Patents by Inventor James Timothy Macheras
James Timothy Macheras 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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Publication number: 20230194195Abstract: Method for cryogenic cooling of a first fluid by heat exchange with at least one second fluid in a heat exchanger, the first fluid and/or the second fluid being at a temperature between ?100° C. and ?273° C., wherein the heat exchanger is of the type with polymer microtubes, i.e. comprising a plurality of microtubes made of polymer and having a diameter of between 0.1 mm and 1 cm, one of the first and second fluids being circulated inside said microtubes while the other fluid is circulated around said microtubes.Type: ApplicationFiled: March 25, 2021Publication date: June 22, 2023Applicants: L'Air Liquide, Societe Anonyme pour l'Etude et l?Exploitation des Procedes Georges Claude, Air Liquide Advanced Technologies U.S. LLCInventors: Guillaume DELAUTRE, Loic JEUNESSE, Golo ZICK, Pierre BARJHOUX, Thomas GATES, James Timothy MACHERAS
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Patent number: 6923846Abstract: A method for fabricating a composite membrane includes coating a substrate, such as, for example, an asymmetrical porous hollow fiber substrate, with a solution which includes a perfluorinated polymer and a perfluorinated solvent. Prior to coating, the substrate is impregnated with an impregnation fluid which is immiscible with the perfluorinated solvent. The method of the invention further includes removing the perfluorinated solvent and the impregnation fluid. A composite membrane includes a porous asymmetric hollow fiber substrate having an outer surface coated with a perfluoropolymer coating. Separation devices which include composite membranes and methods of separating a fluid mixture into a fraction enriched in a first component and a fraction depleted in that component also are described.Type: GrantFiled: February 21, 2003Date of Patent: August 2, 2005Assignee: L' Air Liquide—Societe Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges ClaudeInventors: Joyce Katz Nelson, Benjamin Bikson, James Timothy Macheras
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Patent number: 6716270Abstract: The invention relates to preparation and uses of novel polymeric materials, polyimide amic acid salts (PIAAS). The use of these materials for the fabrication of fluid separation membranes is further disclosed.Type: GrantFiled: January 23, 2003Date of Patent: April 6, 2004Assignee: Praxair Technology, Inc.Inventors: Yong Ding, Benjamin Bikson, Joyce Katz Nelson, James Timothy Macheras
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Patent number: 6709494Abstract: Tubesheet materials for hollow fiber membrane module are disclosed using materials to provide for improved performance at high temperatures. The tubesheets are cast from a mixture of solidifiable resinous components that are designed to provide desirable processing characteristics to the mixture in its initial liquid state, as well as improved thermal properties its final cured casting state.Type: GrantFiled: November 7, 2002Date of Patent: March 23, 2004Assignee: Praxair Technology, Inc.Inventors: James Timothy Macheras, Salvatore Giglia
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Publication number: 20030164090Abstract: The invention relates to preparation and uses of novel polymeric materials, polyimide amic acid salts (PIAAS). The use of these materials for the fabrication of fluid separation membranes is further disclosed.Type: ApplicationFiled: January 23, 2003Publication date: September 4, 2003Inventors: Yong Ding, Benjamin Bikson, Joyce Katz Nelson, James Timothy Macheras
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Publication number: 20030159583Abstract: Tubesheet materials for hollow fiber membrane module are disclosed. Said materials provide for improved performance at high temperatures. The tubesheets are cast from a blend of solidifiable resinous components that are designed to provide desirable processing characteristics to the mixture in its liquid state, as well as improved thermal properties of the cured casting.Type: ApplicationFiled: November 7, 2002Publication date: August 28, 2003Inventors: James Timothy Macheras, Salvatore Giglia
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Publication number: 20030126988Abstract: A method for fabricating a composite membrane includes coating a substrate, such as, for example, an asymmetrical porous hollow fiber substrate, with a solution which includes a perfluorinated polymer and a perfluorinated solvent. Prior to coating, the substrate is impregnated with an impregnation fluid which is immiscible with the perfluorinated solvent. The method of the invention further includes removing the perfluorinated solvent and the impregnation fluid. A composite membrane includes a porous asymmetric hollow fiber substrate having an outer surface coated with a perfluoropolymer coating. Separation devices which include composite membranes and methods of separating a fluid mixture into a fraction enriched in a first component and a fraction depleted in that component also are described.Type: ApplicationFiled: February 21, 2003Publication date: July 10, 2003Applicant: Praxair Technology, Inc.Inventors: Joyce Katz Nelson, Benjamin Bikson, James Timothy Macheras
