Patents by Inventor Vasuhi Rasanayagam

Vasuhi Rasanayagam 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).

  • Patent number: 11434153
    Abstract: Disclosed are decoupled systems and methods for producing an oxidized liquid. The method comprises the steps of generating an ozone strong water in a mass transfer unit, mixing the ozone strong water with a process liquid in a mixing unit to form a homogeneous and gas-free mixture of the ozone strong water and the process liquid, forwarding the homogeneous and gas-free mixture to a reaction unit, and producing the oxidized liquid in the reaction unit. The method utilizes the acidic feed liquid to generate ozone dissolved in water having a higher concentration at a saturated or nearly saturated concentration compared to prior art processes at atmospheric pressure and neutral or alkaline pH.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: September 6, 2022
    Assignees: L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés George Claude, American Air Liquide, Inc.
    Inventors: Jan Mante, Joerg Schwerdt, Vasuhi Rasanayagam, Rovshan Mahmudov, Siavash Isazadeh
  • Publication number: 20210331955
    Abstract: Disclosed are systems and methods for mixing a gas-free liquid oxidant with a process liquid to form a homogeneous and gas-free mixture with minimized degassing. The mixing system comprises an injection device, integrating with a pipe through which a process liquid flows, configured and adapted to inject a gas-free liquid oxidant into the process liquid, and a mixer, fluidly connected to the pipe and the injection device, configured and adapted to mix the process liquid and the gas-free liquid oxidant therein to form a homogeneous and gas-free mixture of the process liquid and the gas-free liquid oxidant with minimal degassing. The method comprises the steps of a) injecting the gas-free liquid oxidant into the process liquid, and b) mixing the gas-free liquid oxidant and the process liquid to form the homogeneous and gas-free mixture. The gas-free liquid oxidant is ozone strong water.
    Type: Application
    Filed: July 2, 2021
    Publication date: October 28, 2021
    Inventors: Jan Mante, Vasuhi Rasanayagam, Midhun Joy
  • Patent number: 11084744
    Abstract: Disclosed are systems and methods for mixing a gas-free liquid oxidant with a process liquid to form a homogeneous and gas-free mixture with minimized degassing. The mixing system comprises an injection device, integrating with a pipe through which a process liquid flows, configured and adapted to inject a gas-free liquid oxidant into the process liquid, and a mixer, fluidly connected to the pipe and the injection device, configured and adapted to mix the process liquid and the gas-free liquid oxidant therein to form a homogeneous and gas-free mixture of the process liquid and the gas-free liquid oxidant with minimal degassing. The method comprises the steps of a). injecting the gas-free liquid oxidant into the process liquid, and b). mixing the gas-free liquid oxidant and the process liquid to form the homogeneous and gas-free mixture. The gas-free liquid oxidant is ozone strong water.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: August 10, 2021
    Assignees: L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude, American Air Liquide, Inc.
    Inventors: Jan Mante, Vasuhi Rasanayagam, Midhun Joy
  • Patent number: 10858271
    Abstract: Disclosed are methods for continuous production of ozone strong water, the methods comprising the steps of injecting an acidification agent into a pressurized feed water to maintain a pH value of the pressurized feed water below 7, diffusing a two-phase mixture of O2-O3 gas and recirculated water into a body of acidic pressurized water to dissolve ozone into the acidic pressurized water. The disclosed methods include simultaneously maintaining a start-up mode in an upper portion of the dissolution column that favors high efficiency of ozone mass transfer into the acidic pressurized water and a steady state mode in a lower portion of the dissolution column that favors a high concentration of dissolved ozone in the acidic pressurized water coexistent in the body of the acidic pressurized water, wherein an ozone concentration gradient is formed along a height of the body of the acidic pressurized water.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: December 8, 2020
    Assignees: L'Air Liquide, SociétéAnonyme pour l'Etude et l'Exploitation des Procédés Claude, American Air Liquide, Inc.
    Inventors: Jan Mante, Vasuhi Rasanayagam, Midhun Joy, Rovshan Mahmudov, Siavash Isazadeh
  • Patent number: 10851000
    Abstract: Disclosed are systems for continuous production of ozone strong water, the systems comprising an injection device that injects an acidification agent into a pressurized feed liquid, a diffuser device that injects ozone into a body of the acidic pressurized feed water, and injection nozzles each controlled by a valve that adjust a flow rate of the ozone strong water discharged from a dissolution column to match a flow rate of the acidic pressurized feed water fed to the dissolution column, thereby maintaining a start-up mode in an upper portion of the dissolution column that favors a high efficiency of ozone mass transfer and a steady-state mode in a lower portion of the dissolution column that favors a high dissolved ozone concentration coexistent in the body of the acidic pressurized liquid, wherein a concentration gradient of dissolved ozone is formed along a height of the body of the acidic pressurized liquid.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: December 1, 2020
    Assignees: L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude, American Air Liquide, Inc.
