Patents Represented by Attorney, Agent or Law Firm Stanley Ktorides
  • Method for providing refrigeration using a turboexpander cycle
    Patent number: 6438994
    Abstract: A method for generating refrigeration using a turboexpander or reverse Brayton cycle which can more efficiently generate refrigeration especially to cryogenic temperatures using a defined refrigerant mixture containing argon and/or nitrogen.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: August 27, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Mohammad Abdul-Aziz Rashad, Kenneth Kai Wong, Henry Edward Howard, Dante Patrick Bonaquist, Bayram Arman
  • Metal refining method using differing refining oxygen sequence
    Patent number: 6432163
    Abstract: A metal refining method particularly useful with a basic oxygen steelmaking process, wherein during an initial period, refining oxygen is provided into the furnace headspace surrounded by a shroud comprising oxygen and inert gas, and during a subsequent period refining oxygen is provided into the furnace headspace surrounded by a flame shroud.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: August 13, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Balu Sarma, Ronald Joseph Selines, John Erling Anderson, William John Mahoney
  • Cryogenic vessel system with pulse tube refrigeration
    Patent number: 6430938
    Abstract: A cryogenic vessel system for containing cryogenic fluid wherein heat leak into the vessel interior is counteracted by refrigeration generated from energy provided by a pulse generator.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: August 13, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: John Henri Royal, Christian Friedrich Gottzmann, Arun Acharya, Gary D. Lang
  • Cryogenic industrial gas refrigeration system
    Patent number: 6427483
    Abstract: A method and apparatus for refrigerating and, if desired, liquefying an industrial gas wherein a multicomponent refrigerant fluid is used to generate refrigeration in a single circuit which includes a single phase separation and recycle after an initial heat exchange stage.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: August 6, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Mohammad Abdul-Aziz Rashad, Bayram Arman, Arun Acharya
  • Variable load refrigeration system particularly for cryogenic temperatures
    Patent number: 6426019
    Abstract: A method for generating refrigeration, especially over a wide temperature range including cryogenic temperatures, wherein a non-toxic, non-flammable and low or non-ozone-depleting mixture is formed from defined components and maintained in variable load form through compression, cooling, expansion and warming steps in a refrigeration cycle.
    Type: Grant
    Filed: April 7, 2000
    Date of Patent: July 30, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Arun Acharya, Bayram Arman, Walter Joseph Olszewski, Dante Patrick Bonaquist, Joseph Alfred Weber
  • Cryogenic refrigeration system
    Patent number: 6425264
    Abstract: A cryogenic refrigeration system wherein refrigeration is provided to a heat load by a warming multicomponent refrigerant fluid recirculating in a refrigeration circuit and by cryogenic liquid separately provided to the heat load in direct or indirect heat exchange with the heat load.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: July 30, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Kenneth Kai Wong, Richard A. Novak, Michael John Sinicropi, Dante Patrick Bonaquist
  • System for providing cryogenic refrigeration using an upstream pulse tube refrigerator
    Patent number: 6425250
    Abstract: A system for providing refrigeration to a heat load, especially over a larger temperature range and at a cryogenic temperature, wherein pulse tube refrigeration cools a heat transfer medium to provide higher level refrigeration to a refrigeration fluid, and lower level refrigeration is provided to the refrigeration fluid using a non-pulse tube system.
    Type: Grant
    Filed: February 8, 2001
    Date of Patent: July 30, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Arun Acharya, John H. Royal, Dante P. Bonaquist, Bayram Arman, Christian F. Gottzmann
  • System for providing direct contact refrigeration
    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
  • Cryogenic refrigeration system using magnetic refrigerator forecooling
    Patent number: 6415611
    Abstract: A system for providing refrigeration to a heat load, especially over a larger temperature range and at a cryogenic temperature, wherein magnetic refrigeration cools a heat transfer medium to provide higher level refrigeration to a refrigeration fluid, and lower level refrigeration is provided to the fluid using a nonmagnetic system.
    Type: Grant
    Filed: February 22, 2001
    Date of Patent: July 9, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Arun Acharya, Bayram Arman, Dante Patrick Bonaquist
  • Quadrilateral assembly for coherent jet lancing and post combustion in an electric arc furnace
    Patent number: 6400747
    Abstract: A quadrilateral assembly in an electric arc furnace wall for providing one or more coherent jets into the furnace and for providing preferably a plurality of post combustion oxidant streams into the furnace, preferably for forming a post combustion oxidant sheet.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: June 4, 2002
    Assignee: Praxair Technology, Inc.
