EP3286834A1 - Elektroakustisches bauelement mit verbesserter akustik - Google Patents
Elektroakustisches bauelement mit verbesserter akustikInfo
- Publication number
- EP3286834A1 EP3286834A1 EP16701802.7A EP16701802A EP3286834A1 EP 3286834 A1 EP3286834 A1 EP 3286834A1 EP 16701802 A EP16701802 A EP 16701802A EP 3286834 A1 EP3286834 A1 EP 3286834A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wafer
- structures
- electroacoustic
- piezoelectric
- eab
- 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.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02842—Means for compensation or elimination of undesirable effects of reflections
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/08—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of resonators or networks using surface acoustic waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6489—Compensation of undesirable effects
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/06—Forming electrodes or interconnections, e.g. leads or terminals
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/08—Shaping or machining of piezoelectric or electrostrictive bodies
- H10N30/085—Shaping or machining of piezoelectric or electrostrictive bodies by machining
- H10N30/088—Shaping or machining of piezoelectric or electrostrictive bodies by machining by cutting or dicing
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/704—Piezoelectric or electrostrictive devices based on piezoelectric or electrostrictive films or coatings
- H10N30/706—Piezoelectric or electrostrictive devices based on piezoelectric or electrostrictive films or coatings characterised by the underlying bases, e.g. substrates
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/853—Ceramic compositions
- H10N30/8542—Alkali metal based oxides, e.g. lithium, sodium or potassium niobates
Definitions
- Electro-acoustic component having improved acoustic The invention relates to electroacoustic devices having ver ⁇ Patched acoustics, in particular with reduced interference due to substrate edges reflected acoustic waves.
- the invention further relates to RF filters which are realized by such components, wafers for the production of such components and method for the production.
- transducer structures convert between RF signals and acoustic waves (AW).
- the transducer structures include electrode structures, e.g. B. electrode fingers, and are doing with a piezoelectric material, for. B. a piezoelectric wafer connected.
- AW components are used as a band pass filter or band-stop ⁇ .
- the transducer structures and reflector elements then have a spatial periodicity which is essentially determined by the acoustic wavelength ⁇ or ⁇ / 2 associated with the bandpass frequency.
- the back surface of SAW chips can be roughened to disperse the AW.
- this increases the breakage rate of the corresponding substrates.
- the substrate edges can be enveloped by an AW absorbing mass.
- An electro-acoustic device comprises a carrier chip with a piezoelectric material having a piezoelectric axis.
- the device further includes AW transducer structures with electrode fingers disposed on the carrier chip.
- the AW transducer structures are suitable and intended to convert between acoustic waves (AW) and RF signals.
- the electrode fingers are oriented at right angles to the piezoelectric axis.
- the piezoelectric axis does not intersect any of the substrate edges at a right angle.
- the component described Due to the rectangular arrangement of the electrode fingers relative to the piezoelectric axis, the component described has an optimum excitation intensity and an optimal electroacoustic coupling.
- a simple processing at the Her ⁇ position of the component by rectangular cut edges during separation is made possible by a possible rectangular cross-section of the carrier chip.
- Irregularly structured edges help to avoid coherent reflections so that unwanted signals are dissipated.
- the piezoelectric axis is not at right angles or parallel to the substrate edges of the rectangular carrier. gersubstrats is aligned with the interference by reflectors ⁇ oriented AW is improved, and thus obtain an improved elektroakus- diagram component.
- an electroacoustic component is specified in which the electrode fingers are tilted relative to the substrate edges.
- this also entails an increased space requirement, since the generally rectangular shaped component structures, for. B. electroacoustic transducer structures, and the rectangular carrier chip are rotated relative to each other and the component structures can no longer optimally fill the chip.
- the edges of the carrier chip arise areas that can not be used by the electrode fingers, since - in contrast to known methods in which only the electrode fingers are tilted - and the current busbars are rotated relative to the substrate edges.
- Such a device has improved electro-acoustic properties, especially at frequencies just above ei ⁇ ner passband frequency on. So there are embodiments in which the insertion loss is improved by 4.5 dB.
- the piezoelectric axis and a sub ⁇ stratkante include an angle that lies in the interval [80 °, 87 °].
