CA2437031A1 - Oxygen concentrating apparatus - Google Patents
Oxygen concentrating apparatus Download PDFInfo
- Publication number
- CA2437031A1 CA2437031A1 CA002437031A CA2437031A CA2437031A1 CA 2437031 A1 CA2437031 A1 CA 2437031A1 CA 002437031 A CA002437031 A CA 002437031A CA 2437031 A CA2437031 A CA 2437031A CA 2437031 A1 CA2437031 A1 CA 2437031A1
- Authority
- CA
- Canada
- Prior art keywords
- ultrasonic
- oxygen
- gas
- reception device
- conduit
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/02—Preparation of oxygen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/02—Preparation of oxygen
- C01B13/0229—Purification or separation processes
- C01B13/0248—Physical processing only
- C01B13/0259—Physical processing only by adsorption on solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
- A61M16/101—Preparation of respiratory gases or vapours with O2 features or with parameter measurement using an oxygen concentrator
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/105—Filters
- A61M16/106—Filters in a path
- A61M16/107—Filters in a path in the inspiratory path
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
- A61M2016/102—Measuring a parameter of the content of the delivered gas
- A61M2016/1025—Measuring a parameter of the content of the delivered gas the O2 concentration
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0043—Impurity removed
- C01B2210/0046—Nitrogen
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
An apparatus 150, for generating an oxygen enhanced gas by removing nitrogen gas from air, includes a compressor 156 absorption columns 152a and 152b for removing the nitrogen gas from the pressurized air supplied from the compressor 156, a flow rate measuring device 168 provided downstream of the absorption columns 152a and 152b, ultrasonic oxygen concentration measuring means 170 provided downstream of the flow rate measuring device 168. The ultrasonic oxygen concentration measuring means 170 includes means for generating a correction coefficient for the ratio between oxygen and argon gases contained in the oxygen enhanced gas on the basis of the flow rate of the oxygen enhanced gas measured.
Claims (6)
1. An apparatus for generating an oxygen enhanced gas by removing nitrogen gas from air, comprising:
a pressurized air source;
an absorption column for removing the nitrogen gas from the pressurized air supplied from the pressurized air source;
a flow rate measuring device provided downstream of the absorption column;
ultrasonic oxygen concentration measuring means provided downstream of the flow rate measuring device; and the ultrasonic oxygen concentration measuring means comprises means for generating a correction coefficient for the ratio between oxygen and argon gases contained in the oxygen enhanced gas on the basis of the flow rate of the oxygen enhanced gas measured by the flow rate measuring device.
a pressurized air source;
an absorption column for removing the nitrogen gas from the pressurized air supplied from the pressurized air source;
a flow rate measuring device provided downstream of the absorption column;
ultrasonic oxygen concentration measuring means provided downstream of the flow rate measuring device; and the ultrasonic oxygen concentration measuring means comprises means for generating a correction coefficient for the ratio between oxygen and argon gases contained in the oxygen enhanced gas on the basis of the flow rate of the oxygen enhanced gas measured by the flow rate measuring device.
2. An apparatus according to claim 1, wherein the ultrasonic oxygen concentration measuring means comprises:
a conduit for flowing an objective gas the concentration of which is measured;
a ultrasonic transmission-reception device secured inside of the conduit;
a reflector secured inside of the conduit to face the ultrasonic transmission-reception device;
a transmission-reception switch for switching the operation mode of the ultrasonic transmission-reception device between a transmission mode in which the ultrasonic transmission-reception device transmits ultrasonic waves and a reception mode in which the ultrasonic transmission-reception device receives the ultrasonic waves;
a temperature sensor, disposed inside of the conduit, for measuring the temperature of the calibration gas flowing through the conduit;
propagation time calculating means for calculating the propagation time of ultrasonic waves through the calibration gas within the conduit on the basis of the time when the ultrasonic waves are transmitted by the ultrasonic transmission-reception device and the time when the ultrasonic waves reflected by the reflector are received by the ultrasonic transmission-reception device; and means for generating a correction coefficient for the ratio between oxygen and argon gases contained in the oxygen enhanced gas on the basis of the flow rate of the oxygen enhanced gas measured by the flow rate measuring device whereby the oxygen concentration of the oxygen enhanced gas is corrected on the basis of the correction coefficient generated by the correction coefficient generating means.