    Inventor: Pravin Chandra Mathur
  • Gryogenic rectification method for increased argon production
    Patent number: 6397632
    Abstract: A cryogenic rectification method for increasing the recovery of argon produced in an argon column of a cryogenic air separation plant wherein liquid nitrogen is mixed with higher pressure column kettle liquid to produce a liquid refrigeration mixture to drive the top condenser.
    Type: Grant
    Filed: July 11, 2001
    Date of Patent: June 4, 2002
    Assignee: Praxair Technology, Inc.
    Inventor: James Patrick Meagher
  • Cryogenic condensation and vaporization system
    Patent number: 6393866
    Abstract: A system, especially useful under cryogenic conditions, for downflowing cocurrent condensation of vapor against downflowing partially vaporizing liquid, wherein the condensing vapor flows within tubes having fluted internal surfaces and the boiling liquid flows along the outer surfaces of the tubes having re-entrant cavities.
    Type: Grant
    Filed: May 22, 2001
    Date of Patent: May 28, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Vijayaraghavan Srinivasan, Michael James Lockett
  • Supersonic coherent gas jet for providing gas into a liquid
    Patent number: 6383445
    Abstract: A system for establishing and maintaining a supersonic coherent gas jet, effective with either an oxidizing or an inert gas, employing a converging/diverging nozzle for establishment of a non-disruptive initial supersonic velocity, and a slower moving defined triple layered flame envelope coaxial with the jet for effective maintenance of the supersonic velocity. The invention is particularly useful for providing gas into a pool of liquid.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: May 7, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: John Erling Anderson, Pravin Chandra Mathur
  • Packing with low contacting crimp pattern
    Patent number: 6378332
    Abstract: A corrugated structured packing for forming into modules for use in a rectification column, having both high and low corrugations which reduce the contact points when formed into modules, serving to improve mass transfer effectiveness and thus reduce the requisite column height.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: April 30, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: John Fredric Billingham, Michael James Lockett
  • Cryogenic system for producing xenon employing a xenon concentrator column
    Patent number: 6378333
    Abstract: A system for producing xenon concentrate suitable for further refining wherein a xenon concentrator column processes liquid from the sump of a lower pressure column and additionally produces oxygen gas for recovery or recycle to the lower pressure column.
    Type: Grant
    Filed: February 16, 2001
    Date of Patent: April 30, 2002
    Assignee: Praxair Technology, Inc.
    Inventor: James Robert Dray
  • Cryogenic pulse tube system
    Patent number: 6374617
    Abstract: A pulse tube system especially useful for producing and delivering refrigeration at very cold temperatures wherein a product fluid such as hydrogen is preferably precooled and then liquefied, subcooled and/or densified by heat exchange with ultra cold gas generated by a pulsing compression wave which rejects heat into a cryogen fluid heat sink.
    Type: Grant
    Filed: January 19, 2001
    Date of Patent: April 23, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Dante Patrick Bonaquist, Bayram Arman, Nancy Jean Lynch, Arun Acharya
  • Cryogenic air separation system with integrated booster and multicomponent refrigeration compression
    Patent number: 6357258
    Abstract: A cryogenic air separation system wherein pressure energy is supplied by a bridge machine having one or more booster compressors and a multicomponent refrigerant fluid compressor of a multicomponent refrigerant fluid circuit, all of the compressors of the bridge machine driven by power supplied through a single gear case.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: March 19, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Kevin William Mahoney, Dante Patrick Bonaquist
  • Cryogenic industrial gas liquefaction with azeotropic fluid forecooling
    Patent number: 6357257
    Abstract: An industrial gas liquefaction cycle employing a main refrigeration circuit to supply low level refrigeration to the industrial gas, and a forecooling circuit employing an azeotropic mixture to provide high level refrigeration to the refrigerant fluid recirculating within the main refrigeration circuit.
    Type: Grant
    Filed: January 25, 2001
    Date of Patent: March 19, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Vance Goble, Jr., Arun Acharya, Bayram Arman
  • Cryogenic nitrogen production system using a single brazement
    Patent number: 6351969
    Abstract: A cryogenic nitrogen production plant wherein all the heat transfer steps, and preferably all the heat transfer and separation steps, are carried out in a brazement which receives feed air and from which is recovered product nitrogen.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: March 5, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Bayram Arman, Dante Patrick Bonaquist, Tu Cam Nguyen
  • System for operating cryogenic liquid tankage
    Patent number: 6336331
    Abstract: A system wherein flashoff losses from cryogenic liquid tankage are reduced wherein fluid from the tankage is condensed and subcooled against refrigeration bearing refrigerant fluid generated by an exogenous refrigeration system.
    Type: Grant
    Filed: August 1, 2000
    Date of Patent: January 8, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Norman Henry White, Kenneth Kai Wong, William Martin Greene, III, Dante Patrick Bonaquist, Arun Acharya, Bayram Arman