Patents by Inventor Rajnikant B. Patel
Rajnikant B. Patel 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: 11701623Abstract: The present disclosure relates to a composite membrane formed by lamination of two or more separate porous polymeric layers, as well as to a method and system for lamination. Advantageously, the resulting composite is a single layer, being difficult to separate into its component layers, yet effectively maintains the filtering capabilities of the component layers when not laminated.Type: GrantFiled: May 14, 2021Date of Patent: July 18, 2023Assignee: ENTEGRIS, INC.Inventors: Dongzhu Wu, Kwok Shun Cheng, Rajnikant B. Patel, Tony Yu, Puth Proeung, Maybelle Woo
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Publication number: 20220323912Abstract: Provided are porous polymeric filter membranes comprising a polymer having admixed therein at least one carbonaceous material. The membranes are capable of removing trace amounts of various impurities from a liquid composition, including metal ions, acids, bases, and organic contaminants.Type: ApplicationFiled: March 29, 2022Publication date: October 13, 2022Inventors: Aabid A. Mir, Jad A. Jaber, Rajnikant B. Patel, Andrew Boudreau, Vinay Kalyani
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Publication number: 20210354092Abstract: The present disclosure relates to a composite membrane formed by lamination of two or more separate porous polymeric layers, as well as to a method and system for lamination. Advantageously, the resulting composite is a single layer, being difficult to separate into its component layers, yet effectively maintains the filtering capabilities of the component layers when not laminated.Type: ApplicationFiled: May 14, 2021Publication date: November 18, 2021Inventors: Dongzhu WU, Kwok Shun CHENG, Rajnikant B. PATEL, Tony YU, Puth PROEUNG, Maybelle WOO
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Publication number: 20140339722Abstract: A multilayer porous membrane formed of an extrudable polymer is provided. The membrane is formed by co-extruding at least two compositions, each of which comprises a heated porogen and polymer while in contact with each other under conditions to minimize or prevent unstable interfacial flow between extruded layers. In a preferred embodiment, the two compositions are different such that the layers have a different average pore size.Type: ApplicationFiled: May 12, 2014Publication date: November 20, 2014Applicant: Entegris, Inc.Inventors: Larry Y. Yen, Rajnikant B. Patel
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Patent number: 8758887Abstract: A multilayer porous membrane formed of an extrudable polymer is provided. The membrane is formed by co-extruding at least two compositions, each of which comprises a heated porogen and polymer while in contact with each other under conditions to minimize or prevent unstable interfacial flow between extruded layers. In a preferred embodiment, the two compositions are different such that the layers have a different average pore size.Type: GrantFiled: December 21, 2005Date of Patent: June 24, 2014Assignee: Entegris, Inc.Inventors: Larry Yen, Rajnikant B. Patel
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Patent number: 7967882Abstract: Embodiments of the present invention provide low-profile surface mount filters. One embodiment of the present invention includes a filter housing adapted to mount on a substrate block having a plurality of flow paths and a filter cavity defined therein. The filter cavity is defined to extend in a generally horizontal direction when the low-profile filter is in use. A first flow passage is defined to connect an inlet of the filter housing to a first section of the filter cavity and a second flow passage is defined to connect a second section of the filter cavity to an outlet of the filter housing. A filter assembly is disposed in the filter cavity and sealed to the surface of the filter cavity separating the filter cavity into adjacent sections including the first section of the filter cavity and second section of the filter cavity.Type: GrantFiled: October 4, 2010Date of Patent: June 28, 2011Assignee: Entegris, Inc.Inventors: Anthony DiPrizio, Nathan Abbott, Christopher Vroman, Rajnikant B. Patel, Eric McNamara
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Publication number: 20110078886Abstract: Embodiments of the present invention provide low-profile surface mount filters. One embodiment of the present invention includes a filter housing adapted to mount on a substrate block having a plurality of flow paths and a filter cavity defined therein. The filter cavity is defined to extend in a generally horizontal direction when the low-profile filter is in use. A first flow passage is defined to connect an inlet of the filter housing to a first section of the filter cavity and a second flow passage is defined to connect a second section of the filter cavity to an outlet of the filter housing. A filter assembly is disposed in the filter cavity and sealed to the surface of the filter cavity separating the filter cavity into adjacent sections including the first section of the filter cavity and second section of the filter cavity.Type: ApplicationFiled: October 4, 2010Publication date: April 7, 2011Inventors: Anthony DiPrizio, Nathan Abbott, Christopher Vroman, Rajnikant B. Patel, Eric McNamara
