Patents by Inventor Richard C. Fitzgerald

Richard C. Fitzgerald 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).

  • Superconducting magnet system with supplementary heat pipe refrigeration
    Patent number: 7263841
    Abstract: A superconducting magnet system wherein a cryocooler provides refrigeration to a cryogenic shield for the superconducting magnet and a heat pipe extends from the cryogenic shield to a cryogen vessel for the provision of supplementary refrigeration.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: September 4, 2007
    Assignee: Praxair Technology, Inc.
    Inventors: Bayram Arman, Arun Acharya, Richard C. Fitzgerald, James J. Volk
  • Cryogenic refrigeration system for superconducting devices
    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
  • Low frequency pulse tube system with oil-free drive
    Patent number: 7143587
    Abstract: A pulse tube system for generating refrigeration for uses such as in magnetic resonance imaging systems wherein an oil-free compressor operating at a higher frequency generates pulsing gas which undergoes a frequency reduction and drives the pulse tube system at a more efficient lower frequency.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: December 5, 2006
    Assignee: Praxair Technology, Inc.
    Inventors: Arun Acharya, Bayram Arman, Richard C. Fitzgerald, James J. Volk, John Henri Royal
  • Cryocooler system with frequency modulating mechanical resonator
    Patent number: 6938426
    Abstract: A refrigeration generation system wherein a frequency modulating mechanical resonator is positioned between a pressure wave generator and a cryocooler and serves to reduce the frequency of the oscillating gas emanating from the pressure wave generator so that it more closely comports with a more efficient operating frequency of the cryocooler.
    Type: Grant
    Filed: March 30, 2004
    Date of Patent: September 6, 2005
    Assignee: Praxair Technology, Inc.
    Inventors: Arun Acharya, Bayram Arman, Richard C. Fitzgerald, James Joseph Volk, John Henri Royal, Al-Khalique Shariff Hamilton
  • Gas liquefaction method using natural gas and mixed gas refrigeration
    Publication number: 20040148962
    Abstract: A gas liquefaction method which uses the pressure energy of a natural gas processing system to generate refrigeration for high temperature cooling of a gas, and uses a mixed gas refrigerant fluid to generate refrigeration for low temperature cooling of the gas to produce liquefied product.
    Type: Application
    Filed: November 7, 2003
    Publication date: August 5, 2004
    Inventors: M. Abdul-Aziz Rashad, Richard C. Fitzgerald, Dante Patrick Bonaquist, John B. Saunders, Minish Mahendra Shah
  • Gas liquefaction method using natural gas and mixed gas refrigeration
    Patent number: 6694774
    Abstract: A gas liquefaction method which uses the pressure energy of a natural gas processing system to generate refrigeration for high temperature cooling of a gas, and uses a mixed gas refrigerant fluid to generate refrigeration for low temperature cooling of the gas to produce liquefied product.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: February 24, 2004
    Assignee: Praxair Technology, Inc.
    Inventors: M. Abdul-Aziz Rashad, Richard C. Fitzgerald, Dante Patrick Bonaquist, John B. Saunders, Minish Mahendra Shah