- the transducer structures can be rotated through an angle of between 3 ° (90 ° -87 °) and 10 ° (90 ° -80 °). Then the reduction of the disturbing effects of reflected AW is already relatively high, while the additional space requirement remains relatively low.
- the piezoelectric material is a piezoelectric ⁇ single crystal.
- the electrode fingers and other elements of the transducer structures may be disposed directly on the crystalline piezoelectric material.
- the propagation direction of the AW is preferably parallel to the piezoelectric
- the piezoelectric material is Li aO 3 (lithium tantalate) or Li bO 3 (lithium niobate).
- the übli ⁇ chen crystal cuts for lithium or lithium niobate can be used.
- the transducer structures may include ladder-type structures.
- Ladder-type structures are made up of basic elements with a parallel resonator and a serial resonator.
- DMS structures are generally particularly sensitive to reflected AW.
- Ladder type structures are relatively high performance.
- DMS structures thus results in a particularly high-performance RF filter, which in particular significantly benefits by reducing the disturbance of acoustic waves. It is therefore possible in particular for the electroacoustic component to realize an HF filter circuit or a part of an HF filter circuit.
- An HF filter having corresponding component structures may itself be part of an electroacoustically operating duplexer.
- the deviation from the right angle can correspond to the angle by which the component structures, in particular the Electrode fingers are rotated relative to the substrate edges. This means that the later sawn edges and Ranele ⁇ elements for external connections in accordance with conventional processing steps after the labeling are aligned.
- the problem of twisting is on the An ⁇ bring a quasi twisted mark, which is easier to perform, relocated.
- a method of manufacturing an electroacoustic device or a plurality of electroacoustic devices may include the following steps:
- a corresponding method comprises the steps: Providing a wafer,
- the separation of the chips can be done by sawing the wafer.
- the device structures are rotated relative to the rectangular orientation of the later chip edges by an angle that is in the interval [3 °, 10 °].
- Fig. 2 the relative orientation of the piezoelectric
- FIG. 5 the improvement of the insertion loss in electroacoustic components of the type mentioned above.
- FIG. 1 shows an electroacoustic component EAB in which electroacoustic transducer structures EAWS are arranged on a chip CH.
- the chip includes a piezoelectric mate rial ⁇ with a piezoelectric axis PA.
- the chip CH has a rectangular base with four side edges SK.
- the transducer structures EAWS comprise two current busbars BB and a plurality of electrode fingers EF and reflector elements REF.
- the electrode fingers EF and the reflector elements REF are arranged in the acoustic track of the component EAB.
- the electrode fingers EF are arranged at right angles to the piezoelectric axis PA in order to enable optimum electro-acoustic coupling.
- the side edges SK of the chip CH are rotated by an angle l compared to conventional components.
- the piezoelectric axis thus includes with a side edge SK an angle 2 which deviates by a right angle from al.
- the activistnbe- of the chip may CH is compared to conventional devices increased, since in the area of four chip edges, the surface of the piezoelectric chips can not be used for the wall ⁇ ler Modellen with a rectangular cross-section.
- Figure 2 shows how chip, piezoelectric axis PA and wafer W are aligned relative to each other.
- the electrode fingers on the chip are perpendicular to the piezoelectric axis PA.
- a chip edge encloses with the piezoelectric axis PA an angle a2, which deviates from a right angle.
- the chip CH is thereby sawed out of a wafer W.
- the orientation of the (primary flat) PF of the wafer closes the angle with the piezoelectric axis PA 3 on. If 3 denotes a right angle, then wafer W corresponds to a conventional wafer.
- Figure 3 shows an advantageous wafer W, wherein the Mar- k ist PF is analogous to the side edge of the chip rotated relative to the pie ⁇ zoelektrischen axis PA.
- the marking PF and the piezoelectric axis PA enclose an angle 3, which equals the angle 2, the chip including the edge and the piezoe ⁇ lectric axis PA.
- the angles 2 and 3 deviate from the angle, which is preferably between 3 ° and 10 °, from a right angle.
- the transducer structures can be oriented orthogonally to the piezoelectric axis and obtain a good electro-acoustic coupling.
- FIG. 4 shows how a multiplicity (here four for example) of later chips can be arranged relative to one another and relative to the marking PF of the wafer W.
