Patents by Inventor Yongxian Zeng
Yongxian Zeng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10035745Abstract: A method of purifying crude sevoflurane comprising (i) providing crude sevoflurane and an aqueous base to a first centrifugal separator, wherein the crude sevoflurane comprises sevoflurane and hexafluoroisopropanol; (ii) mixing the crude sevoflurane and the aqueous base in the first centrifugal separator; and (iii) separating the sevoflurane from the aqueous base in the first centrifugal separator, thereby purifying the crude sevoflurane.Type: GrantFiled: July 30, 2016Date of Patent: July 31, 2018Assignees: BAXTER INTERNATIONAL INC., BAXTER HEALTHCARE SAInventors: Yongxian Zeng, Hong-Chang Lee, Linas Kudzma
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Patent number: 8729313Abstract: The present invention provides a method for forming sevoflurane comprising (i) combining chlorosevo ether, a nucleophilic fluoride reagent, and a solvent comprising sevoflurane to form an initial reaction mixture and (ii) reacting the initial reaction mixture to form additional sevoflurane relative to the amount of sevoflurane present in the initial reaction mixture. The present disclosure is also directed to a method for forming sevoflurane, comprising: initiating a reaction between chlorosevo ether and a nucleophilic fluoride reagent in an initial reaction mixture further comprising a solvent comprising sevoflurane, thereby forming additional sevoflurane relative to the amount of sevoflurane present in the initial reaction mixture.Type: GrantFiled: August 15, 2011Date of Patent: May 20, 2014Assignees: Baxter International Inc., Baxter Healthcare SAInventors: Linas Kudzma, Ronald Bell, Yongxian Zeng, Leonid A. Rozov
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Publication number: 20130046117Abstract: The present invention provides a method for forming sevoflurane comprising (i) combining chlorosevo ether, a nucleophilic fluoride reagent, and a solvent comprising sevoflurane to form an initial reaction mixture and (ii) reacting the initial reaction mixture to form additional sevoflurane relative to the amount of sevoflurane present in the initial reaction mixture. The present disclosure is also directed to a method for forming sevoflurane, comprising: initiating a reaction between chlorosevo ether and a nucleophilic fluoride reagent in an initial reaction mixture further comprising a solvent comprising sevoflurane, thereby forming additional sevoflurane relative to the amount of sevoflurane present in the initial reaction mixture.Type: ApplicationFiled: August 15, 2011Publication date: February 21, 2013Applicants: BAXTER HEALTHCARE S.A., BAXTER INTERNATIONAL INC.Inventors: Linas Kudzma, Ronald Bell, Yongxian Zeng, Leonid A. Rozov
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Patent number: 7303606Abstract: Production of oxygen-enriched gas streams is disclosed herein. Air streams contact an oxygen-selective mixed conductor particularly a perovskite material whereby oxygen is retained or adsorbed on the perovskite and can be employed in a variety of processes such as in combusting a fuel gas, heat recovery and boiler related operations.Type: GrantFiled: March 29, 2005Date of Patent: December 4, 2007Assignee: The BOC Group, Inc.Inventors: Yongxian Zeng, Divyanshu R. Acharya, Satish S. Tamhankar, Narayanan Ramprasad, Ramakrishnan Ramachandran, Frank R. Fitch, Donald L. MacLean, Jerry Y. S. Lin, Richard H. Clarke
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Patent number: 7070752Abstract: Supported perovskite-type oxides are described. The perovskite-type oxides have the general formula of AxA?x?ByB?y?O3??, wherein A is an ion of a metal of Group IIIa or IIIb of the periodic table of elements or mixtures thereof; A? is an ion of a metal of Groups Ia or IIa of the periodic table or mixtures thereof; B and B? are ions of a d-block transition metal of the periodic table or mixtures thereof; x, x?, y and y? vary from 0 to 1; 0.95<x+x?<1.05; 0.95<y+y?<1.05; ? is the deviation from ideal oxygen stoichiometry. This invention also provides for the selection of support materials and the shapes of supported perovskite-type oxides as well as the methods for making them.Type: GrantFiled: January 19, 2005Date of Patent: July 4, 2006Assignee: The BOC Group, Inc.Inventors: Yongxian Zeng, Rudolph J. Wolf, Frank R. Fitch, Martin Bülow, Satish S. Tamhankar, Divyanshu R. Acharya
