EP1459116A1 - VERFAHREN ZUM TRENNEN VON LICHTLEITFASERN MITTELS CO sb 2 /sb −LASERSTRAHLUNG - Google Patents
VERFAHREN ZUM TRENNEN VON LICHTLEITFASERN MITTELS CO sb 2 /sb −LASERSTRAHLUNGInfo
- Publication number
- EP1459116A1 EP1459116A1 EP02798296A EP02798296A EP1459116A1 EP 1459116 A1 EP1459116 A1 EP 1459116A1 EP 02798296 A EP02798296 A EP 02798296A EP 02798296 A EP02798296 A EP 02798296A EP 1459116 A1 EP1459116 A1 EP 1459116A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber
- fibers
- optical
- pulse
- separation
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/25—Preparing the ends of light guides for coupling, e.g. cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/30—Organic material
- B23K2103/42—Plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
Definitions
- the invention relates to a method for separating optical fibers by means of CO 2 laser radiation. It can be used for a wide range of such fibers, ranging from monomode to multimode to gradient fibers with a wide variety of user-specific diameters. Coated fibers can also be separated using this method. This method is particularly suitable for the assembly of fiber end faces in plugs or special end faces for the coupling to electro-optical converters of single glass fibers and fiber ribbons. It is characterized by great flexibility, high quality of the separating surfaces and thus low rework, as well as a high working speed and the possibility of automating the separating process.
- a basic problem here is the simple separation due to the high flatness requirements on the end surface that arises, which generally has to enable low-loss coupling of the fiber to other optical or optoelectronic components.
- the C0 2 laser whose radiation is suitable for everyone due to its high absorption, appears to be suitable for laser separation
- Sheathing are used, distinguished.
- the method should be suitable for creating separating surfaces perpendicular to the fiber core but also inclined to the fiber core. The required reworking of the separating surface should be minimal or even be completely eliminated.
- the process should be fully automated.
- This object is achieved for a method for separating optical fibers by means of CO 2 laser radiation in accordance with the preamble of claim 1 in that a working beam 8 consisting of individual pulses with the radiation parameters pulse peak power, a few W ⁇ p ⁇ 1 kW, consists of the CO 2 laser radiation.
- Pulse half-width ⁇ imp, 10- 5 s ⁇ imp ⁇ 10 4 s and pulse repetition frequency fi mp , 100 Hz ⁇ fj mp ⁇ several kHz is coupled out and that the working beam 8 to a fixed optical fiber is focused and moved back and forth in one plane along a processing zone, so that an elementary volume per single pulse, approximately equal to the product of the optical penetration depth d and incident beam cross-section, with a diameter approximately equal to the focus diameter df, but in any case less than 2 df is removed until the optical fiber is completely severed.
- the separation process regardless of the specific nature of the individual fiber to be separated or the fiber composite (object), does not take place "in one go” as a result of intensive radiation from a C0 2 laser, as is known from the prior art for glass, but instead a special pulse regime adapted to the respective material, by means of which the smallest material volumes are removed along a line in a "saw-like” process in a “saw-like” process in an extremely gentle manner for the fiber until the complete separation is achieved.
- This means that the overall cut is made up of a large number of individual cuts.
- the order of magnitude of the removed material volumes is determined from the product of the beam cross-sectional area in the processing plane and the depth of penetration into the material.
- the laser radiation is advantageously focused on the surface of the still unprocessed object and so on shaped so that the Rayleigh length is greater than the overall diameter of the object, the peak power of the impulses and their duration (and thus the impulse energy) are selected such that just such an elementary volume is removed (essentially vaporized) by a pulse to do with an absorption-controlled removal in which the amount of molten material that occurs and thus the tendency to microcracks is minimized.
- the repetition frequency should therefore be sufficiently high, typically in the order of kHz.
- the overlap is advantageously about 70%. If the beam overflows over the single fiber or the fiber composite, a cutting depth is created which does not significantly exceed the depth of penetration of the radiation into the fiber material and thus the order of magnitude of 10 ⁇ m.
- the total separation cut is achieved by a corresponding number of overflows of the jet over the individual fiber or the fiber composite (individual separation cuts).