- a multiplicity here four for example
- Insertion Loss for a variety of conventional devices ILl and a plurality of similar improved devices IL2, in which rectangular Wand ⁇ lerpatenteden are arranged on rectangular chips, the electrode fingers of the transducer structures are aligned perpendicular to the piezoelectric axis and the substrate edges of the chip by a few degrees opposite the piezoelectric Axis are turned.
- the devices achieve this band ⁇ pass filter with a DMS structure and at least one basic element of a ladder-type structure.
- the bandpass filter itself has a passband between 734 MHz and 756 MHz.
- the insertion loss at 790 MHz is improved by 4.5 dB on average.
- the component is not limited to the described Ausry ⁇ tion forms.
- Components include the additional Bauele ⁇ management structures such as additional electrode fingers or reflector elements, also provide exporting according to the invention is approximately shapes.
- EAB electroacoustic component
- EAWS electroacoustic transducer structure
- IL1 insertion loss of conventional components
- IL2 insertion loss of components in which the rectangular chip is twisted relative to the piezoelectric axis
- PA piezoelectric axis
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Ceramic Engineering (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015106191.0A DE102015106191A1 (de) | 2015-04-22 | 2015-04-22 | Elektroakustisches Bauelement mit verbesserter Akustik |
| PCT/EP2016/051810 WO2016169665A1 (de) | 2015-04-22 | 2016-01-28 | Elektroakustisches bauelement mit verbesserter akustik |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3286834A1 true EP3286834A1 (de) | 2018-02-28 |
Family
ID=55237662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16701802.7A Ceased EP3286834A1 (de) | 2015-04-22 | 2016-01-28 | Elektroakustisches bauelement mit verbesserter akustik |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US20180083592A1 (de) |
| EP (1) | EP3286834A1 (de) |
| JP (1) | JP2018513655A (de) |
| KR (1) | KR20170139019A (de) |
| CN (1) | CN107534422A (de) |
| BR (1) | BR112017022597A2 (de) |
| DE (1) | DE102015106191A1 (de) |
| WO (1) | WO2016169665A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI834694B (zh) * | 2018-07-18 | 2024-03-11 | 美商天工方案公司 | 具有積體取消電路之薄膜塊體聲諧振器濾波器 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09116378A (ja) * | 1995-10-20 | 1997-05-02 | Toyo Commun Equip Co Ltd | Idt励振デバイス |
| JP2000341083A (ja) * | 1999-05-25 | 2000-12-08 | Hitachi Media Electoronics Co Ltd | 弾性表面波デバイス |
| US20120313724A1 (en) * | 2009-11-19 | 2012-12-13 | Panasonic Corporation | Elastic wave filter device and antenna duplexer using same |
| DE112011104736T5 (de) * | 2011-01-18 | 2013-10-17 | Murata Manufacturing Co., Ltd. | Oberflächenschallwellenfilterbauelement |
| US20140001917A1 (en) * | 2012-06-28 | 2014-01-02 | Taiyo Yuden Co., Ltd. | Acoustic wave device and method of fabricating the same |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT321367B (de) * | 1970-04-29 | 1975-03-25 | Siemens Ag | Piezoelektrisches Filter nach dem Oberflächenwellenprinzip |
| DE2115412A1 (de) * | 1971-03-30 | 1972-10-12 | Siemens Ag | Piezoelektrisches Filter nach dem Oberfl ächenwellenprinzip |
| GB1440950A (en) * | 1973-10-12 | 1976-06-30 | Mullard Ltd | Acoustic surface-wave devices |