    Inventors: Jan Mante, Vasuhi Rasanayagam, Midhun Joy, Rovshan Mahmudov, Siavash Isazadeh
  • Patent number: 10683221
    Abstract: A device and method for injection of oxygen-rich gas into a body of liquid with oxygen recycling are disclosed. The device comprises a rotary hollow shaft vertically passing through a float partially immersed in the liquid, an impeller attached to the lower end of the rotary hollow shaft, a columnar structure, surrounding the rotary hollow shaft, mounted on the bottom side of the float and vertically extending into the liquid, a gas diffusion chamber formed by the columnar structure, the float and the liquid surface under the float, and a gas injection conduit passing through the float for delivering the oxygen gas into the gas diffusion chamber, wherein a vacuum is generated in the body of the liquid around the impeller when the impeller is driven to rotate, so that the oxygen-rich gas in the gas diffusion chamber is sucked into the body of the liquid and mixed therein.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: June 16, 2020
    Assignees: L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude, American Air Liquide, Inc.
    Inventors: Milson Carvalho, Maicon Neryz, Ivan Pajolli, Joerg Schwerdt, Vasuhi Rasanayagam, Chunqiong Shi
  • Publication number: 20190300405
    Abstract: Disclosed are systems for continuous production of ozone strong water, the systems comprising an injection device that injects an acidification agent into a pressurized feed liquid, a diffuser device that injects ozone into a body of the acidic pressurized feed water, and injection nozzles each controlled by a valve that adjust a flow rate of the ozone strong water discharged from a dissolution column to match a flow rate of the acidic pressurized feed water fed to the dissolution column, thereby maintaining a start-up mode in an upper portion of the dissolution column that favors a high efficiency of ozone mass transfer and a steady-state mode in a lower portion of the dissolution column that favors a high dissolved ozone concentration coexistent in the body of the acidic pressurized liquid, wherein a concentration gradient of dissolved ozone is formed along a height of the body of the acidic pressurized liquid.
    Type: Application
    Filed: July 26, 2018
    Publication date: October 3, 2019
    Inventors: Jan MANTE, Vasuhi Rasanayagam, Midhun Joy, Rovshan Mahmudov, Siavash Isazadeh
  • Publication number: 20190300404
    Abstract: Disclosed are systems and methods for mixing a gas-free liquid oxidant with a process liquid to form a homogeneous and gas-free mixture with minimized degassing. The mixing system comprises an injection device, integrating with a pipe through which a process liquid flows, configured and adapted to inject a gas-free liquid oxidant into the process liquid, and a mixer, fluidly connected to the pipe and the injection device, configured and adapted to mix the process liquid and the gas-free liquid oxidant therein to form a homogeneous and gas-free mixture of the process liquid and the gas-free liquid oxidant with minimal degassing. The method comprises the steps of a). injecting the gas-free liquid oxidant into the process liquid, and b). mixing the gas-free liquid oxidant and the process liquid to form the homogeneous and gas-free mixture. The gas-free liquid oxidant is ozone strong water.
    Type: Application
    Filed: March 28, 2018
    Publication date: October 3, 2019
    Inventors: Jan Mante, Vasuhi Rasanayagam, Midhun Joy
  • Publication number: 20190300403
    Abstract: Disclosed are decoupled systems and methods for producing an oxidized liquid. The method comprises the steps of generating an ozone strong water in a mass transfer unit, mixing the ozone strong water with a process liquid in a mixing unit to form a homogeneous and gas-free mixture of the ozone strong water and the process liquid, forwarding the homogeneous and gas-free mixture to a reaction unit, and producing the oxidized liquid in the reaction unit. The method utilizes the acidic feed liquid to generate ozone dissolved in water having a higher concentration at a saturated or nearly saturated concentration compared to prior art processes at atmospheric pressure and neutral or alkaline pH.