- the time interval between the generation of the individual separating cuts should be selected so large that the zone last worked on is adequately cooled. This again serves the goal of not generating any larger amounts of melt by impermissibly high summation of the radiation power introduced.
- a cooling time of the order of 10- 2 ... 10- 1 s is advantageous.
- the saw teeth correspond to the radiation pulses and the back and forth movement of the "saw” correspond to the individual overflows of the radiation over the single fiber or the fiber composite.
- the method makes it possible not only to make cuts perpendicular to the fiber axes, but also to open up a wide angular range for the position of the separating surface with respect to the fiber axes. This affects Production of the total separation cut by a large number of individual cut cuts is extremely advantageous in terms of the precision of the desired angle, since the formation of the resulting separation surface is influenced only to a small extent by the surface tension of the melt components occurring during the separation process.
- a further advantage of the method is based on the fact that all components of the fiber configuration in question, that is to say the most varied types of glass, plastics for the cladding or also adhesive, similarly absorb C0 2 laser radiation, so that all of these components with an optimized pulse regime can be separated, whereby the optimization of course focuses primarily on fiber core and fiber cladding.
- Fig. 1 a structure of a coated optical fiber before separation
- Fig. 2 basic structure of an apparatus for performing the method
- Fig. 3 typical pulse train of the incident radiation
- Fig. 5 top view of the kerf - overlap of the individual pulses
- Fig. 6 auxiliary representation to explain the method on a
- Fiber composite Fig. 7 Auxiliary representation to explain the method on a single fiber at a defined angle to the fiber axis
- the basic problem of separating a coated single fiber by means of laser radiation is to be shown with the aid of FIGS. 1 a and 1 b.
- the basic difficulties are firstly the required high precision of the cut and secondly the fact that the optical fiber consisting of a fiber core 1, a fiber jacket 2 and a protective jacket 3 and thus of three different materials is to be separated with the same radiation parameters.
- the separating surface over the fiber core 1 and the fiber jacket 2 will never be ideally flat, but rather have a certain curvature with the arrow height h.
- the arrow height h In order to achieve as flat a separation surface as possible with regard to the fiber coupling, the arrow height h must be kept as small as possible, so that either a reworking of the separation surfaces can be completely dispensed with or the effort required for this is as small as possible. It is crucial for this that the gradual separation takes place by removing individual elementary volumes, each with a pulse regime optimized for the material.
- FIG. 2 a typical basic structure for an apparatus for carrying out the method is illustrated in FIG. 2, which has at least one CO 2 laser 6, a modulator unit 7, a beam collection unit 11, a beam deflection unit 12, an adjustable holding device 14 and a central one Control unit 17 includes.
- the generally continuous radiation 4 from the C0 2 laser 6 is broken down into two beam components by means of the modulator unit 7, which operates in the "double transmission" mode, a working beam 8 and a residual beam 9 (cf. patent DE 40 4 744 C 2).
- Pulses are periodically coupled out of the laser beam 4, the parameters of which vary widely Limits vary and can be optimally adapted to the respective separation process.
- the residual beam 9 is intercepted by a beam collection unit 12, which is either simply an absorber that destroys the radiation, or a measuring device with which, for example, the constancy of the radiation power can be monitored online.
- the working beam 8 is directed into a beam deflection unit 12 by a beam guiding unit 10, symbolized by a mirror.
- This can advantageously be a scanner with an integrated focusing device (for example with an F- ⁇ lens), which ensures the required rapid movement of the focused working beam 8 by a deflection angle ⁇ over the object 13 to be processed.
- the object 13 to be processed can be a single optical fiber (single fiber) with and without a sheathing, a bundle of optical fibers (fiber composite) with and without a sheathing, or else fiber components.
- the object 13 is fixed on an adjustable precision holder 14 which, on the one hand, permits precise xy positioning, for example in the accuracy range 1/100 mm of the object, and on the other hand enables the setting of defined angles ⁇ between the fiber axis and the irradiation plane and thus enables precise bevel cuts.
- this basic structure can be supplemented by a feed device 15 and a discharge device 16, so that the entire process can run automatically.
- the central control unit 17 ensures the timed control of all relevant components.
- the correct choice of the pulse parameters of the working beam 8 plays a central role in the process.
- FIG. 3 illustrates a characteristic pulse train that is generated in the modulator 7 and used as a working beam 8 for the separation process.
