Patents Represented by Attorney Alvin H. Fritschler

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  • Thermal removal of binders from ceramic-particle bodies
    Patent number: 5419857
    Abstract: A process for removing binder from a body comprising ceramic particles and binder by heating the body at a substantially constant rate of temperature rise over the temperature range where a peak rate of body weight loss occurs in a gaseous environment of inert gas and oxidizer wherein the oxidizer concentration varies with the rate of temperature rise to reduce the peak rate of body weight loss.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: May 30, 1995
    Assignee: Praxair Technology, Inc.
    Inventor: Jaak S. Van den Sype
  • Vacuum pressure swing adsorption process
    Patent number: 5415683
    Abstract: A trans-atmospheric pressure swing adsorption process is carried out using product gas for purge and partial repressurization in the production of oxygen from air. No transfer of gas is made directly from one bed to another, as for pressure equalization purposes, but the power requirements are reduced under controlled pressure swing conditions.
    Type: Grant
    Filed: November 17, 1993
    Date of Patent: May 16, 1995
    Assignee: Praxair Technology, Inc.
    Inventor: Frederick W. Leavitt
  • Oxygen-separating porous membranes
    Patent number: 5411580
    Abstract: Oxygen-separating porous membranes comprise a complex of (a) a transition metal (II) ion, (b) a ligand, and (c) an aromatic amine, retained in the pores of a substrate.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: May 2, 1995
    Assignee: Praxair Technology, Inc.
    Inventors: Eishun Tsuchida, Hiroyuki Nishide, Hiroyoshi Kawakami, Yukiko Sasame
  • Tuning of vacuum pressure swing adsorption systems
    Patent number: 5407465
    Abstract: Vacuum and other pressure swing adsorption vessels are monitored, and corrective adjustments are made in the pressure equalization and/or repressurization steps in response to imbalances in the temperature profiles of the vessels in order to tune the system. The PSA process is also desirably purge tuned to avoid over purging or under purging of each vessel.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: April 18, 1995
    Assignee: Praxair Technology, Inc.
    Inventors: Herbert R. Schaub, James Smolarek, Frederick W. Leavitt, Lee J. Toussaint, Kimberly A. LaSala
  • Drop-in furnace lining
    Patent number: 5395096
    Abstract: A cast refractory and back-up insulation are positioned on a lifting frame for convenient placement in, and removal from, the furnace shell of an aluminum or other metal refining system. Furnace lining replacement is thereby readily accomplished at the operational location of the furnace.
    Type: Grant
    Filed: December 29, 1993
    Date of Patent: March 7, 1995
    Assignee: Praxair Technology, Inc.
    Inventors: Nelson C. Moreira, Raymond J. Sarlitto, Michael J. Fisher, Thomas Bisco
  • High purity membrane nitrogen
    Patent number: 5378263
    Abstract: Multi-stage membrane systems are arranged so that, with the same number of modules and compressors, mixing losses upon combining recycle and feed streams are minimized. Membrane surface area and power requirements are reduced thereby.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: January 3, 1995
    Assignee: Praxair Technology, Inc.
    Inventor: Ravi Prasad
  • Single bed pressure swing adsorption system and process
    Patent number: 5370728
    Abstract: A single bed, air separation PSA system utilizes an external product surge tank to supply product oxygen and purge gas to the adsorbent bed. An equalization tank supplies void space gas to the bed for repressurization purposes.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: December 6, 1994
    Assignee: Praxair Technology, Inc.
    Inventors: Kimberly A. LaSala, Herbert Schaub
  • Terephthalic acid production
    Patent number: 5371283
    Abstract: Oxygen or an oxygen-rich gas is used in the production of terephthalic acid in a reaction system that mitigates the flammability hazards associated therewith. Lower reactant and solvent consumption is achieved, with lower production of unwanted by-products, lower gas handling costs and lower environmental impact concerns than with conventional air based terephthalic acid production.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: December 6, 1994
    Assignee: Praxair Technology, Inc.
    Inventors: Jeffrey P. Kingsley, Anne K. Roby, Lawrence M. Litz
  • Production and use of improved composite fluid separation membranes
    Patent number: 5356459
    Abstract: Multilayer composite membranes are produced in a one-step coating process that provides an interior gas separation layer and an external defect sealing layer.
    Type: Grant
    Filed: June 30, 1993
    Date of Patent: October 18, 1994
    Assignee: Praxair Technology, Inc.
    Inventors: Benjamin Bikson, Joyce K. Nelson
  • Oxygen enrichment method and system
    Patent number: 5356600
    Abstract: In systems in which air is introduced into a liquid as a source of oxygen, additional oxygen added independent of the feed air enhances the oxygen content of the liquid source significantly than if the same amount of additional oxygen were combined with the feed air.