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Patent number: 7806949Abstract: Embodiments of the present invention provide low-profile surface mount filters. One embodiment of the present invention includes a filter housing adapted to mount on a substrate block having a plurality of flow paths and a filter cavity defined therein. The filter cavity is defined to extend in a generally horizontal direction when the low-profile filter is in use. A first flow passage is defined to connect an inlet of the filter housing to a first section of the filter cavity and a second flow passage is defined to connect a second section of the filter cavity to an outlet of the filter housing. A filter assembly is disposed in the filter cavity and sealed to the surface of the filter cavity separating the filter cavity into adjacent sections including the first section of the filter cavity and second section of the filter cavity.Type: GrantFiled: July 27, 2009Date of Patent: October 5, 2010Assignee: Entegris, Inc.Inventors: Anthony C. DiPrizio, Nathan Abbott, Christopher Vroman, Rajnikant B. Patel, Eric McNamara
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Patent number: 7717405Abstract: Disclosed is a shell side contactor which can be used to form ozonated water. The contactor includes a shell and a plurality of porous perfluoroalkoxy resin thermoplastic hollow fibers that are potted at each end of the shell. The perfluoroalkoxy resin hollow fibers can be unskinned, skinned on their inner surface, or skinned on their outer surfaces. The contactor is provided with a spacer that spreads the hollow fibers adjacent an inlet to the shell, thereby permitting liquid flow at desirably high flow rates with acceptable pressure drop through the shell. The mass transfer efficiency of the contactor can be enhanced by jetting water into the fiber bundle and introducing gaps into the bundle.Type: GrantFiled: March 18, 2008Date of Patent: May 18, 2010Assignee: Entegris, Inc.Inventors: Bipin S. Parekh, Rajnikant B. Patel, Kwok-Shun Cheng
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Publication number: 20090282979Abstract: Embodiments of the present invention provide low-profile surface mount filters. One embodiment of the present invention includes a filter housing adapted to mount on a substrate block having a plurality of flow paths and a filter cavity defined therein. The filter cavity is defined to extend in a generally horizontal direction when the low-profile filter is in use. A first flow passage is defined to connect an inlet of the filter housing to a first section of the filter cavity and a second flow passage is defined to connect a second section of the filter cavity to an outlet of the filter housing. A filter assembly is disposed in the filter cavity and sealed to the surface of the filter cavity separating the filter cavity into adjacent sections including the first section of the filter cavity and second section of the filter cavity.Type: ApplicationFiled: July 27, 2009Publication date: November 19, 2009Applicant: Entegris, Inc.Inventors: Anthony C. DiPrizio, Nathan Abbott, Christopher Vroman, Rajnikant B. Patel, Eric McNamara
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Patent number: 7575616Abstract: Embodiments of the present invention provide low-profile surface mount filters. One embodiment of the present invention includes a filter housing adapted to mount on a substrate block having a plurality of flow paths and a filter cavity defined therein. The filter cavity is defined to extend in a generally horizontal direction when the low-profile filter is in use. A first flow passage is defined to connect an inlet of the filter housing to a first section of the filter cavity and a second flow passage is defined to connect a second section of the filter cavity to an outlet of the filter housing. A filter assembly is disposed in the filter cavity and sealed to the surface of the filter cavity separating the filter cavity into adjacent sections including the first section of the filter cavity and second section of the filter cavity.Type: GrantFiled: February 10, 2006Date of Patent: August 18, 2009Assignee: Entegris, Inc.Inventors: Anthony DiPrizio, Nathan Abbott, Christopher Vroman, Rajnikant B. Patel, Eric McNamara
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Publication number: 20080156191Abstract: Disclosed is a shell side contactor which is highly efficient for forming relatively high concentration of ozonated water comprising a shell containing perfluoroalkoxy resin thermoplastic hollow fibers used as a porous barrier. The perfluoroalkoxy resin comprises a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether or a tetrafluoroethyl-co-hexafluoropropylene (FEP) copolymer. The perfluoroalkoxy resin hollow fibers can be unskinned, skinned on their inner surface or skinned on their outer surfaces. The device is provided with spacer means for separating unpotted hollow fibers adjacent an inlet to the shell, thereby permitting liquid flow through the shell at desirably high flow rates with acceptable pressure drop through the shell.Type: ApplicationFiled: March 18, 2008Publication date: July 3, 2008Inventors: BIPIN S. PAREKH, Rajnikant B. Patel, Kwok-Shun Cheng
