Patents by Inventor Ranajit Ghosh

Ranajit Ghosh 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).

  • Publication number: 20220169549
    Abstract: A method of controlling defects in a glass product produced in a tin bath furnace includes measuring at least one parameter of an atmosphere associated with the tin bath furnace, wherein the parameter is selected from the group consisting of dew point and density, correlating the measured parameter with defects in the glass product, and controlling the measured parameter in a direction corresponding to decreased defects in the glass product by controlling a flow rate of a process gas relative to the furnace wherein the process gas includes one or more of hydrogen and nitrogen.
    Type: Application
    Filed: March 20, 2020
    Publication date: June 2, 2022
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Reed Jacob HENDERSHOT, Liang HE, Michael J. GALLAGHER, Ranajit GHOSH
  • Publication number: 20220008995
    Abstract: A method and system for providing cooling to a part formed using high-temperature additive manufacturing process. Infrared sensors or cameras are used to measure sidewall temperatures and, optionally, top layer temperature. Coolant nozzles provide cooling to the sidewalls of the finished layers and, optionally, to the top layer. The coolant intensity of the coolant nozzles is controlled in order to reduce temperature gradients between layers and/or to maintain temperatures in each layer below preferred maximum temperature.
    Type: Application
    Filed: June 8, 2021
    Publication date: January 13, 2022
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Liang He, Ranajit Ghosh, Mark Kurt Weise
  • Publication number: 20210140865
    Abstract: An apparatus for controlling blending of a gas mixture containing known components, including first, second, and third control valves for controlling the flow of first, second, and third components, respectively, a first gas density sensor to measure the density of a first mixture of the first and second components, a second gas density sensor to measure the density of a second mixture of the first mixture and the third component, and a controller to determine based on data from the first and second gas density sensors the relative compositions of the first, second, and third components in the second mixture, and to control the first, second, and third control valves to obtain a desired relative composition of the first, second, and third components in the second mixture.
    Type: Application
    Filed: January 19, 2021
    Publication date: May 13, 2021
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Liang He, Ranajit Ghosh, Donald James Bowe, Reed Jacob Hendershot
  • Patent number: 10928287
    Abstract: An apparatus for measuring the composition of a gas mixture containing known components, including a first gas density sensor configured and arranged to measure the density of a first mixture made by combining a gaseous first component and a gaseous second component; a second gas density sensor configured and arranged to measure the density of a second mixture made by combining the first mixture with a gaseous third component; and a processor programmed to determined based on data from the first gas density sensor the relative compositions of the first component and the second component in the first mixture, and to determine based on the data from the second gas density sensor the relative compositions of the first mixture and the third component in the second mixture, and thus to determine the relative compositions of the first component, the second component, and the third component in the second mixture.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: February 23, 2021
    Assignee: Air Products and Chemicals, Inc
    Inventors: Liang He, Ranajit Ghosh, Donald James Bowe, Reed Jacob Hendershot
  • Patent number: 10730142
    Abstract: Methods and systems for controlling gas atmospheres in three-dimensional laser printing and weld overlay consolidation operations using metallic powders are provided. In one or more embodiments, such systems and methods comprise a printing chamber or laser weld overlay system, a gas supply system, a feed powder system, and one or more sensors employed to control the printing or welding operation. The methods and systems of the invention employ one or more inert gases having a purity greater than or equal to 99.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: August 4, 2020
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Zbigniew Zurecki, Ranajit Ghosh
  • Publication number: 20200232707
    Abstract: A method and an apparatus for nitriding metal articles, wherein the nitriding potential of the nitriding atmosphere is controlled as a function of the molecular weights of the inlet and outlet gases from the nitriding apparatus, as measured by molecular weight sensors located outside (external to) the furnace chamber.
    Type: Application
    Filed: January 17, 2019
    Publication date: July 23, 2020
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Liang He, Guido Plicht, Ranajit Ghosh, Donald James Bowe
  • Publication number: 20200049605
    Abstract: An apparatus for measuring the composition of a gas mixture containing known components, including a first gas density sensor configured and arranged to measure the density of a first mixture made by combining a gaseous first component and a gaseous second component; a second gas density sensor configured and arranged to measure the density of a second mixture made by combining the first mixture with a gaseous third component; and a processor programmed to determined based on data from the first gas density sensor the relative compositions of the first component and the second component in the first mixture, and to determine based on the data from the second gas density sensor the relative compositions of the first mixture and the third component in the second mixture, and thus to determine the relative compositions of the first component, the second component, and the third component in the second mixture.