    Type: Grant
    Filed: September 24, 1990
    Date of Patent: October 18, 1994
    Assignee: Praxair Technology, Inc.
    Inventors: Kazuo Kiyonaga, Lawrence M. Litz, Thomas J. Bergman
  • Particle loader
    Patent number: 5324159
    Abstract: A uniformly packed bed of adsorbent particles is formed using a particle loader adapted to provide a uniform flow of adsorbent particles across the cross sectional area of an adsorption vessel.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: June 28, 1994
    Assignee: Praxair Technology, Inc.
    Inventors: Jeffert J. Nowobilski, James S. Schneider
  • Membrane/PSA-deoxo process for nitrogen production
    Patent number: 5318759
    Abstract: A deoxo unit is operated with excess oxygen to produce high purity nitrogen from a partially purified stream passing from a membrane or pressure swing adsorption unit. Essentially complete fuel utilization is achieved in applications in which essentially oxygen-free nitrogen product is not required.
    Type: Grant
    Filed: October 21, 1992
    Date of Patent: June 7, 1994
    Assignee: Praxair Technology, Inc.
    Inventors: Michael J. Campbell, Ravi Prasad, James Smolarek
  • In-line dispersion of gas in liquid
    Patent number: 5302325
    Abstract: The dispersion of a gas in a liquid is enhanced by accelerating a gas/liquid mixture to supersonic velocity, with subsequent deacceleration, in a conical in-line mixer.
    Type: Grant
    Filed: September 25, 1990
    Date of Patent: April 12, 1994
    Assignee: Praxair Technology, Inc.
    Inventor: Alan T. Cheng
  • Rotor speed control for an aluminum refining system
    Patent number: 5275385
    Abstract: The rotor drive of an aluminum refining system is operated under constant current, rather than at constant rotor speed. As a result, smooth, stable refining operations are conveniently achieved in commercial practice.
    Type: Grant
    Filed: December 23, 1992
    Date of Patent: January 4, 1994
    Assignee: Praxair Technology, Inc.
    Inventor: John F. Pelton
  • Apparatus for separating and recycling cleaning particles for cleaning furnace tubes
    Patent number: 5266169
    Abstract: A center transfer unit positioned between a solids collection chamber and a cleaning particle vessel contains vibrating inclined screens to separate chunks of waste solids from cleaning particles recycled to the cleaning particle vessel.
    Type: Grant
    Filed: June 3, 1992
    Date of Patent: November 30, 1993
    Assignee: Praxair Technology, Inc.
    Inventors: Cathy J. Geary, Joseph L. Greene, Jr., Larry F. Knight, Ronald W. DeLorme
  • Fluxless solder coating and joining
    Patent number: 5255840
    Abstract: An essentially fluxless soldering process enables a solder coating to be applied to a surface under controlled pressure conditions enabling the volume and shape of the solder to be desirably controlled. Coatings produced by essentially fluxless processes enable joining processes to be carried out in an essentially fluxless manner with highly desirable processing flexibility.
    Type: Grant
    Filed: May 5, 1992
    Date of Patent: October 26, 1993
    Assignee: Praxair Technology, Inc.
    Inventor: Mark S. Nowotarski
  • Oxygen bleaching of textiles
    Patent number: 5244466
    Abstract: Textile bleaching operations are enhanced by passing the cloth being treated alternately between an aqueous hydrogen peroxide solution and an oxygen-containing head space.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: September 14, 1993
    Assignee: Praxair Technology, Inc.
    Inventors: Lawrence M. Litz, Thomas J. Bergman, Jr.
  • Enhanced gas-liquid mixing under variable liquid operating level conditions
    Patent number: 5244603
    Abstract: A gas-liquid mixing system employs an impeller/draft tube assembly submerged in liquid. Hollow eductor tubes affixed to the impeller drive shaft are used to flow gas from an overhead gas space to the liquid in the vicinity of the assembly. The positioning and size of the eductor tubes are such as to maximize the desired gas-liquid mixing and reaction rate.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: September 14, 1993
    Assignee: Praxair Technology, Inc.
    Inventor: Robert B. Davis
  • Gas turbine steam addition
    Patent number: 5241816
    Abstract: The output of gas turbines is enhanced by gas moisturization using a water contact tower and a pumped water recirculation loop with low pressure steam addition thereto.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: September 7, 1993
    Assignee: Praxair Technology, Inc.
    Inventor: Raymond F. Drnevich
  • Oxygen enriched air system
    Patent number: RE34434
    Abstract: Enriched oxygen from a pressure swing adsorption system and air are blended to provide oxygen enriched air of desired purity, particularly for use at flow rates between those for which liquid oxygen and on-site cryogenic air separation plants are desirable.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: November 9, 1993
    Assignee: Praxair Technology, Inc.
    Inventors: Michael J. Campbell, James Smolarek, John J. Pietruszewski