| JPS5515887B2 (de) * | 1974-09-09 | 1980-04-26 | ||
| JPS58120313A (ja) * | 1982-01-13 | 1983-07-18 | Hitachi Ltd | 弾性波装置 |
| DE3230566C2 (de) * | 1982-08-17 | 1987-02-05 | Siemens AG, 1000 Berlin und 8000 München | Mit reflektierten akustischen Wellen arbeitendes elektronisches Bauelement |
| JPH06125235A (ja) * | 1992-10-13 | 1994-05-06 | Hitachi Ltd | 弾性表面波装置及びその製造方法 |
| DE19620940A1 (de) * | 1995-11-17 | 1997-05-22 | Werner Prof Dr Buff | Elektronisches Bauelement und Verfahren zu seiner Herstellung |
| US6287894B1 (en) * | 1999-10-04 | 2001-09-11 | Andersen Laboratories, Inc. | Acoustic device packaged at wafer level |
| JP4069773B2 (ja) * | 2003-03-19 | 2008-04-02 | セイコーエプソン株式会社 | 圧電振動片、圧電振動子および圧電デバイス |
| JP2005204275A (ja) * | 2003-12-12 | 2005-07-28 | Seiko Epson Corp | 弾性表面波素子片およびその製造方法並びに弾性表面波装置 |
| US7385463B2 (en) * | 2003-12-24 | 2008-06-10 | Kyocera Corporation | Surface acoustic wave device and electronic circuit device |
| US8347469B2 (en) * | 2007-03-26 | 2013-01-08 | Citizen Holdings Co., Ltd. | Crystal oscillator piece and method for manufacturing the same |
| CN102334289B (zh) * | 2009-02-27 | 2015-10-07 | 精工爱普生株式会社 | 表面声波谐振器、表面声波振荡器以及电子设备 |
| CN104485918B (zh) * | 2009-06-18 | 2018-01-05 | 天工滤波方案日本有限公司 | 阶梯型弹性波滤波器及使用其的双工器 |
| JP2011182220A (ja) * | 2010-03-02 | 2011-09-15 | Panasonic Corp | 弾性波共振器及びこれを用いた縦結合二重モードフィルタ、ラダー型フィルタ |
| CN103891139B (zh) * | 2011-10-24 | 2016-08-24 | 株式会社村田制作所 | 弹性表面波装置 |
| JP6504551B2 (ja) * | 2013-06-10 | 2019-04-24 | 太陽誘電株式会社 | 共振器、フィルタおよび分波器 |
| JP6274223B2 (ja) * | 2013-12-26 | 2018-02-07 | 株式会社村田製作所 | 弾性波装置及びフィルタ装置 |
| CN107615654B (zh) * | 2015-06-24 | 2020-08-21 | 株式会社村田制作所 | 滤波器装置 |
-
2015
- 2015-04-22 DE DE102015106191.0A patent/DE102015106191A1/de not_active Withdrawn
-
2016
- 2016-01-28 BR BR112017022597A patent/BR112017022597A2/pt not_active IP Right Cessation
- 2016-01-28 WO PCT/EP2016/051810 patent/WO2016169665A1/de not_active Ceased
- 2016-01-28 CN CN201680017736.7A patent/CN107534422A/zh active Pending
- 2016-01-28 JP JP2017555311A patent/JP2018513655A/ja active Pending
- 2016-01-28 EP EP16701802.7A patent/EP3286834A1/de not_active Ceased
- 2016-01-28 US US15/565,259 patent/US20180083592A1/en not_active Abandoned
- 2016-01-28 KR KR1020177029747A patent/KR20170139019A/ko not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09116378A (ja) * | 1995-10-20 | 1997-05-02 | Toyo Commun Equip Co Ltd | Idt励振デバイス |
| JP2000341083A (ja) * | 1999-05-25 | 2000-12-08 | Hitachi Media Electoronics Co Ltd | 弾性表面波デバイス |
| US20120313724A1 (en) * | 2009-11-19 | 2012-12-13 | Panasonic Corporation | Elastic wave filter device and antenna duplexer using same |
| DE112011104736T5 (de) * | 2011-01-18 | 2013-10-17 | Murata Manufacturing Co., Ltd. | Oberflächenschallwellenfilterbauelement |
| US20140001917A1 (en) * | 2012-06-28 | 2014-01-02 | Taiyo Yuden Co., Ltd. | Acoustic wave device and method of fabricating the same |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2016169665A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018513655A (ja) | 2018-05-24 |
| US20180083592A1 (en) | 2018-03-22 |
| WO2016169665A1 (de) | 2016-10-27 |
| CN107534422A (zh) | 2018-01-02 |
| DE102015106191A1 (de) | 2016-10-27 |
| KR20170139019A (ko) | 2017-12-18 |
| BR112017022597A2 (pt) | 2018-07-17 |
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