a conduit for flowing an objective gas the concentration of which is measured;
a ultrasonic transmission-reception device secured inside of the conduit;
a reflector secured inside of the conduit to face the ultrasonic transmission-reception device;
a transmission-reception switch for switching the operation mode of the ultrasonic transmission-reception device between a transmission mode in which the ultrasonic transmission-reception device transmits ultrasonic waves and a reception mode in which the ultrasonic transmission-reception device receives the ultrasonic waves;
a temperature sensor, disposed inside of the conduit, for measuring the temperature of the calibration gas flowing through the conduit;
propagation time calculating means for calculating the propagation time of ultrasonic waves through the calibration gas within the conduit on the basis of the time when the ultrasonic waves are transmitted by the ultrasonic transmission-reception device and the time when the ultrasonic waves reflected by the reflector are received by the ultrasonic transmission-reception device; and means for generating a correction coefficient for the ratio between oxygen and argon gases contained in the oxygen enhanced gas on the basis of the flow rate of the oxygen enhanced gas measured by the flow rate measuring device whereby the oxygen concentration of the oxygen enhanced gas is corrected on the basis of the correction coefficient generated by the correction coefficient generating means.
3. An apparatus according to claim 2, wherein the ultrasonic oxygen concentration measuring means comprises a calibration gas source for supplying the calibration gas the component and the component ratio of which is known; and means for calibrating the reference length between the ultrasonic transmission-reception device and the reflector on the basis of the calculation results by the propagation time calculating means when the calibration gas flows through the conduit from the calibration gas source.
4. An apparatus for generating an oxygen enhanced gas by removing nitrogen gas from air, comprising:
a pressurized air source;
an absorption column for removing the nitrogen gas from the pressurized air supplied from the pressurized air source;
ultrasonic oxygen concentration and flow rate measuring means provided downstream of the flow rate measuring device; and the ultrasonic oxygen concentration and flow rate measuring means comprises means for generating a correction coefficient for the ratio between oxygen and argon gases contained in the oxygen enhanced gas on the basis of the flow rate of the oxygen enhanced gas measured by the flow rate measuring device.
a pressurized air source;
an absorption column for removing the nitrogen gas from the pressurized air supplied from the pressurized air source;
ultrasonic oxygen concentration and flow rate measuring means provided downstream of the flow rate measuring device; and the ultrasonic oxygen concentration and flow rate measuring means comprises means for generating a correction coefficient for the ratio between oxygen and argon gases contained in the oxygen enhanced gas on the basis of the flow rate of the oxygen enhanced gas measured by the flow rate measuring device.
5. An apparatus according to claim 4, wherein the ultrasonic oxygen concentration measuring means comprises:
a conduit for flowing an objective gas the concentration of which is measured;
a first ultrasonic transmission-reception device secured inside of the conduit;
a second ultrasonic transmission-reception device secured inside of the conduit to face the first ultrasonic transmission-reception device;
a transmission-reception switch for switching the operation mode of each of the first and second ultrasonic transmission-reception devices between a transmission mode in which the ultrasonic transmission-reception device transmits ultrasonic waves and a reception mode in which the ultrasonic transmission-reception device receives the ultrasonic waves;
a temperature sensor, disposed inside of the conduit, for measuring the temperature of the calibration gas flowing through the conduit; and propagation time calculating means for calculating first propagation time of ultrasonic waves through the calibration gas within the conduit on the basis of the time when the ultrasonic waves are transmitted by the first ultrasonic transmission-reception device and the time when the ultrasonic waves are received by the second ultrasonic transmission-reception device, and for calculating second propagation time of ultrasonic waves through the calibration gas within the conduit on the basis of the time when the ultrasonic waves are transmitted by the second ultrasonic transmission-reception device and the time when the ultrasonic waves are received by the first ultrasonic transmission-reception device.
