| Patent | 
	  	 Priority | 
	  	 Assignee | 
	  	 Title | 
	  
	      
	 | 3768468,  | 
	  | 
	  | 
	  | 
	 
    
	 | 4302224,  | 
	 Oct 12 1979 | 
	 JOHN BUNN COMPANY, THE | 
	 Compact oxygen concentrator | 
	 
    
	 | 4331455,  | 
	 May 11 1979 | 
	 Osaka Oxygen Industries, Ltd. | 
	 Method of producing oxygen rich gas utilizing an oxygen concentrator having good start-up characteristics | 
	 
    
	 | 4342573,  | 
	 Oct 12 1979 | 
	 JOHN BUNN COMPANY, THE | 
	 Compact oxygen concentrator | 
	 
    
	 | 4519387,  | 
	 Dec 03 1982 | 
	 Sunrise Medical HHG Inc | 
	 Respirating gas supply method and apparatus therefor | 
	 
    
	 | 4612928,  | 
	 Aug 28 1984 | 
	  | 
	 Method and apparatus for supplying a gas to a body | 
	 
    
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	 Jun 17 1985 | 
	 TELEDYNE MONITOR LABS, INC  | 
	 Method and apparatus for ultrasonic measurements of a medium | 
	 
    
	 | 4681099,  | 
	 Nov 30 1984 | 
	 Respironics, Inc | 
	 Breath-synchronized concentrated-oxygen supplier | 
	 
    
	 | 4813979,  | 
	 Feb 02 1988 | 
	 UNITED STATES OF AMERICA, THE, AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE | 
	 Secondary oxygen purifier for molecular sieve oxygen concentrator | 
	 
    
	 | 4857086,  | 
	 Oct 17 1987 | 
	 Hitachi Ltd | 
	 Gas separator system | 
	 
    
	 | 4859217,  | 
	 Jun 30 1987 | 
	 UOP, DES PLAINES, ILLINOIS A NY GENERAL PARTNERSHIP; KATALISTIKS INTERNATIONAL, INC  | 
	 Process for separating nitrogen from mixtures thereof with less polar substances | 
	 
    
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	 Mar 22 1989 | 
	 AirSep Corporation | 
	 Pressure swing adsorption process and system | 
	 
    
	 | 4925464,  | 
	 Nov 17 1988 | 
	 Teijin Limited | 
	 Fluid flow switching valve assembly and system | 
	 
    
	 | 4938066,  | 
	 Jan 29 1988 | 
	 Xecutek Corporation | 
	 Ultrasonic apparatus for measuring the speed of sound in a gaseous medium | 
	 
    
	 | 4968329,  | 
	 Oct 26 1987 | 
	 QUEST AIR CASES INC  | 
	 Pressure swing adsorption for concentration of a gas component | 
	 
    
	 | 4971609,  | 
	 Feb 05 1990 | 
	  | 
	 Portable oxygen concentrator | 
	 
    
	 | 4973339,  | 
	 Oct 18 1989 | 
	 AirSep Corporation | 
	 Pressure swing absorption process and system for gas separation | 
	 
    
	 | 5004485,  | 
	 Apr 03 1989 | 
	 Normalair-Garrett (Holdings) Ltd. | 
	 Molecular sieve-type gas separation systems | 
	 
    
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	 Jan 12 1987 | 
	  | 
	 Apparatus for inhalation therapy using triggered dose oxygenator employing an optoelectronic inhalation sensor | 
	 
    
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	 Nov 15 1988 | 
	  | 
	 Respiratory gas supply apparatus and method | 
	 
    
	 | 5060506,  | 
	 Oct 23 1989 | 
	 RIC Investments, LLC | 
	 Method and apparatus for monitoring the content of binary gas mixtures | 
	 
    
	 | 5060514,  | 
	 Nov 30 1989 | 
	 PURITAN-BENNETT CORPORATION                                 A CORP  OF DE | 
	 Ultrasonic gas measuring device | 
	 
    
	 | 5099837,  | 
	 Sep 28 1990 | 
	  | 
	 Inhalation-based control of medical gas | 
	 