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Patent number: 6540813Abstract: A method for fabricating a composite membrane includes coating a substrate, such as, for example, an asymmetrical porous hollow fiber substrate, with a solution which includes a perfluorinated polymer and a perfluorinated solvent. Prior to coating, the substrate is impregnated with an impregnation fluid which is immiscible with the perfluorinated solvent. The method of the invention further includes removing the perfluorinated solvent and the impregnation fluid. A composite membrane includes a porous asymmetric hollow fiber substrate having an outer surface coated with a perfluoropolymer coating. Separation devices which include composite membranes and methods of separating a fluid mixture into a fraction enriched in a first component and a fraction depleted in that component also are described.Type: GrantFiled: April 20, 2001Date of Patent: April 1, 2003Assignee: Praxair Technology, Inc.Inventors: Joyce Katz Nelson, Benjamin Bikson, James Timothy Macheras
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Publication number: 20020038602Abstract: A method for fabricating a composite membrane includes coating a substrate, such as, for example, an asymmetrical porous hollow fiber substrate, with a solution which includes a perfluorinated polymer and a perfluorinated solvent. Prior to coating, the substrate is impregnated with an impregnation fluid which is immiscible with the perfluorinated solvent. The method of the invention further includes removing the perfluorinated solvent and the impregnation fluid. A composite membrane includes a porous asymmetric hollow fiber substrate having an outer surface coated with a perfluoropolymer coating. Separation devices which include composite membranes and methods of separating a fluid mixture into a fraction enriched in a first component and a fraction depleted in that component also are described.Type: ApplicationFiled: April 20, 2001Publication date: April 4, 2002Applicant: Praxair Technology, Inc.Inventors: Joyce Katz Nelson, Benjamin Bikson, James Timothy Macheras
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Patent number: 6290756Abstract: Multicomponent hollow fiber membrane tubesheets are disclosed that provide for improved membrane performance, particularly at high operating pressures. The multicomponent tubesheets have an epoxy resin having, when cured, different degrees of hardness in different portions of the tubesheet. Methods for producing such multicomponent tubesheets are also provided.Type: GrantFiled: December 3, 1997Date of Patent: September 18, 2001Assignee: Praxair Technology, Inc.Inventors: James Timothy Macheras, Cheryl Ann Ford, Joyce Katz Nelson
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Patent number: 5910274Abstract: Improved anisotropic fluid separation membranes are prepared from blends of polymers with surface energy differences. The membranes are formulated by processes wherein low surface energy polymer with desirable fluid separation and permeation characteristics is preferentially concentrated in the surface discriminating layer of the membrane.Type: GrantFiled: September 4, 1997Date of Patent: June 8, 1999Assignee: Praxair Technology, Inc.Inventors: James Timothy Macheras, Benjamin Bikson, Joyce Katz Nelson
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Patent number: 5891572Abstract: Improved anisotropic fluid separation membranes are prepared from blends of polymers with surface energy differences. The membranes are formulated by processes wherein low surface energy polymer with desirable fluid separation and permeation characteristics is preferentially concentrated in the surface discriminating layer of the membrane.Type: GrantFiled: October 25, 1996Date of Patent: April 6, 1999Assignee: Praxair Technology, Inc.Inventors: James Timothy Macheras, Benjamin Bikson, Joyce Katz Nelson
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Patent number: 5871680Abstract: A process for the preparation of anisotropic hollow fibers useful as permselective separation membranes and for producing composite membranes thereof, involves extruding a spinning dope through a spinneret that extends into a coagulation chamber maintained at subatmospheric pressure, conveying the nascent hollow fiber through a column that extends into the reduced pressure chamber, and contains at least two different abutting liquids arranged in sequence. An apparatus for conducting the process includes the vacuum chamber, the spinneret and the column that extends into the vacuum chamber and is equipped with entrance and exit ports for introduction and removal of at least two abutting liquid coagulation media.Type: GrantFiled: August 8, 1997Date of Patent: February 16, 1999Assignee: Praxair Technology, Inc.Inventors: James Timothy Macheras, Thomas Anthony Bolan, Benjamin Bikson
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Patent number: 5733657Abstract: Improved anisotropic fluid separation membranes are prepared from blends of polymers with surface energy differences. The membranes are formulated by processes wherein low surface energy polymer with desirable fluid separation and permeation characteristics is preferentially concentrated in the surface discriminating layer of the membrane.Type: GrantFiled: October 11, 1994Date of Patent: March 31, 1998Assignee: Praxair Technology, Inc.Inventors: James Timothy Macheras, Benjamin Bikson, Joyce Katz Nelson