a conduit for flowing an objective gas the concentration of which is measured;
a first ultrasonic transmission-reception device secured inside of the conduit;
a second ultrasonic transmission-reception device secured inside of the conduit to face the first ultrasonic transmission-reception device;
a transmission-reception switch for switching the operation mode of each of the first and second ultrasonic transmission-reception devices between a transmission mode in which the ultrasonic transmission-reception device transmits ultrasonic waves and a reception mode in which the ultrasonic transmission-reception device receives the ultrasonic waves;
a temperature sensor, disposed inside of the conduit, for measuring the temperature of the calibration gas flowing through the conduit; and propagation time calculating means for calculating first propagation time of ultrasonic waves through the calibration gas within the conduit on the basis of the time when the ultrasonic waves are transmitted by the first ultrasonic transmission-reception device and the time when the ultrasonic waves are received by the second ultrasonic transmission-reception device, and for calculating second propagation time of ultrasonic waves through the calibration gas within the conduit on the basis of the time when the ultrasonic waves are transmitted by the second ultrasonic transmission-reception device and the time when the ultrasonic waves are received by the first ultrasonic transmission-reception device.
6. An apparatus according to claim 5, wherein the ultrasonic oxygen concentration measuring means comprises a calibration gas source for supplying the calibration gas the component and the component ratio of which is known;
means for calibrating the reference length between the ultrasonic transmission-reception device and the reflector on the basis of the calculation results by the propagation time calculating means when the calibration gas flows through the conduit from the calibration gas source; and means for generating a correction coefficient for the ratio between oxygen and argon gases contained in the oxygen enhanced gas on the basis of the flow rate of the oxygen enhanced gas whereby the oxygen concentration of the oxygen enhanced gas is corrected on the basis of the correction coefficient generated by the correction coefficient generating means.
means for calibrating the reference length between the ultrasonic transmission-reception device and the reflector on the basis of the calculation results by the propagation time calculating means when the calibration gas flows through the conduit from the calibration gas source; and means for generating a correction coefficient for the ratio between oxygen and argon gases contained in the oxygen enhanced gas on the basis of the flow rate of the oxygen enhanced gas whereby the oxygen concentration of the oxygen enhanced gas is corrected on the basis of the correction coefficient generated by the correction coefficient generating means.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001332329A JP4180815B2 (en) | 2001-10-30 | 2001-10-30 | Medical oxygen concentrator |
| JP2001/332329 | 2001-10-30 | ||
| JP2001/340367 | 2001-11-06 | ||
| JP2001340367A JP3979821B2 (en) | 2001-11-06 | 2001-11-06 | Medical oxygen concentrator |
| PCT/JP2002/011238 WO2003037786A1 (en) | 2001-10-30 | 2002-10-29 | Oxygen enriching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2437031A1 true CA2437031A1 (en) | 2003-05-08 |
| CA2437031C CA2437031C (en) | 2010-04-13 |
Family
ID=26624200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2437031A Expired - Lifetime CA2437031C (en) | 2001-10-30 | 2002-10-29 | Oxygen concentrating apparatus |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US6960246B2 (en) |
| EP (1) | EP1440935B1 (en) |
| KR (1) | KR100908583B1 (en) |
| CN (1) | CN1223510C (en) |
| AT (1) | ATE438587T1 (en) |
| AU (1) | AU2002363201B2 (en) |
| CA (1) | CA2437031C (en) |
| DE (1) | DE60233245D1 (en) |
