Patents Represented by Attorney Alvin H. Fritschler

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  • Gas dispersion apparatus for molten aluminum refining
    Patent number: 5234202
    Abstract: The maximum useful rate of aluminum refining is substantially increased by the incorporation of baffle means across the refining chamber under the rotor of a spinning nozzle assembly positioned in the refining chamber during aluminum refining operations.
    Type: Grant
    Filed: February 19, 1991
    Date of Patent: August 10, 1993
    Assignee: Praxair Technology, Inc.
    Inventor: John F. Pelton
  • Liquefier process
    Patent number: 5231835
    Abstract: Dual turbine-booster compressor units are arranged for advantageous liquefaction operations using high pressure heat exchangers.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: August 3, 1993
    Assignee: Praxair Technology, Inc.
    Inventors: Robert A. Beddome, Joseph A. Weber
  • Oxygen-permeable polymeric membranes
    Patent number: 5229465
    Abstract: Oxygen-permeable polymeric membranes, intended for use in processes for producing oxygen- or nitrogen-enriched air for industrial, medical, and other applications, are characterized by a complex which comprises (a) a copolymer of a vinyl aromatic amine and either (i) a fluoroalkyl acrylate or (ii) a fluoroalkyl methacrylate, and (b) a ligand taken from the group consisting of (1) porphyrins, (2) Schiff bases, (3) cyclidenes, and (4) amine-like macrocycles, and (c) a transition metal (II) ion.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: July 20, 1993
    Assignee: Praxair Technology, Inc.
    Inventors: Eishun Tsuchida, Hiroyuki Nishide, Hiroyoshi Kawakami
  • Enhanced meambrane gas separations
    Patent number: 5226932
    Abstract: Highly efficient membrane drying and other gas separations are carried out by the use of low vacuum levels on the permeate side of the membrane.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: July 13, 1993
    Assignee: Praxair Technology, Inc.
    Inventor: Ravi Prasad
  • Calibration for ultra high purity gas analysis
    Patent number: 5214952
    Abstract: A calibration device utilizing a series of highly accurate mass flow controllers is provided for rapidly delivering ultra high purity calibration gas mixtures, and sample gas, to a gas analyzer at elevated temperature conditions. Steady flow rates are desirably provided to the highly sensitive analyzer. Valves exterior (20-25) and interior (3-5) to the heated compartment (9), heated by temperature controlled heater strips (9a), control the mixing of the reference gases with the sample gas and/or the flow of sample or calibration gas to the analyzer (16). The interior valves are diaphragm valves.
    Type: Grant
    Filed: August 16, 1991
    Date of Patent: June 1, 1993
    Assignee: Praxair Technology, Inc.
    Inventors: Gregory H. Leggett, Michael H. Sonricker
  • Stripping system
    Patent number: 5211916
    Abstract: An in-line stripper has a venturi-conical mixer combination in which the annular space thereby is automatically adjustable in response to changes in viscosity or other property conditions.
    Type: Grant
    Filed: December 24, 1991
    Date of Patent: May 18, 1993
    Assignee: Praxair Technology, Inc.
    Inventor: Alan T. Cheng
  • Dual product pressure swing adsorption and membrane operations
    Patent number: 5207806
    Abstract: The waste gas of PSA-air separation operations is passed to a membrane system for enhanced recovery of a second product. By capturing the portion found to contain a high concentration of either nitrogen or oxygen in the waste stream, the efficiency of the overall separation is enhanced.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: May 4, 1993
    Assignee: Praxair Technology, Inc.
    Inventors: Dale A. Lagree, David R. Thompson
  • Adsorbent beds for pressure swing adsorption operations
    Patent number: 5203887
    Abstract: Composite adsorbent beds comprised of conventional 13X adsorbent and special cation exchanged adsorbent materials enable vacuum pressure swing adsorption operations for air separation to be carried out at advantageously low oxygen or nitrogen product costs.
    Type: Grant
    Filed: December 11, 1991
    Date of Patent: April 20, 1993
    Assignee: Praxair Technology, Inc.
    Inventor: Lee J. Toussaint
  • Waste treatment oxidation operations
    Patent number: 5200080
    Abstract: Bioremediation or other liquid waste biotreatment operations are enhanced by the use of turbulence promoters to create turbulent flow conditions in an oxygen/liquid waste dispersion prior to passage in an improved gas/liquid distribution system for passage through eductors into a lagoon or other holding source of the liquid waste being treated.
    Type: Grant
    Filed: October 2, 1991
    Date of Patent: April 6, 1993
    Assignee: Praxair Technology, Inc.
    Inventors: Thomas J. Bergman, Jr., Lawrence M. Litz
  • Gas dispersion apparatus with rotor and stator for molten aluminum refining
    Patent number: 5198180
    Abstract: The maximum useful rate of aluminum refining is substantially increased by the incorporation of baffle means across the refining chamber under the rotor of a spinning nozzle assembly positioned in the refining chamber during aluminum refining operations.
    Type: Grant
    Filed: March 3, 1992
    Date of Patent: March 30, 1993
    Assignee: Praxair Technology, Inc.
    Inventor: John F. Pelton
  • Membrane oxygen process and system
    Patent number: 5185014
    Abstract: A two stage membrane system is used for the production of oxygen from air. All or a portion of the feed air is passed to the permeate side of the second stage membrane as purge gas. The gas withdrawn from the permeate side of the second stage membrane is passed as feed gas to the first stage membrane, from which product oxygen is recovered.