    Type: Application
    Filed: March 28, 2018
    Publication date: October 3, 2019
    Inventors: Jan Mante, Joerg Schwerdt, Vasuhi Rasanayagam, Rovoshan Mahmudov, Siavash Isazadeh
  • Publication number: 20190299170
    Abstract: Disclosed are methods for continuous production of ozone strong water, the methods comprising the steps of injecting an acidification agent into a pressurized feed water to maintain a pH value of the pressurized feed water below 7, diffusing a two-phase mixture of O2-O3 gas) and recirculated water into a body of acidic pressurized water to dissolve ozone into the acidic pressurized water. The disclosed methods include simultaneously maintaining a start-up mode in an upper portion of the dissolution column that favors high efficiency of ozone mass transfer into the acidic pressurized water and a steady state mode in a lower portion of the dissolution column that favors a high concentration of dissolved ozone in the acidic pressurized water coexistent in the body of the acidic pressurized water, wherein an ozone concentration gradient is formed along a height of the body of the acidic pressurized water.
    Type: Application
    Filed: July 26, 2018
    Publication date: October 3, 2019
    Inventors: Jan MANTE, Vasuhi RASANAYAGAM, Midhun JOY, Rovshan MAHMUDOV, Siavash ISAZADEH
  • Publication number: 20190185353
    Abstract: A device and method for injection of oxygen-rich gas into a body of liquid with oxygen recycling are disclosed. The device comprises a rotary hollow shaft vertically passing through a float partially immersed in the liquid, an impeller attached to the lower end of the rotary hollow shaft, a columnar structure, surrounding the rotary hollow shaft, mounted on the bottom side of the float and vertically extending into the liquid, a gas diffusion chamber formed by the columnar structure, the float and the liquid surface under the float, and a gas injection conduit passing through the float for delivering the oxygen gas into the gas diffusion chamber, wherein a vacuum is generated in the body of the liquid around the impeller when the impeller is driven to rotate, so that the oxygen-rich gas in the gas diffusion chamber is sucked into the body of the liquid and mixed therein.
    Type: Application
    Filed: December 5, 2018
    Publication date: June 20, 2019
    Inventors: Milson CARVALHO, Maicon Neryz, Ivan Pajolli, Joerg Schwerdt, Vasuhi Rasanayagam
  • Patent number: 9714409
    Abstract: The invention may be broadly defined as the addition of Argon to FFPE procedures as an RNA stabilizing agent. Argon is an inert gas from the Noble gas group with low saturation concentrations in water. It is therefore highly surprising that Argon would have any effect on RNA stability in the presence of Formalin, or any other chemical. This property of Argon appears to be specific in that other inert gases fail to show any RNA stabilizing effect.
    Type: Grant
    Filed: August 16, 2013
    Date of Patent: July 25, 2017
    Assignees: American Air Liquide, Inc., The United States of America, as represented by the Secretary, Department of Health and Human Services
    Inventors: Vasuhi Rasanayagam, Sagar D. Joshi, Meenakshi Sundaram, Stephen M. Hewitt, Joon-Yong Chung
  • Patent number: 9243182
    Abstract: The present invention is a cryogenic subterranean fracturing fluid, comprising a liquefied industrial gas and a viscosity increasing additive. The liquefied industrial gas may be liquefied carbon dioxide, liquefied nitrogen, or a blend of the two. The liquefied industrial gas mixture should be substantially free of water. In this context, substantially free of water means less than 10% water by volume, or preferably less than 5% water by volume. In addition to the viscosity increasing additive, a proppant may be added to the fracturing fluid. In addition to the viscosity increasing additive and/or proppant additional additives may be added to the liquefied industrial gas as required.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: January 26, 2016
    Assignees: American Air Liquide Inc., Air Liquide Canada, Inc.
    Inventors: Camille Lanctot-Downs, Michel Epiney, Fabrice Laberge, Vasuhi Rasanayagam, Meenakshi Sundaram
  • Publication number: 20150216161
    Abstract: The invention may be broadly defined as the addition of Argon to FFPE procedures as an RNA stabilizing agent. Argon is an inert gas from the Noble gas group with low saturation concentrations in water. It is therefore highly surprising that Argon would have any effect on RNA stability in the presence of Formalin, or any other chemical. This property of Argon appears to be specific in that other inert gases fail to show any RNA stabilizing effect.
    Type: Application
    Filed: August 16, 2013
    Publication date: August 6, 2015
    Applicant: American Air Liquide, Inc.
