BR9908236A - Laser de fibra - sensor de pressão - Google Patents

Laser de fibra - sensor de pressão

Info

Publication number
BR9908236A
BR9908236A BR9908236-5A BR9908236A BR9908236A BR 9908236 A BR9908236 A BR 9908236A BR 9908236 A BR9908236 A BR 9908236A BR 9908236 A BR9908236 A BR 9908236A
Authority
BR
Brazil
Prior art keywords
fiber
pressure sensor
fiber laser
sensory
frequency
Prior art date
Application number
BR9908236-5A
Other languages
English (en)
Inventor
Klaus Bohnert
Hubert Braendle
Original Assignee
Abb Research Ltd
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 Abb Research Ltd filed Critical Abb Research Ltd
Publication of BR9908236A publication Critical patent/BR9908236A/pt

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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
    • G02B6/02195—Refractive index modulation gratings, e.g. Bragg gratings characterised by means for tuning the grating
    • G02B6/022—Refractive index modulation gratings, e.g. Bragg gratings characterised by means for tuning the grating using mechanical stress, e.g. tuning by compression or elongation, special geometrical shapes such as "dog-bone" or taper
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
    • G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
    • G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
    • G01D5/3538—Optical fibre sensor using a particular arrangement of the optical fibre itself using a particular type of fiber, e.g. fibre with several cores, PANDA fiber, fiber with an elliptic core or the like
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
    • G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
    • G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
    • 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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
    • G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
    • G02B6/02085—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the grating profile, e.g. chirped, apodised, tilted, helical
    • 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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/105—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Optical Transform (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

Patente de Invenção: <B>"LASER DE FIBRA - SENSOR DE PRESSãO"<D>. A presente invenção tem por objeto um sensor de pressão de laser de fibra de freq³ência codificada (1) que está adaptado especialmente para medir pressões isotrópicas em poços de produção petrolífera. O princípo sensorial de acordo com a invenção reside no fato de que em um laser de fibra (2) dotado de Er^ 3+^ está integrada uma fibra sensorial (5, 5a, 5b) unibimodal, cujo duplo fracionamento dependente de pressão resulta em uma defasagem de freq³ência e em freq³ências pulsantes entre os modos de polarização x, y ortogonais e lineares ou modos espaciais LP~ 01~ e LP~ 11~^ reto^. As freq³ências pulsantes podem ser medidas de forma simples com um contador de freq³ência (19). Variações de duplo fracionamento condicionadas pela temperatura são compensadas em uma disposição diferencial de dois segmentos de fibras sensoriais (5a, 5b). Como refletores terminais de laser adaptam-se especialmente as Grades Bragg para Fibra (4a, 4b) com reduzidas larguras de banda (0,2 nm). O sensor de pressão (1) destaca-se por uma ampla faixa de medição (100 Mpa) e elevada capacidade de resolução (kPa), sendo possível a multiplexão simples que pode ser integrada em um alojamento pressurizado (25) muito compacto, de peso reduzido e de constituição robusta.
BR9908236-5A 1998-02-25 1999-01-14 Laser de fibra - sensor de pressão BR9908236A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19807891A DE19807891A1 (de) 1998-02-25 1998-02-25 Faserlaser-Drucksensor
PCT/CH1999/000017 WO1999044023A1 (de) 1998-02-25 1999-01-14 Faserlaser-drucksensor

Publications (1)

Publication Number Publication Date
BR9908236A true BR9908236A (pt) 2000-10-31

Family

ID=7858854

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9908236-5A BR9908236A (pt) 1998-02-25 1999-01-14 Laser de fibra - sensor de pressão

Country Status (7)

Country Link
US (1) US6630658B1 (pt)
EP (1) EP1060372B1 (pt)
AU (1) AU1746999A (pt)
BR (1) BR9908236A (pt)
DE (2) DE19807891A1 (pt)
NO (1) NO20003406L (pt)
WO (1) WO1999044023A1 (pt)