    Type: Application
    Filed: August 9, 2018
    Publication date: February 13, 2020
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Liang He, Ranajit Ghosh, Donald James Bowe, Reed Jacob Hendershot
  • Patent number: 9290823
    Abstract: Described herein are a method, an apparatus, and a system for metal processing that improves one or more properties of a sintered metal part by controlling the process conditions of the cooling zone of a continuous furnace using one or more cryogenic fluids. In one aspect, there is provided a method comprising: providing a furnace wherein the metal part is passed therethough on a conveyor belt and comprises a hot zone and a cooling zone wherein the cooling zone has a first temperature; and introducing a cryogenic fluid into the cooling zone where the cryogenic fluid reduces the temperature of the cooling zone to a second temperature, wherein at least a portion of the cryogenic fluid provides a vapor within the cooling zone and cools the metal parts passing therethrough at an accelerated cooling rate.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: March 22, 2016
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Zbigniew Zurecki, Ranajit Ghosh, Lisa Ann Mercando, Xiaoyi He, John Lewis Green, David Scott Nelson
  • Publication number: 20160045981
    Abstract: Methods and systems for controlling gas atmospheres in three-dimensional laser printing and weld overlay consolidation operations using metallic powders are provided. In one or more embodiments, such systems and methods comprise a printing chamber or laser weld overlay system, a gas supply system, a feed powder system, and one or more sensors employed to control the printing or welding operation. The methods and systems of the invention employ one or more inert gases having a purity greater than or equal to 99.
    Type: Application
    Filed: August 10, 2015
    Publication date: February 18, 2016
    Applicant: AIR PRODUCTS AND CHEMICALS, INC.
    Inventors: Zbigniew Zurecki, Ranajit Ghosh
  • Patent number: 9074959
    Abstract: A method of determining the accuracy and repeatability of leak testing instrumentation comprises the following steps: providing a two chamber vessel having an access port and a flow controlling reference orifice associated with each chamber and a third reference orifice communicating between the two chambers, providing a leak testing device and connecting such leak testing device first to one of such ports, pressurizing the associated chamber and, with the associated orifice open, observing and recording the pressure measured by the leak testing device under test as a function of time. The second test repeats this activity with the other chamber and the other orifice. A third test is undertaken with the third orifice open. One of the chambers is smaller and incorporates a smaller orifice and the other chamber is larger and incorporates a larger orifice thus achieving leak testing under different conditions.
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: July 7, 2015
    Assignee: GM Global Technology Operations, LLC
    Inventors: Ranajit Ghosh, Sunil Nandwani, John S. Agapiou, Paul W. Tanis
  • Patent number: 9016076
    Abstract: A fluid spray device system (1) that maintains a resultant fluid discharge, or a material onto which the resultant fluid is discharged, within a predetermined range of a set-point temperature by regulating the flow rate of a throttling gas using a proportional valve (22). The resultant fluid has throttling gas and cryogenic fluid components. Both the throttling gas and cryogenic fluid are preferably supplied from a single tank (11) and the cryogenic fluid supply is pressure-regulated and includes a triaxial delivery hose (33) having a return line with a back-pressure regulator (54).
    Type: Grant
    Filed: August 27, 2008
    Date of Patent: April 28, 2015
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Kevin John Giardiniere, John Lewis Green, Ranajit Ghosh, Daniel James Gibson, Zbigniew Zurecki
  • Patent number: 8935954
    Abstract: A seal testing apparatus includes a clamp assembly which receives, secures and rotates a piston and seal assembly, a mandrel which extends into the seal assembly and supports a guide which carries a spring biased sensing probe or tooth which is oriented along the axis of the mandrel. In another embodiment, the components are the similar except that the probe or tooth is disposed in the mandrel and extends circumferentially. In both embodiments, data from an optical, laser or acoustic sensor is analyzed to determine the integrity of the piston seal. Yet another embodiment includes an arbor which rotates the seal and an adjacent contra-rotating cylinder having a conical mirror. As the seal, arbor and cylinder rotate, light reflected off the mirror and the seal, and returned to the mirror and a sensor provide data which is again analyzed to determine the integrity of the piston seal.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: January 20, 2015
    Assignee: GM Global Technology Operations, LLC
    Inventors: Sunil Nandwani, Ranajit Ghosh, John S. Agapiou
  • Patent number: 8820199
    Abstract: A method and apparatus for discharging a temperature-controlled flow of a resultant fluid (32) containing a throttling gas and cryogenic fluid onto a material (14) for the purpose of maintaining the temperature of the material within a desired temperature range and below the glass transition temperature of the material during machining. Also disclosed is an apparatus and method for deburring or deflashing a machined material by discharging a temperature-controlled flow of a resultant fluid (132) onto a machined material (114) to harden the burrs (134a), then brushing the material (114) to remove the hardened burrs (143a).
    Type: Grant
    Filed: September 20, 2008
    Date of Patent: September 2, 2014
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Ranajit Ghosh, Jeffrey Alan Knopf, Daniel James Gibson, Thomas Mebrahtu, Kevin John Giardiniere
  • Publication number: 20140069179
    Abstract: A seal testing apparatus includes a clamp assembly which receives, secures and rotates a piston and seal assembly, a mandrel which extends into the seal assembly and supports a guide which carries a spring biased sensing probe or tooth which is oriented along the axis of the mandrel. In another embodiment, the components are the similar except that the probe or tooth is disposed in the mandrel and extends circumferentially. In both embodiments, data from an optical, laser or acoustic sensor is analyzed to determine the integrity of the piston seal. Yet another embodiment includes an arbor which rotates the seal and an adjacent contra-rotating cylinder having a conical mirror. As the seal, arbor and cylinder rotate, light reflected off the mirror and the seal, and returned to the mirror and a sensor provide data which is again analyzed to determine the integrity of the piston seal.