    Inventors: Vasuhi Rasanayagam, Sagar D. Joshi, Meenakshi Sundaram, Stephen M. Hewitt, Joon-Yong Chung
  • Patent number: 9034407
    Abstract: Embodiments of the invention generally provide methods and systems that distribute an additive in solid carbon dioxide in an interior of food processing equipment. The additive may be injected into a flow of liquid carbon dioxide upstream of an expander at or adjacent to the interior. Injection of the additive into the interior may be alternated with directing a flow of expanded carbon dioxide into the interior. In some embodiments, the freezing point of the additive with or without a diluent composition and/or additive(s) is lower than a temperature of the liquid carbon dioxide.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: May 19, 2015
    Assignees: American Air Liquide, Inc., Air Liquide Industrial U.S. LP
    Inventors: David C. Braithwaite, Meenakshi Sundaram, Vasuhi Rasanayagam
  • Publication number: 20140220213
    Abstract: Embodiments of the invention generally provide methods and systems that distribute an additive in solid carbon dioxide in an interior of food processing equipment. The additive may be injected into a flow of liquid carbon dioxide upstream of an expander at or adjacent to the interior. Injection of the additive into the interior may be alternated with directing a flow of expanded carbon dioxide into the interior. In some embodiments, the freezing point of the additive with or without a diluent composition and/or additive(s) is lower than a temperature of the liquid carbon dioxide.
    Type: Application
    Filed: April 4, 2014
    Publication date: August 7, 2014
    Applicants: Air Liquide Industrial U.S. L.P., American Air Liquide, Inc.
    Inventors: David C. BRAITHWAITE, Meenakshi SUNDARAM, Vasuhi RASANAYAGAM
  • Publication number: 20140186502
    Abstract: Embodiments of the invention generally provide methods and systems that distribute an additive in solid carbon dioxide in an interior of food processing equipment. The additive may be injected into a flow of liquid carbon dioxide upstream of an expander at or adjacent to the interior. Injection of the additive into the interior may be alternated with directing a flow of expanded carbon dioxide into the interior. In some embodiments, the freezing point of the additive with or without a diluent composition and/or additive(s) is lower than a temperature of the liquid carbon dioxide.
    Type: Application
    Filed: March 7, 2014
    Publication date: July 3, 2014
    Applicants: Air Liquide Industrial U.S. L.P., American Air Liquide, Inc.
    Inventors: David C. BRAITHWAITE, Meenakshi Sundaram, Vasuhi Rasanayagam
  • Patent number: 8691308
    Abstract: Embodiments of the invention generally provide methods and systems that distribute an additive in solid carbon dioxide in an interior of food processing equipment. The additive may be injected into a flow of liquid carbon dioxide upstream of an expander at or adjacent to the interior. Injection of the additive into the interior may be alternated with directing a flow of expanded carbon dioxide into the interior. In some embodiments, the freezing point of the additive with or without a diluent composition and/or additive(s) is lower than a temperature of the liquid carbon dioxide.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: April 8, 2014
    Assignees: American Air Liquide, Inc., Air Liquide Industrial U.S. LP
    Inventors: David C. Braithwaite, Meenakshi Sundaram, Vasuhi Rasanayagam
  • Publication number: 20140057813
    Abstract: The present invention is a cryogenic subterranean fracturing fluid, comprising a liquefied industrial gas and a viscosity increasing additive. The liquefied industrial gas may be liquefied carbon dioxide, liquefied nitrogen, or a blend of the two. The liquefied industrial gas mixture should be substantially free of water. In this context, substantially free of water means less than 10% water by volume, or preferably less than 5% water by volume. In addition to the viscosity increasing additive, a proppant may be added to the fracturing fluid. In addition to the viscosity increasing additive and/or proppant additional additives may be added to the liquefied industrial gas as required.
    Type: Application
    Filed: August 21, 2012
    Publication date: February 27, 2014
    Inventors: Camille Lanctot-Downs, Michel Epiney, Fabrice Laberge, Vasuhi Rasanayagam, Meenakshi Sundaram
  • Publication number: 20130306321
    Abstract: The present invention is a cryogenic subterranean fracturing fluid, comprising a liquefied industrial gas and a first additive. The liquefied industrial gas may be liquefied carbon dioxide, liquefied nitrogen, or a blend of the two. The liquefied industrial gas mixture should be substantially free of water. In this context, substantially free of water means less than 10% water by volume, or preferably less than 5% water by volume. In addition to the first additive, a proppant may be added to the fracturing fluid. In addition to the biocide and/or proppant additional additives may be added to the liquefied industrial gas as required. Non-limiting examples of such additives include ozone, a friction reducer, an acid, a gelling agent, a breaker, a scale inhibitor, a clay stabilizer, a corrosion inhibitor, an iron controller, an oxygen scavenger, a surfactant, a cross-linker, a non-emulsifier, a Ph Adjusting agent, or any combination thereof.
    Type: Application
    Filed: May 17, 2012
    Publication date: November 21, 2013
    Inventors: Camille LANCTOT-DOWNS, Michel EPINEY, Fabrice LABERGE, Vasuhi RASANAYAGAM, Meenakshi SUNDARAM