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Patent number: 7347937Abstract: A filtration cartridge having a housing with an inlet and an outlet and a filtration membrane contained within the housing and located between the inlet and the outlet is described. The membrane is sealed in such a manner that all fluid must flow through the membrane between entering the inlet and leaving the outlet of the housing. The entire cartridge, housing, membrane and any other components are all formed of one or more perfluorinated thermoplastic resins. These resins preferably are PFA, MFA, FEP and blends thereof. The membrane may be in the form of hollow fibers, wound fibers such as in a depth filter, or a flat sheet which may be formed into various configurations such as spiral filters, pleated filters, spiral pleated filters, disks and the like. These cartridges provide an inert, high temperature and acid/oxidative chemical resistant filter having properties similar to that of PTFE resins.Type: GrantFiled: January 28, 2000Date of Patent: March 25, 2008Assignee: Entegris, Inc.Inventors: Kwok-Shun Cheng, Cha P. Doh, Larry Y. Yen, Rajnikant B. Patel, T. Dean Gates
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Patent number: 6977043Abstract: Hollow fiber membranes having a skinned surface on one diameter, and a porous surface on the opposite diameter are produced from perfluorinated thermoplastic polymers by extruding a heated solution of the polymer having a low critical solution temperature directly into a cooling bath to form the porous membrane by liquid-liquid phase separation. Extrusion can be conducted either vertically or horizontally. The hollow fiber membranes are useful as ultrafiltration membranes and as membrane contactors.Type: GrantFiled: March 17, 2004Date of Patent: December 20, 2005Assignee: Mykrolis CorporationInventors: Kwok-Shun Cheng, T. Dean Gates, Larry Y. Yen, Rajnikant B. Patel
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Patent number: 6921482Abstract: Hollow fiber membranes having a skinned surface on one diameter, and a porous surface on the opposite diameter arm produced from perfluorinated thermoplastic polymers by extruding a heated solution of the polymer having a lower critical solution temperature directly into a cooling bath to form the porous membrane by liquid-liquid phase separation. Extrusion can be conducted either vertically or horizontally. The hollow fiber membranes are useful as ultrafiltration membranes and as membrane contactors.Type: GrantFiled: January 27, 2000Date of Patent: July 26, 2005Assignee: Mykrolis CorporationInventors: Kwok-Shun Cheng, T. Dean Gates, Larry Y. Yen, Rajnikant B. Patel
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Patent number: 6802972Abstract: High flux porous hollow fiber membranes are produced from perfluorinated thermoplastic polymers by extruding a heated solution of the polymer having a lower critical solution temperature directly into a cooling bath to form the porous membrane by liquid-liquid phase separation. Extrusion can be conducted either vertically or horizontally.Type: GrantFiled: July 26, 2001Date of Patent: October 12, 2004Assignee: Mykrolis CorporationInventors: Kwok-Shun Cheng, Rajnikant B. Patel, T. Dean Gates
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Patent number: 6802973Abstract: High flux porous hollow fiber membranes are produced from perfluorinated thermoplastic polymers by extruding heated solution of the polymer having a lower critical solution temperature directly into a cooling bath to form the porous membrane by liquid-liquid phase separation. Extrusion can be conducted either vertically or horizontally.Type: GrantFiled: May 13, 2003Date of Patent: October 12, 2004Assignee: Mykrolis CorporationInventors: Kwok-Shun Cheng, Rajnikant B. Patel, T. Dean Gates
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Publication number: 20040154986Abstract: Hollow fiber membranes having a skinned surface on one diameter, and a porous surface on the opposite diameter are produced from perfluorinated thermoplastic polymers by extruding a heated solution of the polymer having a low critical solution temperature directly into a cooling bath to form the porous membrane by liquid-liquid phase separation. Extrusion can be conducted either vertically or horizontally. The hollow fiber membranes are useful as ultrafiltration membranes and as membrane contactors.Type: ApplicationFiled: March 17, 2004Publication date: August 12, 2004Inventors: Kwok-Shun Cheng, T. Dean Gates, Larry Y. Yen, Rajnikant B. Patel
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Publication number: 20030201223Abstract: High flux porous hollow fiber membranes are produced from perfluorinated thermoplastic polymers by extruding a heated solution of the polymer having a lower critical solution temperature directly into a cooling bath to form the porous membrane by liquid-liquid phase separation. Extrusion can be conducted either vertically or horizontally.Type: ApplicationFiled: May 13, 2003Publication date: October 30, 2003Inventors: Kwok-Shun Cheng, Rajnikant B. Patel, T. Dean Gates