Patents by Inventor M. Mushtaq Ahmed

M. Mushtaq Ahmed 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: 8235364
    Abstract: This invention relates to a vapor or liquid phase reagent dispensing apparatus that may be used for dispensing vapor or liquid phase reagents such as precursors for deposition of materials in the manufacture of semiconductor materials and devices. The vapor phase reagent dispensing apparatus has a single port capable of receiving a carrier gas and dispensing a vapor phase reagent. The liquid phase reagent dispensing apparatus has a single port capable of receiving an inert gas and dispensing a liquid phase reagent.
    Type: Grant
    Filed: November 4, 2009
    Date of Patent: August 7, 2012
    Assignee: Praxair Technology, Inc.
    Inventors: Demetrius Sarigiannis, M. Mushtaq Ahmed
  • Publication number: 20100117246
    Abstract: This invention relates to a vapor or liquid phase reagent dispensing apparatus that may be used for dispensing vapor or liquid phase reagents such as precursors for deposition of materials in the manufacture of semiconductor materials and devices. The vapor phase reagent dispensing apparatus has a single port capable of receiving a carrier gas and dispensing a vapor phase reagent. The liquid phase reagent dispensing apparatus has a single port capable of receiving an inert gas and dispensing a liquid phase reagent.
    Type: Application
    Filed: November 4, 2009
    Publication date: May 13, 2010
    Inventors: Demetrius Sarigiannis, M. Mushtaq Ahmed
  • Patent number: 7549400
    Abstract: A method of heating process streams fed to a boiler incorporating an oxygen transport membrane device that includes an oxygen-containing stream and a boiler feed water stream. The membrane device separates oxygen to support combustion of a fuel and generate heat to raise the steam. Heat is recovered and process streams are heated by separately heating portions of the oxygen-containing stream and the boiler feed water stream with a retentate stream produced from the oxygen separation and a flue gas stream generated from the combustion. The flow rate of the portion of the oxygen-containing stream heated by the retentate stream is greater than that heated by the flue gas stream to help minimize heat transfer area and thus, fabrication costs. Also, water is condensed from the flue gas stream during the heat exchange involved in the heat recovery to increase thermodynamic efficiency.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: June 23, 2009
    Assignee: Praxair Technology, Inc.
    Inventors: Vijayaraghavan Srinivasan Chakravarthy, Bart A. van Hassel, M. Mushtaq Ahmed
  • Patent number: 7487648
    Abstract: A method for the cryogenic separation of air having defined temperatures for condensed feed air passed into a double column system relative to liquid oxygen and preferably to shelf vapor, and wherein kettle liquid is not subcooled from the higher pressure column to the lower pressure column.
    Type: Grant
    Filed: March 10, 2006
    Date of Patent: February 10, 2009
    Assignee: Praxair Technology, Inc.
    Inventors: Joseph Alfred Weber, M. Mushtaq Ahmed, Todd Alan Skare, Neil Mark Prosser
  • Publication number: 20080221807
    Abstract: Monitoring pressurized fluid containers through use of a container site subsystem and a system hub. The container site subsystem including sensor(s) to sense a characteristic associated with a pressurized fluid container; and a container site hub to receive, from each sensor, raw data corresponding to the sensed characteristic. The system hub receives the aggregated raw data from the container site hub, and converts the raw data to process values.
    Type: Application
    Filed: March 3, 2008
    Publication date: September 11, 2008
    Inventors: Kevin D. Dix, David Elston Brown, Christopher A. Lauff, Fang Huang Tu, M. Mushtaq Ahmed, Steven James Borkman
  • Publication number: 20080221809
    Abstract: Monitoring pressurized fluid containers through use of a container site subsystem and a system hub. The container site subsystem including sensor(s) to sense a characteristic associated with a pressurized fluid container; and a container site hub to receive, from each sensor, raw data corresponding to the sensed characteristic. The system hub receives the aggregated raw data from the container site hub, and converts the raw data to process values.
    Type: Application
    Filed: March 3, 2008
    Publication date: September 11, 2008
    Inventors: Kevin D. Dix, David Elston Brown, Christopher A. Lauff, Fang Huang Tu, M. Mushtaq Ahmed, Steven James Borkman
  • Publication number: 20080221808
    Abstract: Monitoring pressurized fluid containers through use of a container site subsystem and a system hub. The container site subsystem including sensor(s) to sense a characteristic associated with a pressurized fluid container; and a container site hub to receive, from each sensor, raw data corresponding to the sensed characteristic. The system hub receives the aggregated raw data from the container site hub, and converts the raw data to process values.