- the relevant parameters of the pulse train - pulse peak power p, pulse half-width ⁇ imp and pulse repetition frequency fimp - can be varied within wide limits using the modulator technology used and optimized for separating the respective object. Typical parameter ranges are: some W ⁇ p ⁇ 1 kW
- the pulse parameters are selected depending on the material parameters of the object to be separated so that the one absorbed by the object
- Radiant power per pulse heats a thin surface layer of a few ⁇ m (optical penetration depth d) to its evaporation temperature.
- the evaporation also expels the melt fractions formed in the edge region of the evaporation zone.
- Material vapor and the melt components can be cleaned by blowing the sample with a working gas, for example, is suitable for glass fibers
- Compressed air at approx. 1 bar working pressure can be supported.
- the expulsion per pulse represents the elementary volume defined above approximately the same product of the optical penetration depth d and incident
- the modulated working beam 8 focused on the surface of the still unprocessed single fiber is moved over the single fiber by pivoting the working beam 8 back and forth by the deflection angle winkel.
- At each sweep material is removed approximately around the optical penetration depth d in the order of 10- 5 m, hereinafter referred to as partial section.
- the Rayleigh length z R of the focused beam - it characterizes the area of the beam caustic in which the intensity varies by a maximum of a factor of 2 - should be greater than the total diameter D of the fiber. This ensures that the Beam diameter in the respective working plane is always less than 2 df.
- FIG. 5 shows the top view of the kerf approximately at the stage of the separation process, which corresponds to the cutting of half the fiber cross section.
- Another relevant process parameter here is the distance a from adjacent elementary volumes, that is to say the overlap of the individual pulses, which should typically be approximately 70%.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Laser Beam Processing (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10164579 | 2001-12-28 | ||
DE10164579A DE10164579C1 (de) | 2001-12-28 | 2001-12-28 | Verfahren zum Trennen von Lichtleitfasern mittels CO¶2¶-Laserstrahlung |
PCT/DE2002/004693 WO2003056372A1 (de) | 2001-12-28 | 2002-12-17 | Verfahren zum trennen von lichtleitfasern mittels co2-laserstrahlung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1459116A1 true EP1459116A1 (de) | 2004-09-22 |
Family
ID=7711210
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02798296A Withdrawn EP1459116A1 (de) | 2001-12-28 | 2002-12-17 | VERFAHREN ZUM TRENNEN VON LICHTLEITFASERN MITTELS CO sb 2 /sb −LASERSTRAHLUNG |
Country Status (6)
Country | Link |
---|---|
US (1) | US20050105871A1 (de) |
EP (1) | EP1459116A1 (de) |
JP (1) | JP2005513571A (de) |
AU (1) | AU2002363842A1 (de) |
DE (1) | DE10164579C1 (de) |
WO (1) | WO2003056372A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7216512B2 (en) | 2003-10-31 | 2007-05-15 | Corning Cable Systems, Llc | Method of making an optical fiber by laser cleaving |
EP1614499A1 (de) * | 2004-07-09 | 2006-01-11 | Advanced Laser Separation International (ALSI) B.V. | Laserschneidverfahren und Vorrichtung zur Durchführung des Verfahrens |
FR2903923B1 (fr) * | 2006-07-20 | 2008-09-26 | Ly Son | Systeme laser a noyau focal pour le travail thermique tel que le coupage, le percage, le soudage, le marquage et le traitement de surface de corps solide comme du metal. |
US20100102045A1 (en) * | 2007-02-13 | 2010-04-29 | Lasag Ag | Method of cutting parts to be machined using a pulsed laser |
WO2010020048A1 (en) | 2008-08-19 | 2010-02-25 | Belden Cdt (Canada) Inc. | Slide actuated field installable fiber optic connector |
US7811006B2 (en) * | 2008-09-02 | 2010-10-12 | Belden CD (Canada) Inc. | Field installable fiber optic connector and installation tool |