    
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	 Sep 08 1988 | 
	 Bergwerksverband GmbH | 
	 Process for at least partially separating a gaseous component from a mixture of gaseous components | 
	 
    
	 | 5129924,  | 
	 Dec 29 1989 | 
	  | 
	 Supplemental oxygen ventilator | 
	 
    
	 | 5268021,  | 
	 Nov 20 1989 | 
	 CHART SEQUAL TECHNOLOGIES INC  | 
	 Fluid fractionator | 
	 
    
	 | 5275642,  | 
	 May 17 1989 | 
	  | 
	 Molecular sieve for oxygen concentrator | 
	 
    
	 | 5340381,  | 
	 May 17 1993 | 
	  | 
	 Operating system for dual-sieve oxygen concentrators | 
	 
    
	 | 5351522,  | 
	 Nov 02 1993 | 
	 NELLCOR PURITAN BENNETT INC | 
	 Gas sensor | 
	 
    
	 | 5469372,  | 
	 Aug 29 1994 | 
	 Raymond A., McBrearty | 
	 Oxygen concentrator remote monitoring apparatus | 
	 
    
	 | 5474595,  | 
	 Apr 25 1994 | 
	 CAIRE INC  | 
	 Capacity control system for pressure swing adsorption apparatus and associated method | 
	 
    
	 | 5549720,  | 
	 Dec 19 1994 | 
	 Nellcor Puritan-Bennett Incorporated | 
	 Filter | 
	 
    
	 | 5575282,  | 
	 Feb 22 1991 | 
	 PARI GmbH Spezialisten fur effektive inhalation | 
	 Oxygen distributor with both mouth and nose delivery ports | 
	 
    
	 | 5578115,  | 
	 Jul 24 1995 | 
	 Sunrise Medical HHG Inc | 
	 Molecular sieve container for oxygen concentrator | 
	 
    
	 | 5593478,  | 
	 Sep 28 1994 | 
	 CAIRE INC  | 
	 Fluid fractionator | 
	 
    
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	 Aug 14 1995 | 
	 RELIABLE ENGINEERING SERVICES, INC  | 
	 Multiple mode oxygen delivery system | 
	 
    
	 | 5682877,  | 
	 Dec 30 1991 | 
	  | 
	 System and method for automatically maintaining a blood oxygen saturation level | 
	 
    
	 | 5730778,  | 
	 Sep 28 1994 | 
	 CAIRE INC  | 
	 Fluid fractionator | 
	 
    
	 | 5733359,  | 
	 Jun 19 1996 | 
	 The BOC Group, Inc.; BOC GROUP, INC , THE | 
	 Pressure swing adsorption process turndown control | 
	 
    
	 | 5746806,  | 
	 Aug 15 1996 | 
	 CAIRE, INC  | 
	 Apparatus and method for controlling output of an oxygen concentrator | 
	 
    
	 | 5764534,  | 
	 Oct 13 1994 | 
	 XILINX, Inc. | 
	 Method for providing placement information during design entry | 
	 
    
	 | 5766310,  | 
	 Jul 19 1996 | 
	 CARLETON LIFE SUPPORT SYSTEMS, INC  | 
	 Single stage secondary high purity oxygen concentrator | 
	 
    
	 | 5792665,  | 
	 May 29 1996 | 
	 O2 TECHNOLOGIES, INC ; Salter Labs | 
	 Oxygen sensing method and hand held analyzer therefore | 
	 
    
	 | 5827358,  | 
	 Nov 08 1996 | 
	 Impact MST, Incorporated | 
	 Rapid cycle pressure swing adsorption oxygen concentration method and apparatus | 
	 
    
	 | 5839434,  | 
	 Nov 16 1993 | 
	 Invacare Corporation | 
	 Method and apparatus for dispensing respiratory gases | 
	 
    
	 | 5858062,  | 
	 Feb 10 1997 | 
	 Respironics, Inc | 
	 Oxygen concentrator | 
	 
    
	 | 5858063,  | 
	 Jun 03 1997 | 
	 CARLETON LIFE SUPPORT SYSTEMS, INC  | 
	 Oxygen concentrator with beds' duty cycle control and self-test | 
	 