    Type: Application
    Filed: March 3, 2008
    Publication date: September 11, 2008
    Inventors: Kevin D. Dix, David Elston Brown, Christopher A. Lauff, Fang Huang Tu, M. Mushtaq Ahmed, Steven James Borkman
  • Patent number: 7384452
    Abstract: A method of heating a fluid utilizing a process heater having one or more first combustion zones and one or more second combustion zones. The combustion of a fuel is divided between the first and second combustion zones. The oxygen is provided for combustion within the first combustion zone by one or more oxygen transport membranes that contribute between about 50 and 99 percent of the stoichiometric amount of oxygen required for complete combustion of the fuel passing through the process heater. A supplemental or secondary oxidant is introduced into second combustion zone to complete combustion of the fuel and thereby produce a flue gas stream containing between about 1 and 3 percent oxygen to ensure complete combustion of the fuel. In this manner, the surface area of the oxygen transport membranes may be reduced below the surface area that otherwise would be required if 100 percent of the oxygen were contributed by the oxygen transport membranes.
    Type: Grant
    Filed: December 9, 2005
    Date of Patent: June 10, 2008
    Assignee: Praxair Technology, Inc.
    Inventors: John Sirman, Leonard H. Switzer, Bart Antonie van Hassel, M. Mushtaq Ahmed
  • Publication number: 20080127911
    Abstract: A method of heating process streams fed to a boiler incorporating an oxygen transport membrane device that includes an oxygen-containing stream and a boiler feed water stream. The membrane device separates oxygen to support combustion of a fuel and generate heat to raise the steam. Heat is recovered and process streams are heated by separately heating portions of the oxygen-containing stream and the boiler feed water stream with a retentate stream produced from the oxygen separation and a flue gas stream generated from the combustion. The flow rate of the portion of the oxygen-containing stream heated by the retentate stream is greater than that heated by the flue gas stream to help minimize heat transfer area and thus, fabrication costs. Also, water is condensed from the flue gas stream during the heat exchange involved in the heat recovery to increase thermodynamic efficiency.
    Type: Application
    Filed: December 5, 2006
    Publication date: June 5, 2008
    Inventors: Vijayaraghavan Srinivasan Chakravarthy, Bart A. van Hassel, M. Mushtaq Ahmed
  • Patent number: 7228686
    Abstract: A system for cooling one or more discrete superconducting devices wherein a primary refrigerator subcools cryogenic liquid for desubcooling in the devices and subsequently resubcools this liquid in a recirculation loop, and additional cryogenic liquid is maintained in a subcooled condition within a reserve storage container by diversion of some of the refrigeration generated by the primary refrigerator into the reserve storage container.
    Type: Grant
    Filed: July 26, 2005
    Date of Patent: June 12, 2007
    Assignee: Praxair Technology, Inc.
    Inventors: John Henri Royal, Richard C. Fitzgerald, Norm Henry White, Jalal Hunain Zia, M. Mushtaq Ahmed
  • Patent number: 7096672
    Abstract: A method of heating a fluid in a fluid heater integrated with a gas turbine. Fuel is burned in a radiant section of the fluid heater to heat the fluid and to produce combustion gases for the heating a downstream convective section. The combustion is supported by a combined oxidant stream. An oxygen containing stream or the combined stream, which is made up in part by the oxygen containing stream is preheated through indirect heat transfer with a first gas turbine exhaust stream produced by the gas turbine. A second gas turbine exhaust stream, also produced by the gas turbine is combined with the oxygen containing stream to form the combined oxidant stream. As such, the available heat energy supplied to the fluid heater is supplied not only by the combustion but also the gas turbine. This allows for the fuel to be conserved or for increased fluid throughput.
    Type: Grant
    Filed: March 16, 2006
    Date of Patent: August 29, 2006
    Assignee: Praxair Technology, Inc.
    Inventors: M. Mushtaq Ahmed, Raymond Francis Drnevich
  • Patent number: 7076957
    Abstract: A method of heating a fluid in a fluid heater integrated with a gas turbine. Fuel is burned in a radiant section of the fluid heater to heat the fluid and to produce combustion gases for the heating a downstream convective section. The combustion is supported by a combined oxidant stream. An oxygen containing stream or the combined stream, which is made up in part by the oxygen containing stream is preheated through indirect heat transfer with a first gas turbine exhaust stream produced by the gas turbine. A second gas turbine exhaust stream, also produced by the gas turbine is combined with the oxygen containing stream to form the combined oxidant stream. As such, the available heat energy supplied to the fluid heater is supplied not only by the combustion but also the gas turbine. This allows for the fuel to be conserved or for increased fluid throughput.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: July 18, 2006
    Assignee: Praxair Technology, Inc.