DE102009020365A1 (de) * | 2009-05-07 | 2010-11-11 | Jenoptik Automatisierungstechnik Gmbh | Verfahren zur Herstellung von Dünnschichtsolarzellenmodulen mit einer vorbestimmten Transparenz |
WO2018213294A1 (en) * | 2017-05-15 | 2018-11-22 | The Trustees Of The University Of Pennsylvania | Systems and methods for laser cleaving diamonds |
US11640031B2 (en) * | 2020-05-27 | 2023-05-02 | Corning Research & Development Corporation | Laser-cleaving of an optical fiber array with controlled cleaving angle |
US11774676B2 (en) * | 2020-05-27 | 2023-10-03 | Corning Research & Development Corporation | Laser-cleaving of an optical fiber array with controlled cleaving angle |
DE102021103450B4 (de) | 2021-02-15 | 2023-10-12 | André LeGuin | Verfahren zum Teilen eines Glaskörpers |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1246481A (en) * | 1968-03-29 | 1971-09-15 | Pilkington Brothers Ltd | Improvements in or relating to the cutting of glass |
DE2813302C2 (de) * | 1978-03-28 | 1979-09-13 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V., 8000 Muenchen | Verfahren und Vorrichtung zum geradlinigen Schneiden von Flachglas mit Hilfe von thermisch induzierten Spannungen |
US4467168A (en) * | 1981-04-01 | 1984-08-21 | Creative Glassworks International | Method of cutting glass with a laser and an article made therewith |
US4710605A (en) * | 1985-04-08 | 1987-12-01 | American Telephone And Telegraph Company, At&T Bell Laboratories | Laser nibbling of optical waveguides |
DE69013047T2 (de) * | 1989-05-08 | 1995-04-13 | Philips Nv | Verfahren zum Spalten einer Platte aus sprödem Werkstoff. |
DE4012510A1 (de) * | 1990-04-12 | 1991-10-17 | Siemens Ag | Verfahren zum konfektionieren eines lichtwellenleiterschalters |
US5233327A (en) * | 1991-07-01 | 1993-08-03 | International Business Machines Corporation | Active resistor trimming by differential annealing |
US5368900A (en) * | 1991-11-04 | 1994-11-29 | Motorola, Inc. | Multistep laser ablation method for making optical waveguide reflector |
JPH05142490A (ja) * | 1991-11-25 | 1993-06-11 | Fuji Xerox Co Ltd | 非線形周波数特性を有するレーザ走査光学系 |
US5268556A (en) * | 1992-11-18 | 1993-12-07 | At&T Bell Laboratories | Laser welding methods |
DE4305107C2 (de) * | 1993-02-19 | 1995-02-23 | Fraunhofer Ges Forschung | Verfahren und Vorrichtung zum Schneiden eines spröden Körpers mit Laserstrahlung |
US5860968A (en) * | 1995-11-03 | 1999-01-19 | Luxar Corporation | Laser scanning method and apparatus |
EP0987570A1 (de) * | 1998-09-18 | 2000-03-22 | The Whitaker Corporation | Verfahren zum Schneiden einer optischen Faser |
US6246026B1 (en) * | 1998-09-18 | 2001-06-12 | The Whitaker Corporation | Process for cutting an optical fiber |
DE19911981B4 (de) * | 1999-03-17 | 2005-09-22 | Tyco Electronics Logistics Ag | Verfahren zur Endflächenbearbeitung von Kunststoff-Lichtwellenleitern |
US6497701B2 (en) * | 1999-04-30 | 2002-12-24 | Visx, Incorporated | Method and system for ablating surfaces with partially overlapping craters having consistent curvature |
-
2001
- 2001-12-28 DE DE10164579A patent/DE10164579C1/de not_active Expired - Fee Related
-
2002
- 2002-12-17 EP EP02798296A patent/EP1459116A1/de not_active Withdrawn
- 2002-12-17 WO PCT/DE2002/004693 patent/WO2003056372A1/de not_active Application Discontinuation
- 2002-12-17 US US10/500,090 patent/US20050105871A1/en not_active Abandoned
- 2002-12-17 AU AU2002363842A patent/AU2002363842A1/en not_active Abandoned
- 2002-12-17 JP JP2003556838A patent/JP2005513571A/ja not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO03056372A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2005513571A (ja) | 2005-05-12 |
AU2002363842A1 (en) | 2003-07-15 |
WO2003056372A1 (de) | 2003-07-10 |
US20050105871A1 (en) | 2005-05-19 |
DE10164579C1 (de) | 2003-08-21 |
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