    Type: Grant
    Filed: November 5, 1991
    Date of Patent: February 9, 1993
    Assignee: Praxair Technology, Inc.
    Inventor: Ravi Prasad
  • Hollow fiber membranes
    Patent number: 5181940
    Abstract: A process for producing highly asymmetric hollow fibers useful as permselective gas separation membranes and for producing composite membranes thereof by extruding the spinning dope through a tube-in-orifice spinneret into a gas-filled chamber maintained at reduced pressure and then conveying the extruded hollow fiber through a liquid bath to solidify the extrudate.
    Type: Grant
    Filed: August 1, 1991
    Date of Patent: January 26, 1993
    Assignee: Union Carbide Industrial Gases Technology Corporation
    Inventors: Benjamin Bikson, James T. Macheras, Joyce K. Nelson
  • Low temperature pressure swing adsorption with refrigeration
    Patent number: 5169413
    Abstract: Pressure swing adsorption gas separation operations are enhanced by the retention and use of internal refrigeration effects, without the need for externally supplied refrigeration.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: December 8, 1992
    Assignee: Praxair Technology Inc.
    Inventor: Frederick W. Leavitt
  • Membrane air drying and separation operations
    Patent number: 5169412
    Abstract: Clean, dry air and nitrogen product gas are produced in an integrated system including an air separation membrane system and a membrane dryer operated with a significant degree of countercurrency of performance. Waste or recycle streams from the air separation membrane are used as purge in the membrane dryer.
    Type: Grant
    Filed: November 20, 1991
    Date of Patent: December 8, 1992
    Assignee: Praxair Technology Inc.
    Inventors: Ravi Prasad, Frank Notaro
  • Gas delivery panels
    Patent number: 5163475
    Abstract: A micropanel for the delivery of gas from a supply cylinder to a tool location comprises an arrangement of valves, pressure regulator and associated components adapted to enhance the purity of the delivered gas and the safety of the gas delivery panel.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: November 17, 1992
    Assignee: Praxair Technology, Inc.
    Inventor: Roger J. Gregoire
  • Dual product pressure swing adsorption process and system
    Patent number: 5163978
    Abstract: By capturing the portion found to contain a high concentration of either oxygen or nitrogen in the non-primary waste stream from a PSA-air separation operation, a high purity second product stream can be obtained.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: November 17, 1992
    Assignee: Praxair Technology, Inc.
    Inventors: Frederick W. Leavitt, James Smolarek, Dale A. Lagree
  • Double ended hollow fiber bundle and fluids separation apparatus
    Patent number: 5160042
    Abstract: An annular double ended hollow fiber bundle, a fluid separation apparatus comprising the annular double ended hollow fiber bundle having bores open at both ends of the hollow fibers embedded in the two tubesheets enclosed in a shell having multiple ports, a fluid entrance port, a non-permeate exit port and at least one permeate exit port, wherein said double ended hollow fiber bundle is encased in an essentially impermeable film barrier except for entrance regions situated in selected areas between the tubesheets and to processes for separating fluids mixtures.
    Type: Grant
    Filed: November 5, 1991
    Date of Patent: November 3, 1992
    Assignee: Praxair Technology, Inc.
    Inventors: Benjamin Bikson, Salvatore Giglia
  • Oxygen-permeable polymeric membranes
    Patent number: 5147424
    Abstract: Oxygen-permeable polymeric complexes comprise (a) a transition metal (II) ion, (b) a liqand of meso-tris(.alpha., .alpha.,.alpha.-o-substituted-amidophenyl)-mono-(.beta.-o-substituted amidophenyl) porphyrinato, and (c) an aromatic amine polymer.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: September 15, 1992
    Assignee: Union Carbide Industrial Gases Technology Corporation
    Inventors: Eishun Tsuchida, Hiroyuki Nishide, Hiroyoshi Kawakami
  • Reactive treatment of composite gas separation membranes
    Patent number: 5131927
    Abstract: This invention relates to methods for producing composite gas separation membranes by treating the gas separation layer of the composite membranes with a treating agent that ionically bonds to the gas separation membrane layer of the treated composite membrane. The invention also relates to the membranes produced and to gas separation processes utilizing the improved membranes.
    Type: Grant
    Filed: April 22, 1991
    Date of Patent: July 21, 1992
    Assignee: Union Carbide Industrial Gases Technology Corporation
    Inventors: Benjamin Bikson, Joyce K. Nelson
  • Membrane nitrogen process and system
    Patent number: 5122355
    Abstract: Feed air is separated in a membrane system, with recovered nitrogen being purified in a deoxo unit and dried in an adsorbent dryer using high temperature purge gas. The heat generated in the deoxo unit can be used to satisfy the thermal energy requirements of dryer regeneration, without decrease in product recovery. Membrane permeate gas can be used for purge at high purge/feed ratio to reduce the energy requirements of bed regeneration.
    Type: Grant
    Filed: June 6, 1990
    Date of Patent: June 16, 1992
    Assignee: Union Carbide Industrial Gases Technology Corporation
    Inventors: Ravi Prasad, Oscar W. Haas, Frank Notaro, David R. Thompson