Families Citing this family (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1541984A3 (en) * 1998-12-17 2006-06-07 Chevron USA, Inc. Apparatus for communicating and measuring pressure
US6766703B1 (en) 1999-02-05 2004-07-27 Sensor Dynamics Limited Apparatus and method for enhancing remote sensor performance and utility
US6246048B1 (en) 1999-05-18 2001-06-12 Schlumberger Technology Corporation Methods and apparatus for mechanically enhancing the sensitivity of longitudinally loaded fiber optic sensors
GB2360584B (en) * 2000-03-25 2004-05-19 Abb Offshore Systems Ltd Monitoring fluid flow through a filter
DE10024588A1 (de) * 2000-05-19 2001-11-22 Endress Hauser Gmbh Co Vorrichtung zur Bestimmung bzw. zur Überwachung des Drucks oder Differenzdrucks zumindest eines Prozeßmediums
FR2811148B1 (fr) * 2000-06-30 2006-07-21 Thomson Csf Laser pompe et milieu laser optimise
DE10049951A1 (de) * 2000-10-06 2002-04-18 Siemens Ag Faseroptischer Sensor zur Bestimmung eines Analyten mit hoch doppelbrechendem Lichtwellenleiter sowie Verwendung des faseroptischen Sensors
GB2367890B (en) * 2000-10-06 2004-06-23 Abb Offshore Systems Ltd Sensing strain in hydrocarbon wells
EP1197738A1 (de) 2000-10-18 2002-04-17 Abb Research Ltd. Anisotroper Faserlaser-Sensor mit verteilter Rückkopplung
JP3360074B2 (ja) * 2001-03-08 2002-12-24 科学技術振興事業団 可変光波機能回路及び可変光波機能装置
EP1310801A1 (de) * 2001-11-13 2003-05-14 Abb Research Ltd. Seismischer Faserlaser-Sensor
EP1359394A1 (de) * 2002-04-30 2003-11-05 Abb Research Ltd. Hochauflösender Faserlaser-Sensor
GB0214293D0 (en) * 2002-06-21 2002-07-31 Qinetiq Ltd Optical sensing apparatus
AU2002327293A1 (en) * 2002-07-23 2004-02-09 Halliburton Energy Services, Inc. Subterranean well pressure and temperature measurement
GB2414543B (en) * 2004-05-25 2009-06-03 Polarmetrix Ltd Method and apparatus for detecting pressure distribution in fluids
US7159468B2 (en) * 2004-06-15 2007-01-09 Halliburton Energy Services, Inc. Fiber optic differential pressure sensor
US7271884B2 (en) * 2004-08-06 2007-09-18 The United States Of America Represented By The Secretary Of The Navy Natural fiber span reflectometer providing a virtual phase signal sensing array capability
US7274441B2 (en) * 2004-08-06 2007-09-25 The United States Of America Represented By The Secretary Of The Navy Natural fiber span reflectometer providing a virtual differential signal sensing array capability
US7268863B2 (en) * 2004-08-06 2007-09-11 The United States Of America As Represented By The Secretary Of The Navy Natural fiber span reflectometer providing a spread spectrum virtual sensing array capability
GB0424305D0 (en) * 2004-11-03 2004-12-01 Polarmetrix Ltd Phase-disturbance location and measurement in optical-fibre interferometric reflectometry
US7206259B2 (en) * 2004-12-15 2007-04-17 The Hong Kong Polytechnic University Ultrasound sensor and ultrasound measurement device
US7397976B2 (en) * 2005-01-25 2008-07-08 Vetco Gray Controls Limited Fiber optic sensor and sensing system for hydrocarbon flow
GB2427910B (en) * 2005-07-02 2008-03-12 Sensor Highway Ltd Fiber optic temperature and pressure sensor and system incorporating same
US7561776B2 (en) * 2005-11-29 2009-07-14 Petrospec Engineering Ltd. Method of preventing hydrogen darkening of optic fibre
US7800755B1 (en) * 2007-07-02 2010-09-21 The United States Of America As Represented By The Secretary Of The Navy High-speed polarimeter having a multi-wavelength source
FR2929000B1 (fr) * 2008-03-18 2010-04-09 Thales Sa Capteur a fibre optique auto-reference et reseau de capteurs associe
US8672539B2 (en) 2008-06-12 2014-03-18 Halliburton Energy Services, Inc. Multiple sensor fiber optic sensing system
FR2934365B1 (fr) * 2008-07-25 2010-08-13 Thales Sa Capteur a fibre optique auto-reference a diffusion brillouin stimulee
CA2791241C (en) 2009-04-22 2018-06-19 Lxdata Inc. Pressure sensor arrangement using an optical fiber and methodologies for performing an analysis of a subterranean formation
