2000-06-16 2003-01-07 Sca Hygiene Products Ab Disposable liquid absorbent article with elasticizing members
DE10029797A1 (de) * 2000-06-16 2001-12-20 Eul & Guenther Gmbh Verfahren und Vorrichtung zum Herstellen mehrlagiger Produkte und zugehöriges Produkt
US20080214967A1 (en) * 2004-02-17 2008-09-04 Ernest Aranyi Ultrasonic surgical instrument
US20040054364A1 (en) * 2002-02-08 2004-03-18 Ernest Aranyi Ultrasonic surgical instrument
CA2437582C (en) 2001-02-08 2009-09-15 Tyco Healthcare Group Lp Ultrasonic surgical instrument
FR2829961B1 (fr) * 2001-09-25 2006-11-10 Clip Off Procede et machine de soudage de deux films par ultrasons
DE10210075B4 (de) * 2002-03-08 2008-04-30 Stapla Ultraschall-Technik Gmbh Vorrichtung zum Abdichten und Trennen eines Rohrabschnitts
US7204899B2 (en) * 2003-04-30 2007-04-17 Kimberly-Clark Worldwide, Inc. Apparatus and method for mechanically bonding and cutting an article
JP4487542B2 (ja) * 2003-11-27 2010-06-23 Ｔｄｋ株式会社 積層セラミック電子部品用の導電体ペーストおよび積層セラミック電子部品用の積層体ユニットの製造方法
JP4662298B2 (ja) * 2003-12-15 2011-03-30 Ｔｄｋ株式会社 積層セラミック電子部品のスペーサ層用の誘電体ペースト
JP4487595B2 (ja) * 2004-02-27 2010-06-23 Ｔｄｋ株式会社 積層セラミック電子部品用の積層体ユニットの製造方法
JP4487596B2 (ja) * 2004-02-27 2010-06-23 Ｔｄｋ株式会社 積層セラミック電子部品用の積層体ユニットの製造方法
JP4412013B2 (ja) * 2004-03-16 2010-02-10 Ｔｄｋ株式会社 積層セラミック電子部品用の誘電体ペーストおよび積層セラミック電子部品用の積層体ユニットの製造方法
DE102004022313B3 (de) * 2004-05-04 2005-10-20 Stapla Ultraschalltechnik Gmbh Vorrichtung und Verfahren zum fluiddichten Dichtschweißen eines Rohrabschnittes
GB2433465B (en) * 2005-12-20 2011-06-08 Bm Polyco Ltd Apparatus for manufacture of an article from non woven sheets
GB2444039A (en) 2006-11-27 2008-05-28 Mars Inc Ultrasonic welding with rotating anvil
GB2484267A (en) * 2010-10-01 2012-04-11 Concepts For Success Ultrasonic welding using helical anvil
JP5728214B2 (ja) * 2010-12-10 2015-06-03 花王株式会社 超音波接合装置、それを用いたウエブの接合方法及びそれを用いたパンツ型着用物品の製造方法
JP2012145490A (ja) * 2011-01-13 2012-08-02 Sankei Engineering:Kk 検査用プローブの製造方法
DE102012002061A1 (de) * 2012-02-03 2013-08-08 Emitec Gesellschaft Für Emissionstechnologie Mbh Dosierventil für einfriergefährdete Additive
GB201211577D0 (en) * 2012-06-29 2012-08-15 Concepts For Success C4S Method and apparatus for the manufacturing of sandwich structures with free flowing materials and such structures
ES2408805B1 (es) * 2013-02-28 2014-04-07 Hostel Drap, S.L. Procedimiento de corte para la obtención de piezas textiles en los procesos de fabricación en continuo
ITTO20130206A1 (it) 2013-03-18 2014-09-19 Cavanna Spa Dispositivo di saldatura ad ultrasuoni
US8961718B2 (en) * 2013-05-08 2015-02-24 Shenzhen China Star Optoelectronics Technology Co., Ltd Apparatus and method for laminating anisotropic conductive film on flat display panel
JP7359341B2 (ja) * 2020-03-13 2023-10-11 精電舎電子工業株式会社 シート材のシールカット方法、およびシート材のシールカット装置
WO2022099382A1 (en) * 2020-11-16 2022-05-19 Merctech Pty Ltd Method of manufacturing a protective gown
GB2606511A (en) * 2021-03-26 2022-11-16 Hs Products Ltd Continuous production of pocketed springs

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US3242029A (en) * 1963-05-13 1966-03-22 Kleer Vu Ind Inc Ultrasonic sealer for sealing plastics
US3993532A (en) * 1974-11-11 1976-11-23 Consolidated Engravers Corporation Ultrasonic sealing pattern roll
US3939033A (en) * 1974-12-16 1976-02-17 Branson Ultrasonics Corporation Ultrasonic welding and cutting apparatus
CH639593A5 (en) * 1980-12-10 1983-11-30 Branson Sonic Power Sa Device for ultrasonically welding the two ends of a band made of thermoplastic material
US4531999A (en) * 1982-01-26 1985-07-30 The Procter & Gamble Company Dynamic laminating method and apparatus for ultrasonically bonding juxtaposed webs
US4430148A (en) * 1982-04-27 1984-02-07 The Procter & Gamble Company Ultrasonic bonding apparatus
US4711693A (en) * 1986-07-07 1987-12-08 Branson Ultrasonics Corp. Anvil for ultrasonic slitting apparatus
US4747895A (en) * 1986-08-20 1988-05-31 American White Cross Laboratories, Inc. Continuous ultrasonic perforating system and method
US4690722A (en) * 1986-10-24 1987-09-01 Branson Ultrasonics Corporation Ultrasonic apparatus for joining and severing sheet material
US5198056A (en) * 1989-04-05 1993-03-30 Sm Engineering Ag Method and device for ultrasonic welding or printing ribbons
EP0391842B1 (de) * 1989-04-05 1992-12-16 Sm Engineering Ag Verfahren und Vorrichtung zum Ultraschallschweissen von Farbbändern
DE19511698C1 (de) * 1995-03-30 1996-08-22 Schober Werkzeug & Maschbau Vorrichtung zum Verbinden einer Siegelfolie mit einer Materialbahn

Also Published As

Publication number Publication date
JP4058502B2 (ja) 2008-03-12
EP0868288A1 (en) 1998-10-07
DE69606325T2 (de) 2000-08-24
SE505546C2 (sv) 1997-09-15
WO1997021535A1 (en) 1997-06-19
EP0868288B1 (en) 2000-01-19
SE9504424D0 (sv) 1995-12-11
JP2000502005A (ja) 2000-02-22
US5985065A (en) 1999-11-16
DE69606325D1 (de) 2000-02-24

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NUG Patent has lapsed