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Publication number: 20050223891Abstract: Production of oxygen-enriched gas streams is disclosed herein. Air streams contact an oxygen-selective mixed conductor particularly a perovskite material whereby oxygen is retained or adsorbed on the perovskite and can be employed in a variety of processes such as in combusting a fuel gas, heat recovery and boiler related operations.Type: ApplicationFiled: March 29, 2005Publication date: October 13, 2005Inventors: Yongxian Zeng, Divyanshu Acharya, Satish Tamhankar, Narayanan Ramprasad, Ramakrishnan Ramachandran, Frank Fitch, Donald MacLean, Jerry Lin, Richard Clarke
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Publication number: 20050164890Abstract: Supported perovskite-type oxides are described. The perovskite-type oxides have the general formula of AxA?x?ByB?y?O3-?, wherein A is an ion of a metal of Group IIIa or IIIb of the periodic table of elements or mixtures thereof; A? is an ion of a metal of Groups Ia or IIa of the periodic table or mixtures thereof; B and B? are ions of a d-block transition metal of the periodic table or mixtures thereof; x, x?, y and y? vary from 0 to 1; 0.95<x+x?<1.05; 0.95<y+y?<1.05; ? is the deviation from ideal oxygen stoichiometry. This invention also provides for the selection of support materials and the shapes of supported perovskite-type oxides as well as the methods for making them.Type: ApplicationFiled: January 19, 2005Publication date: July 28, 2005Inventors: Yongxian Zeng, Rudolph Wolf, Frank Fitch, Martin Bulow, Satish Tamhankar, Divyanshu Acharya
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Patent number: 6761838Abstract: Partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide is carried out by a cyclical process, which includes (a) contacting an oxygen ion conducting ceramic with air at a pressure between about 1 and 50 bara in a reactor, wherein oxygen from the air reacts with the ceramic, thereby producing an oxygen-enriched ceramic, and (b) contacting the hot, oxygen-enriched ceramic with hydrocarbon gas and optionally steam in the reactor. During the partial oxidation reaction phase of the process, the oxygen-enriched ceramic reacts with the hydrocarbon, thereby producing the desired gas products and regenerating the oxygen ion conducting ceramic for the next cycle of the process.Type: GrantFiled: July 20, 2001Date of Patent: July 13, 2004Assignee: The BOC Group, Inc.Inventors: Yongxian Zeng, Satish S. Tamhankar, Narayanan Ramprasad, Ravi Jain, Donald L. MacLean
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Publication number: 20030138747Abstract: Production of oxygen-enriched gas streams is disclosed herein. Air streams contact an oxygen-selective mixed conductor particularly a perovskite material whereby oxygen is retained or adsorbed on the perovskite and can be employed in a variety of processes such as in combusting a fuel gas, heat recovery and boiler related operations.Type: ApplicationFiled: December 6, 2002Publication date: July 24, 2003Inventors: Yongxian Zeng, Divyanshu R. Acharya, Satish S. Tamhankar, Narayanan Ramprasad, Ramakrishnan Ramachandran, Frank R. Fitch, Donald L. MacLean, Jerry Y.S. Lin, Richard H. Clarke
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Publication number: 20020179887Abstract: Supported perovskite-type oxides are described. The perovskite-type oxides have the general formula of AxA′x′ByB′y′O3-&dgr;, wherein A is an ion of a metal of Group IIIa or IIIb of the periodic table of elements or mixtures thereof; A′ is an ion of a metal of Groups Ia or IIa of the periodic table or mixtures thereof; B and B′ are ions of a d-block transition metal of the periodic table or mixtures thereof; x, x′, y and y′ vary from 0 to 1; 0.95<x+x′<1.05; 0.95<y+y′<1.05; &dgr; is the deviation from ideal oxygen stoichiometry. This invention also provides for the selection of support materials and the shapes of supported perovskite-type oxides as well as the methods for making them.Type: ApplicationFiled: April 29, 2002Publication date: December 5, 2002Inventors: Yongxian Zeng, Rudolph J. Wolf, Frank R. Fitch, Martin Bulow, Satish S. Tamhankar, Divyanshu R. Acharya
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Patent number: 6464955Abstract: Partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide is carried out by a fixed bed or a fluidized bed process which includes the steps of passing steam and/or carbon dioxide through a perovskite-type ceramic mixed conductor in an adsorption zone at an elevated temperature, thereby at least partially saturating the mixed conductor with oxygen and producing hydrogen and/or carbon monoxide, and subsequently contacting the hot, at least partially oxygen-saturated mixed conductor with a hydrocarbon in a partial oxidation reaction zone. During the partial oxidation reaction phase of the process, the sorbed oxygen reacts with the hydrocarbon, thereby producing hydrogen and carbon monoxide.Type: GrantFiled: May 13, 1999Date of Patent: October 15, 2002Assignee: The BOC Group, Inc.Inventors: Yongxian Zeng, Donald L. MacLean, Satish S. Tamhankar, Narayanan Ramprasad, Frank R. Fitch, Kirk Walton Limbach