    Inventors: M. Mushtaq Ahmed, Raymond Francis Drnevich
  • Patent number: 7043923
    Abstract: A method of heating a fluid in a fluid heater integrated with a gas turbine. Fuel is burned in a radiant section of the fluid heater to heat the fluid and to produce combustion gases for the heating a downstream convective section. The combustion is supported by a combined oxidant stream. An oxygen containing stream or the combined stream, which is made up in part by the oxygen containing stream is preheated through indirect heat transfer with a first gas turbine exhaust stream produced by the gas turbine. A second gas turbine exhaust stream, also produced by the gas turbine is combined with the oxygen containing stream to form the combined oxidant stream. As such, the available heat energy supplied to the fluid heater is supplied not only by the combustion but also the gas turbine. This allows for the fuel to be conserved or for increased fluid throughput.
    Type: Grant
    Filed: December 1, 2005
    Date of Patent: May 16, 2006
    Assignee: Praxair Technology, Inc.
    Inventors: M. Mushtaq Ahmed, Raymond Francis Drnevich
  • Patent number: 7024867
    Abstract: A method for operating a cryocooler which provides opportunity for timely intervention prior to failure thus enhancing the reliability of the provision of the refrigeration wherein contaminant concentration downstream of a compressor but upstream of the cryocooler is monitored and the time rate of change of the contaminant concentration is used to calculate a service time.
    Type: Grant
    Filed: May 18, 2004
    Date of Patent: April 11, 2006
    Assignee: Praxair Technology, Inc.
    Inventors: Bayram Arman, James J. Volk, Steve A. Richards, M. Mushtaq Ahmed, Arun Acharya
  • Patent number: 6667409
    Abstract: An integrated process and apparatus for integrating an alkene derivative process, such as ethylene oxide process, with an ethylene process so that any ethylene entrapped in the purge stream of the alkene derivative process can be effectively recovered through the ethylene process portion of the integrated process.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: December 23, 2003
    Assignee: Praxair Technology, Inc.
    Inventors: Minish Mahendra Shah, M. Mushtaq Ahmed, Raymond Francis Drnevich
  • Patent number: 6604367
    Abstract: A system for providing refrigeration to a chemical processing operation wherein a refrigerant fluid is compressed and cooled, and a portion turboexpanded prior to being passed to a chemical processing operation for direct contact or indirect heat exchange.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: August 12, 2003
    Assignee: Praxair Technology, Inc.
    Inventors: M. Mushtaq Ahmed, Theodore Fringelin Fisher
  • Publication number: 20030110782
    Abstract: A system for providing refrigeration to a chemical processing operation wherein a refrigerant fluid is compressed and cooled, and a portion turboexpanded prior to being passed to a chemical processing operation for direct contact or indirect heat exchange.
    Type: Application
    Filed: December 19, 2001
    Publication date: June 19, 2003
    Inventors: M. Mushtaq. Ahmed, Theodore Fringelin Fisher
  • Publication number: 20030060642
    Abstract: An integrated process and apparatus for integrating an alkene derivative process, such as ethylene oxide process, with an ethylene process so that any ethylene entrapped in the purge stream of the alkene derivative process can be effectively recovered through the ethylene process portion of the integrated process.
    Type: Application
    Filed: September 27, 2001
    Publication date: March 27, 2003
    Inventors: Minish Mahendra Shah, M. Mushtaq Ahmed, Raymond Francis Drnevich
  • Patent number: 6415628
    Abstract: A method and apparatus for providing direct contact refrigeration to a heat source wherein refrigeration is generated using a recirculating defined multicomponent refrigerant fluid, and transferred to a direct contact refrigerant fluid which directly contacts the heat source.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: July 9, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: M. Mushtaq Ahmed, Theodore Fringelin Fisher
  • Patent number: 6343462
    Abstract: A method and apparatus for increasing power output and efficiency of gas turbines. Power output is enhanced and NOx emissions are lowered while heat rate penalties are minimized by adding nitrogen or a mixture of nitrogen and water vapor to the gas turbine in conjunction with the use of low pressure steam.
    Type: Grant
    Filed: November 13, 1998
    Date of Patent: February 5, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Raymond Francis Drnevich, M. Mushtaq Ahmed