| ES (1) | ES2328911T3 (en) |
| HK (1) | HK1065023A1 (en) |
| PT (1) | PT1440935E (en) |
| TW (1) | TWI259090B (en) |
| WO (1) | WO2003037786A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3002025A1 (en) * | 2003-08-26 | 2016-04-06 | Teijin Pharma Limited | Oxygen concentration apparatus |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2841153B1 (en) * | 2002-06-21 | 2004-07-23 | Air Liquide | METHOD FOR REGULATING A TREATMENT UNIT, BY PRESSURE MODULATED ADSORPTION, OF AT LEAST ONE CHARGE GAS |
| JP2004036488A (en) * | 2002-07-03 | 2004-02-05 | Honda Motor Co Ltd | State determining device for hydrocarbon adsorbent |
| DE10323137B4 (en) * | 2003-05-22 | 2008-04-30 | DRäGER AEROSPACE GMBH | Apparatus for enriching air with oxygen in an aircraft and a method for operating the apparatus |
| WO2009063938A1 (en) * | 2007-11-15 | 2009-05-22 | Teijin Pharma Limited | Oxygen concentrator |
| KR101756492B1 (en) * | 2009-11-02 | 2017-07-10 | 데이진 화-마 가부시키가이샤 | Oxygen enrichment device |
| JP2012200387A (en) * | 2011-03-25 | 2012-10-22 | Fujikura Rubber Ltd | Oxygen tank unit for oxygen concentrator |
| US10029064B2 (en) * | 2012-03-27 | 2018-07-24 | Teijin Pharma Limited | Sound muffler and oxygen concentration device comprising the same |
| WO2017106644A1 (en) * | 2015-12-18 | 2017-06-22 | Inova Labs, Inc. | Vortex canisters for oxvgen-nitrogen separation particles |
| JP6832152B2 (en) | 2016-12-21 | 2021-02-24 | 上田日本無線株式会社 | Gas concentration measuring device and its calibration method |
| WO2019119054A1 (en) * | 2017-12-21 | 2019-06-27 | ResMed Pty Ltd | Methods and apparatus for treating a respiratory disorder |
| CN111060589A (en) * | 2020-01-10 | 2020-04-24 | 湖北锐意自控系统有限公司 | System and method for measuring concentration of anesthetic gas |
| CN113063467A (en) * | 2021-04-28 | 2021-07-02 | 哈勃智能传感(深圳)有限公司 | Sensor-based oxygen concentration and effective flow measuring method and storage medium |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4627860A (en) * | 1982-07-09 | 1986-12-09 | Hudson Oxygen Therapy Sales Company | Oxygen concentrator and test apparatus |
| GB8503559D0 (en) * | 1984-04-06 | 1985-03-13 | Bailey H S | Swimming pool enclosures molecular sieve type gas separation systems |
| JPS61131756A (en) * | 1984-11-30 | 1986-06-19 | 鳥取大学長 | Respiration tuning air sending type concentrated oxygen supply apparatus |
| GB8623605D0 (en) * | 1986-10-01 | 1986-11-05 | Normalair Garrett Ltd | Aircraft on-board gas generating apparatus |
| US5071453A (en) * | 1989-09-28 | 1991-12-10 | Litton Systems, Inc. | Oxygen concentrator with pressure booster and oxygen concentration monitoring |
| US5060506A (en) * | 1989-10-23 | 1991-10-29 | Douglas David W | Method and apparatus for monitoring the content of binary gas mixtures |
| US5060514A (en) * | 1989-11-30 | 1991-10-29 | Puritan-Bennett Corporate | Ultrasonic gas measuring device |
| US5247826B1 (en) * | 1992-11-12 | 1995-07-18 | Devilbiss Health Care Inc | Gas concentration and/or flow sensor |
| US5593478A (en) * | 1994-09-28 | 1997-01-14 | Sequal Technologies, Inc. | Fluid fractionator |
| US5531807A (en) * | 1994-11-30 | 1996-07-02 | Airsep Corporation | Apparatus and method for supplying oxygen to passengers on board aircraft |
| US5529607A (en) * | 1995-03-15 | 1996-06-25 | The Boc Group, Inc. | PSA process with dynamic purge control |
| US5627323A (en) * | 1995-05-25 | 1997-05-06 | Stern; Michael | Ultrasonic binary gas measuring device |
| US6063169A (en) * | 1996-05-10 | 2000-05-16 | Litton Systems, Inc. | Control means for molecular sieve on-board oxygen generator |
| US5917135A (en) * | 1996-06-14 | 1999-06-29 | Invacare Corporation | Gas concentration sensor and control for oxygen concentrator utilizing gas concentration sensor |
| US5906672A (en) * | 1996-06-14 | 1999-05-25 | Invacare Corporation | Closed-loop feedback control for oxygen concentrator |
| US5746806A (en) * | 1996-08-15 | 1998-05-05 | Nellcor Puritan Bennett Incorporated | Apparatus and method for controlling output of an oxygen concentrator |