CN101655404B (zh) * 2009-09-17 2012-11-07 上海华魏光纤传感技术有限公司 一种光学液压检测装置及方法
US20110133067A1 (en) * 2009-12-08 2011-06-09 Schlumberger Technology Corporation Optical sensor having a capillary tube and an optical fiber in the capillary tube
US8793102B2 (en) * 2010-01-12 2014-07-29 Baker Hughes Incorporated Multi-gap interferometric sensors
US8558994B2 (en) * 2010-01-12 2013-10-15 Baker Hughes Incorporated EFPI sensor
DE102010019247A1 (de) * 2010-05-03 2011-11-03 Deutsches Zentrum für Luft- und Raumfahrt e.V. Sensor, System sowie Verfahren zur Kraft- und/oder Momentenmessung
GB201019117D0 (en) 2010-11-11 2010-12-29 Fotech Solutions Ltd Distributed optical fibre sensor
CN103392136B (zh) * 2010-12-02 2018-02-02 Ofs飞泰尔公司 Dfb光纤激光弯曲传感器和光外差麦克风
US9417103B2 (en) 2011-09-20 2016-08-16 Schlumberger Technology Corporation Multiple spectrum channel, multiple sensor fiber optic monitoring system
US9116304B2 (en) * 2012-04-16 2015-08-25 The United States Of America, As Represented By The Secretary Of The Navy Fiber optic cantilever acoustic vector sensor
CN102778324B (zh) * 2012-07-12 2014-12-03 暨南大学 基于正交双偏振光纤激光器的液压传感器
US9459363B2 (en) 2012-12-06 2016-10-04 Pgs Geophysical As Method and system of performing geophysical surveys with autonomous underwater vehicles
US9575209B2 (en) 2012-12-22 2017-02-21 Halliburton Energy Services, Inc. Remote sensing methods and systems using nonlinear light conversion and sense signal transformation
US9091785B2 (en) 2013-01-08 2015-07-28 Halliburton Energy Services, Inc. Fiberoptic systems and methods for formation monitoring
US10241229B2 (en) 2013-02-01 2019-03-26 Halliburton Energy Services, Inc. Distributed feedback fiber laser strain sensor systems and methods for subsurface EM field monitoring
TW201508249A (zh) * 2013-06-12 2015-03-01 Optics Balzers Ag 一體型光波導感測器系統
WO2015023255A1 (en) 2013-08-12 2015-02-19 Halliburton Energy Services, Inc Systems and methods for spread spectrum distributed acoustic sensor monitoring
FR3014200B1 (fr) * 2013-12-02 2017-05-26 Commissariat Energie Atomique Controle de structure industrielle
WO2016033199A1 (en) 2014-08-28 2016-03-03 Adelos, Inc. Real-time fiber optic interferometry controller
WO2016085511A1 (en) 2014-11-26 2016-06-02 Halliburton Energy Services, Inc. Onshore electromagnetic reservoir monitoring
CN104568252B (zh) * 2015-01-07 2017-02-01 天津大学 基于偏振外差光纤激光传感器的压力方向性检测方法
US9651706B2 (en) 2015-05-14 2017-05-16 Halliburton Energy Services, Inc. Fiberoptic tuned-induction sensors for downhole use
US10711602B2 (en) 2015-07-22 2020-07-14 Halliburton Energy Services, Inc. Electromagnetic monitoring with formation-matched resonant induction sensors
US10495610B2 (en) * 2017-08-14 2019-12-03 Geoffrey A. Cranch Fiber optic acoustic emission sensor and apparatus
GB2568524B (en) * 2017-11-20 2019-11-06 Smart Fibres Ltd A method for forming a pressure sensor
DE102018105703A1 (de) 2018-03-13 2019-09-19 Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum - GFZ Stiftung des Öffentlichen Rechts des Landes Brandenburg Verfahren und System zur Überwachung eines Materials und/oder einer Vorrichtung in einem Bohrloch unter Verwendung eines faseroptischen Messkabels
WO2020170047A1 (en) * 2019-02-22 2020-08-27 National Research Council Of Canada Apparatus, method and system for detecting presence of a fluid
GB2582770B (en) * 2019-04-01 2021-10-06 Halliburton Energy Services Inc A method for forming a pressure sensor
US10935720B2 (en) * 2019-04-29 2021-03-02 Ii-Vi Delaware, Inc. Laser beam product parameter adjustments
CN113063451A (zh) * 2019-12-16 2021-07-02 中兴通讯股份有限公司 一种接收模块及布里渊光时域分析仪
DE102022116877A1 (de) 2022-07-06 2024-01-11 Technische Universität Dresden, Körperschaft des öffentlichen Rechts Optoelektronischer drucksensor
CN115219025B (zh) * 2022-07-18 2023-06-02 济南大学 基于双芯光纤制成的光压测定装置和方法
CN115219024B (zh) * 2022-07-18 2023-06-20 济南大学 一种基于光纤盘式差分测量原理的光压测定装置和方法
CN115235622B (zh) * 2022-07-18 2023-06-02 济南大学 一种基于双芯光纤的摆式光压测定装置和方法
CN115219023B (zh) * 2022-07-18 2023-05-30 济南大学 一种基于双芯光纤干涉仪的摆式光压测定装置和方法