    
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	 Nov 29 1996 | 
	 AIRMATRIX TECHNOLOGIES, INC  | 
	 Therapeutic gas flow monitoring system | 
	 
    
	 | 5893944,  | 
	 Sep 30 1997 | 
	 CHUNG HO PRECISION CO , LTD  | 
	 Portable PSA oxygen generator | 
	 
    
	 | 5906672,  | 
	 Jun 14 1996 | 
	 Invacare Corporation | 
	 Closed-loop feedback control for oxygen concentrator | 
	 
    
	 | 5917135,  | 
	 Jun 14 1996 | 
	 Invacare Corporation | 
	 Gas concentration sensor and control for oxygen concentrator utilizing gas concentration sensor | 
	 
    
	 | 5928189,  | 
	 Apr 22 1997 | 
	  | 
	 Activity responsive therapeutic delivery system | 
	 
    
	 | 5961694,  | 
	 Jun 09 1997 | 
	 L AIR LIQUIDE, SOCIETE ANONYME, POUR L ETUDE ET L EXPLOITATION DES PROCEDES GEORGES CLAUDE | 
	 Apparatus and process for the separation of gas mixtures by pressure swing adsorption | 
	 
    
	 | 5968236,  | 
	 Feb 20 1998 | 
	  | 
	 Valve free oxygen concentrator | 
	 
    
	 | 5988465,  | 
	 Jul 01 1997 | 
	  | 
	 Backpack assembly and method of use | 
	 
    
	 | 6065473,  | 
	 Jun 16 1997 | 
	 CAIRE INC  | 
	 Non-contact gas dispenser and apparatus for use therewith | 
	 
    
	 | 6068680,  | 
	 Nov 08 1996 | 
	 Impact MST, Incorporated | 
	 Rapid cycle pressure swing adsorption oxygen concentration method and apparatus | 
	 
    
	 | 6186142,  | 
	 Jul 25 1997 | 
	 MINNESOTA INNOVATIVE TECHNOLOGIES & INSTRUMENTS CORPORATION  MITI  | 
	 Control of respiratory oxygen delivery | 
	 
    
	 | 6186477,  | 
	 May 05 1999 | 
	 CAIRE INC  | 
	 Gas by-pass valve | 
	 
    
	 | 6192883,  | 
	 Aug 03 1999 | 
	  | 
	 Oxygen flow control system and method | 
	 
    
	 | 6220244,  | 
	 Sep 15 1998 | 
	  | 
	 Conserving device for use in oxygen delivery and therapy | 
	 
    
	 | 6238458,  | 
	 Sep 25 1998 | 
	 L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes | 
	 Process for treatment of a gaseous mixture by pressure swing adsorption, with variable production flow rate | 
	 
    
	 | 6253767,  | 
	 Dec 10 1998 | 
	  | 
	 Gas concentrator | 
	 
    
	 | 6302107,  | 
	 Oct 01 1997 | 
	 Invacare Corporation | 
	 Apparatus and method for forming oxygen-enriched gas and compression thereof for high-pressure mobile storage utilization | 
	 
    
	 | 6314957,  | 
	 Apr 13 1999 | 
	 AIR LIQUIDE SANTE  INTERNATIONAL  | 
	 Portable home oxygen therapy medical equipment | 
	 
    
	 | 6371114,  | 
	 Jul 24 1998 | 
	 Minnesota Innovative Technologies & Instruments Corporation | 
	 Control device for supplying supplemental respiratory oxygen | 
	 
    
	 | 6394089,  | 
	 Jan 18 2000 | 
	 COBHAM MISSION SYSTEMS DAVENPORT LSS INC  | 
	 Patient ventilator oxygen concentration system | 
	 
    
	 | 6427690,  | 
	 Oct 21 1998 | 
	 CAIRE INC  | 
	 Combined oxygen regulator and conservation device | 
	 