    Type: Application
    Filed: September 12, 2012
    Publication date: March 13, 2014
    Applicant: GM Global Technology Operaions LLC
    Inventors: Sunil Nandwani, Ranajit Ghosh, John S. Agapiou
  • Publication number: 20140053636
    Abstract: A method of determining the accuracy and repeatability of leak testing instrumentation comprises the following steps: providing a two chamber vessel having an access port and a flow controlling reference orifice associated with each chamber and a third reference orifice communicating between the two chambers, providing a leak testing device and connecting such leak testing device first to one of such ports, pressurizing the associated chamber and, with the associated orifice open, observing and recording the pressure measured by the leak testing device under test as a function of time. The second test repeats this activity with the other chamber and the other orifice. A third test is undertaken with the third orifice open. One of the chambers is smaller and incorporates a smaller orifice and the other chamber is larger and incorporates a larger orifice thus achieving leak testing under different conditions.
    Type: Application
    Filed: August 24, 2012
    Publication date: February 27, 2014
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Ranajit Ghosh, Sunil Nandwani, John S. Agapiou, Paul W. Tanis
  • Patent number: 8579182
    Abstract: Described herein is an apparatus and method for providing an inerting gas during the application of soldering to a work piece. In one aspect, there is provided an enclosure for providing an inerting gas into an atmosphere above a solder reservoir during soldering of a work piece comprising: a tube in fluid communication with an inerting gas source wherein the tube comprises one or more openings for the flow of the inerting gas therethrough, a base wherein the tube resides in therein and comprises an interior volume, a neck comprising an opening and an interior volume in fluid communication with the interior volume of the base, and a cap proximal to the opening wherein the inerting gas source travels through the tube into the interior volume and into the atmosphere through the opening defined by the neck and cap.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: November 12, 2013
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Chun Christine Dong, Victor Wang, Jerry Wu, Ranajit Ghosh, Gregory Khosrov Arslanian
  • Patent number: 8454850
    Abstract: Described herein are a method and an apparatus for removing metal oxides and/or forming solder joints on at least a portion of a substrate surface within a target area. In one particular embodiment, the method and apparatus form a solder joint within a substrate comprising a layer having a plurality of solder bumps by providing one or more energizing electrodes and exposing at least a portion of the layer and solder bumps to the energizing electrode.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: June 4, 2013
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Chun Christine Dong, Ranajit Ghosh, Gregory Khosrov Arslanian
  • Publication number: 20130098974
    Abstract: Described herein is an apparatus and method for providing an inerting gas during the application of soldering to a work piece. In one aspect, there is provided an enclosure for providing an inerting gas into an atmosphere above a solder reservoir during soldering of a work piece comprising: a tube in fluid communication with an inerting gas source wherein the tube comprises one or more openings for the flow of the inerting gas therethrough, a base wherein the tube resides in therein and comprises an interior volume, a neck comprising an opening and an interior volume in fluid communication with the interior volume of the base, and a cap proximal to the opening wherein the inerting gas source travels through the tube into the interior volume and into the atmosphere through the opening defined by the neck and cap.
    Type: Application
    Filed: April 18, 2012
    Publication date: April 25, 2013
    Applicant: AIR PRODUCTS AND CHEMICALS, INC.
    Inventors: Chun Christine Dong, Victor Wang, Jerry Wu, Ranajit Ghosh, Gregory Khosrov Arslanian
  • Patent number: 8361340
    Abstract: Described herein are a method and an apparatus for removing metal oxides from a substrate surface within a target area. In one particular embodiment, the method and apparatus has an energizing electrode which has an array of protruding conductive tips that are electrically connected by a conductive wire and separated into a first electrically connected group and a second electrically connected group wherein at least a portion of the conductive tips are activated by a DC voltage source that is negatively biased to generate electrons within the target area that attach to at least a portion of a reducing gas that is present in the target area to form a negatively charged reducing gas that contacts the treating surface to reduce the metal oxides on the treating surface of the substrate.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: January 29, 2013
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Chun Christine Dong, Richard E. Patrick, Gregory Khosrov Arslanian, Ranajit Ghosh
  • Patent number: 8220370
    Abstract: An apparatus and a method are disclosed for reducing a thickness of a thermomechanically-affected layer on an as-machined surface of a hard metal workpiece being machined by a hard cutting tool exerting a thermomechanical load on a surface of the workpiece. The method involves reducing the thermomechanical load on the surface of the workpiece, and the apparatus includes a means for reducing the thermomechanical load on the surface of the workpiece.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: July 17, 2012
    Assignee: Air Products & Chemicals, Inc.
    Inventors: Zbigniew Zurecki, Ranajit Ghosh, John Herbert Frey, James Bryan Taylor