| US5858062A (en) * | 1997-02-10 | 1999-01-12 | Litton Systems, Inc. | Oxygen concentrator |
| US6395065B1 (en) * | 1999-05-14 | 2002-05-28 | Respironics, Inc. | Air flow control in a gas fractionalization system and associated method |
| US6342090B1 (en) * | 2000-05-16 | 2002-01-29 | Litton Systems, Inc. | Gas generating system with multi-rate charging feature |
| CA2403862C (en) | 2001-01-22 | 2010-06-29 | Teijin Limited | Ultrasonic apparatus and method for measuring the concentration and flow rate of gas |
| JP4536939B2 (en) | 2001-01-22 | 2010-09-01 | 帝人株式会社 | Ultrasonic reflection type gas concentration measuring method and apparatus |
| JP4169483B2 (en) | 2001-01-22 | 2008-10-22 | 帝人株式会社 | Ultrasonic gas concentration flow measurement method and apparatus |
| US6712876B2 (en) * | 2002-08-27 | 2004-03-30 | Litton Systems, Inc. | Oxygen concentrator system with altitude compensation |
-
2002
- 2002-10-29 AU AU2002363201A patent/AU2002363201B2/en not_active Expired
- 2002-10-29 EP EP02802381A patent/EP1440935B1/en not_active Expired - Lifetime
- 2002-10-29 US US10/466,612 patent/US6960246B2/en not_active Expired - Lifetime
- 2002-10-29 ES ES02802381T patent/ES2328911T3/en not_active Expired - Lifetime
- 2002-10-29 KR KR1020037008899A patent/KR100908583B1/en active IP Right Grant
- 2002-10-29 CN CNB028042646A patent/CN1223510C/en not_active Expired - Lifetime
- 2002-10-29 WO PCT/JP2002/011238 patent/WO2003037786A1/en active IP Right Grant
- 2002-10-29 AT AT02802381T patent/ATE438587T1/en not_active IP Right Cessation
- 2002-10-29 CA CA2437031A patent/CA2437031C/en not_active Expired - Lifetime
- 2002-10-29 DE DE60233245T patent/DE60233245D1/en not_active Expired - Lifetime
- 2002-10-29 PT PT02802381T patent/PT1440935E/en unknown
- 2002-10-30 TW TW091132184A patent/TWI259090B/en not_active IP Right Cessation
-
2004
- 2004-10-14 HK HK04107946A patent/HK1065023A1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3002025A1 (en) * | 2003-08-26 | 2016-04-06 | Teijin Pharma Limited | Oxygen concentration apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1440935A4 (en) | 2006-02-01 |
| CN1223510C (en) | 2005-10-19 |
| TW200300096A (en) | 2003-05-16 |
| EP1440935B1 (en) | 2009-08-05 |
| KR100908583B1 (en) | 2009-07-22 |
| EP1440935A1 (en) | 2004-07-28 |
| DE60233245D1 (en) | 2009-09-17 |
| CA2437031C (en) | 2010-04-13 |
| US20040060445A1 (en) | 2004-04-01 |
| PT1440935E (en) | 2009-08-24 |
| AU2002363201B2 (en) | 2007-03-22 |
| HK1065023A1 (en) | 2005-02-08 |
| TWI259090B (en) | 2006-08-01 |
| KR20040047740A (en) | 2004-06-05 |
| ATE438587T1 (en) | 2009-08-15 |
| US6960246B2 (en) | 2005-11-01 |
| CN1489551A (en) | 2004-04-14 |
| ES2328911T3 (en) | 2009-11-19 |
| WO2003037786A1 (en) | 2003-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2403862A1 (en) | Ultrasonic apparatus and method for measuring the concentration and flow rate of gas | |
| CA2437031A1 (en) | Oxygen concentrating apparatus | |
| CA2776083C (en) | Ultrasonic apparatus and method for measuring the concentration and flow rate of gas | |
| CN101680859B (en) | Ultrasonic gas concentration measuring method and device using the same | |
| CN101084415A (en) | Ultrasonic flowmeter having a pressure sensor | |
| AU2001258145A1 (en) | Gas meter | |
| MXPA04010827A (en) | Monitoring medical gas xenon concentration using ultrasonic gas analyser. | |
| SE0200184D0 (en) | Acoustic Gas Meter | |
| JP2002306603A (en) | Oxygen concentrator | |
| JP3979821B2 (en) | Medical oxygen concentrator | |
| JP4180815B2 (en) | Medical oxygen concentrator | |
| KR20040004103A (en) | Gas protective device and gas protective method | |
| JPH05126738A (en) | Density measurement method for powder and its device | |
| JP2005074061A (en) | Gas supply device | |
| JP2000162004A (en) | Ultrasonic flowmeter | |
| JPH08145740A (en) | Flow measuring instrument for semiconductor manufacturing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20221031 |