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2104752B (en) * 1981-07-20 1986-02-19 Chevron Res Optical communication system for drill hole logging
CA1211506A (en) * 1983-02-22 1986-09-16 Sundstrand Data Control, Inc. Borehole inertial guidance system
US4542647A (en) * 1983-02-22 1985-09-24 Sundstrand Data Control, Inc. Borehole inertial guidance system
US4929050A (en) * 1988-10-31 1990-05-29 Unisys Corporation Traveling wave fiber optic interferometric sensor and method of polarization poling fiber optic
US5144690A (en) * 1990-12-03 1992-09-01 Corning Incorporated Optical fiber sensor with localized sensing regions
US5208877A (en) * 1991-08-29 1993-05-04 Center For Innovative Technology Fiber optic grating-based weighted, two-mode fiber sensors
FR2683053B1 (fr) * 1991-10-29 1994-10-07 Thomson Csf Fibre optique et procede de fabrication.
GB9203471D0 (en) * 1992-02-19 1992-04-08 Sensor Dynamics Ltd Optical fibre pressure sensor
US5434876A (en) * 1992-10-23 1995-07-18 At&T Bell Laboratories Article comprising an optical waveguide laser
US5513913A (en) * 1993-01-29 1996-05-07 United Technologies Corporation Active multipoint fiber laser sensor
DE4322291C2 (de) * 1993-07-05 1999-10-14 Wolfgang Holzapfel Optische Kraftmeßeinrichtung
FR2720198B1 (fr) * 1994-05-20 1996-07-19 France Telecom Laser à fibre optique polarisé linéairement.
US5493113A (en) * 1994-11-29 1996-02-20 United Technologies Corporation Highly sensitive optical fiber cavity coating removal detection
US5546481A (en) * 1995-03-02 1996-08-13 United Technologies Corporation Single polarization fiber and amplifier
US5591965A (en) * 1995-05-08 1997-01-07 Udd; Eric Multiparameter sensor system using a multiple grating fiber optic birefringent fiber
US5841131A (en) * 1997-07-07 1998-11-24 Schlumberger Technology Corporation Fiber optic pressure transducers and pressure sensing system incorporating same

Also Published As

Publication number Publication date
NO20003406L (no) 2000-08-22
DE19807891A1 (de) 1999-08-26
NO20003406D0 (no) 2000-06-29
EP1060372B1 (de) 2003-10-15
DE59907371D1 (de) 2003-11-20
AU1746999A (en) 1999-09-15
EP1060372A1 (de) 2000-12-20
WO1999044023A1 (de) 1999-09-02
US6630658B1 (en) 2003-10-07

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Legal Events

Date Code Title Description
FA10 Dismissal: dismissal - article 33 of industrial property law
B11Y Definitive dismissal - extension of time limit for request of examination expired [chapter 11.1.1 patent gazette]
B15K Others concerning applications: alteration of classification

Ipc: G02B 6/02 (2006.01), G01D 5/353 (2006.0