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Publication number: 20020064494Abstract: Partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide is carried out by a fixed bed or a fluidized bed process which includes the steps of passing steam and/or carbon dioxide through a perovskite-type ceramic mixed conductor in an adsorption zone at an elevated temperature, thereby at least partially saturating the mixed conductor with oxygen and producing hydrogen and/or carbon monoxide, and subsequently contacting the hot, at least partially oxygen-saturated mixed conductor with a hydrocarbon in a partial oxidation reaction zone. During the partial oxidation reaction phase of the process, the sorbed oxygen reacts with the hydrocarbon, thereby producing hydrogen and carbon monoxide.Type: ApplicationFiled: May 13, 1999Publication date: May 30, 2002Inventors: YONGXIAN ZENG, DONALD L. MACLEAN, SATISH S. TAMHANKAR, NARAYANAN RAMPRASAD, FRANK R. FITCH, KIRK WALTON LIMBACH
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Patent number: 6379586Abstract: Partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide is carried out by a cyclical process which includes passing air through a perovskite ceramic substance at elevated temperature, thereby adsorbing oxygen from the air, and subsequently contacting the hot oxygen-containing ceramic substance with a hydrocarbon. During the partial oxidation reaction phase of the process, the sorbed oxygen reacts with the hydrocarbon, thereby producing the desired gas products and regenerating the adsorbent for the next cycle of the process.Type: GrantFiled: October 20, 1998Date of Patent: April 30, 2002Assignee: The BOC Group, Inc.Inventors: Yongxian Zeng, Ravi Jain, Satish S. Tamhankar, Donald L. MacLean, Narayanan Ramprasad
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Publication number: 20020010220Abstract: Partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide is carried out by a cyclical process, which includes (a) contacting an oxygen ion conducting ceramic with air at a pressure between about 1 and 50 bara in a reactor, wherein oxygen from the air reacts with the ceramic, thereby producing an oxygen-enriched ceramic, and (b) contacting the hot, oxygen-enriched ceramic with hydrocarbon gas and optionally steam in the reactor. During the partial oxidation reaction phase of the process, the oxygen-enriched ceramic reacts with the hydrocarbon, thereby producing the desired gas products and regenerating the oxygen ion conducting ceramic for the next cycle of the process.Type: ApplicationFiled: July 20, 2001Publication date: January 24, 2002Inventors: Yongxian Zeng, Satish S. Tamhankar, Narayanan Ramprasad, Ravi Jain, Donald L. MacLean
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Patent number: 6143203Abstract: Partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide is carried out by a fluidized bed process which includes the steps of passing air through a perovskite-type ceramic mixed conductor in an adsorption zone at an elevated temperature, thereby at least partially saturating the mixed conductor with oxygen, and subsequently contacting the hot, at least partially oxygen-saturated mixed conductor with a hydrocarbon in a partial oxidation reaction zone. During the partial oxidation reaction phase of the process, the sorbed oxygen reacts with the hydrocarbon, thereby producing hydrogen, carbon monoxide or mixtures of these. The oxygen-depleted mixed conductor is recycled to the adsorption zone.Type: GrantFiled: April 13, 1999Date of Patent: November 7, 2000Assignee: The BOC Group, Inc.Inventors: Yongxian Zeng, Satish S. Tamhankar, Kirk Walton Limbach, Sekharipuram V. Krishnan
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Patent number: 6059858Abstract: Oxygen is removed from gas streams by subjecting the gas stream to a pressure swing adsorption process carried out at temperature in the range of 300 to 1400.degree. C. using as adsorbent a perovskite material having the structural formula A.sub.1-x M.sub.x BO.sub.3-.delta., where A is a rare earth ion, M is Na, Ca, Sr, Ba or mixtures of these, B is Co, Mn, Cr or Fe, x varies from 0.1 to 1 and .delta. is the deviation from stoichiometric composition resulting from the substitution of Sr, Ca and Ba for rare earth ions.Type: GrantFiled: October 20, 1998Date of Patent: May 9, 2000Assignee: The BOC Group, Inc.Inventors: Yue-Sheng Lin, Donald L. MacLean, Yongxian Zeng