    
	 | 6446630,  | 
	 Feb 11 1999 | 
	 HEALTHCARE FINANCIAL SOLUTIONS, LLC, AS SUCCESSOR AGENT | 
	 Cylinder filling medical oxygen concentrator | 
	 
    
	 | 6478850,  | 
	 Aug 02 2000 | 
	 Wearair Oxygen Inc. | 
	 Miniaturized wearable oxygen concentrator | 
	 
    
	 | 6478857,  | 
	 May 12 1999 | 
	 RIC Investments, LLC | 
	 Total delivery oxygen concentration system | 
	 
    
	 | 6514318,  | 
	 Jun 10 1999 | 
	 AIR PRODUCTS AND CHEMICALS INC  | 
	 Multistage system for separating gas by adsorption | 
	 
    
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	 May 25 2000 | 
	 L AIR LIQUIDE SOCIETE ANONYME A DIRECTOIRE ET CONSEIL DE SURVEILLANCE POUR L ETUDE ET L EXPLOITATION DES PROCEDES GEORGES CLAUDE | 
	 Portable oxygen concentrator | 
	 
    
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	 Oct 03 2001 | 
	 Praxair Technology, Inc. | 
	 Pressure swing adsorption process for co-producing nitrogen and oxygen | 
	 
    
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	 Jul 25 1997 | 
	 Minnesota Innovative Technologies & Instruments Corporation | 
	 Automated control and conservation of supplemental respiratory oxygen | 
	 
    
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	 Apr 26 1999 | 
	 Oxygen Leisure Products Limited | 
	 Oxygen dispenser | 
	 
    
	 | 6547851,  | 
	 Aug 02 2000 | 
	 Wearair Oxygen Inc. | 
	 Miniaturized wearable oxygen concentrator | 
	 
    
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	 Jul 05 2001 | 
	 PRAXAIR TECHNOLOGY, INC | 
	 Medical oxygen concentrator | 
	 
    
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	 May 10 2000 | 
	 CAIRE INC  | 
	 Multiple bed pressure swing adsorption method and apparatus | 
	 
    
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	 Jul 25 1997 | 
	 Minnesota Innovative Technologies & Instruments Corporation | 
	 Control of supplemental respiratory oxygen | 
	 
    
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	 Aug 03 2000 | 
	 CAIRE INC  | 
	 Portable oxygen concentration system and method of using the same | 
	 
    
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	 Aug 03 2000 | 
	 CAIRE INC  | 
	 Portable oxygen concentration system and method of using the same | 
	 
    
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	 Aug 03 2000 | 
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	 Portable oxygen concentration system and method of using the same | 
	 
    
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	 Jun 16 1997 | 
	 Respironics, Inc | 
	 Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator | 
	 
    
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	 Oct 11 2002 | 
	 LUMMUS TECHNOLOGY INC  | 
	 High recovery PSA cycles and apparatus with reduced complexity | 
	 
    
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	 May 17 2002 | 
	 Pentair Filtration Solutions, LLC | 
	 Inlet silencer/filter for an oxygen concentrator | 
	 
    
	 | 6712876,  | 
	 Aug 27 2002 | 
	 COBHAM MISSION SYSTEMS DAVENPORT LSS INC  | 
	 Oxygen concentrator system with altitude compensation | 
	 
    
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	 Aug 27 2002 | 
	 COBHAM MISSION SYSTEMS DAVENPORT LSS INC  | 
	 Oxygen concentrator system | 
	 
    
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	 Jun 16 2000 | 
	 ENTERASYS NETWORKS, INC  | 
	 Reversible pivoting vane rotary compressor for a valve-free oxygen concentrator | 
	 
    
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	 Apr 09 2002 | 
	 LUMMUS TECHNOLOGY INC  | 
	 Method and apparatus for pressure swing adsorption | 
	 
    
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	 Jan 31 2002 | 
	 CAIRE INC  | 
	 Portable oxygen concentrator | 
	 
    
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	 Apr 24 2002 | 
	 CAIRE INC  | 
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