Patents Assigned to Praxair S.T. Technology, Inc.
  • Molten zinc resistant alloy and its manufacturing method
    Patent number: 5456950
    Abstract: An alloy of 3 to 9 weight percent boron with the balance molybdenum for use as a thermal spray coating for articles intended to be exposed to molten zinc.
    Type: Grant
    Filed: May 25, 1994
    Date of Patent: October 10, 1995
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: John C. Wood, Shoichi Katoh, Hideo Nitta
  • Coating composition having good corrosion and oxidation resistance
    Patent number: 5455119
    Abstract: A coating composition comprising an alloy having the formula RCrAlR'R" wherein R is nickel, cobalt or the like; R' is yttrium or hafnium and R" is tantalum, rhenium and/or platinum, preferably mixed with an oxide dispersion such as alumina, to provide an improved class of coatings suitable for operating in high temperature oxidizing environments.
    Type: Grant
    Filed: November 8, 1993
    Date of Patent: October 3, 1995
    Assignees: Praxair S.T. Technology, Inc., Rolls-Royce PLC
    Inventors: Thomas A. Taylor, David F. Bettridge, Robert C. Tucker, Jr.
  • Nickel-chromium corrosion coating and process for producing it
    Patent number: 5451470
    Abstract: An impervious corrosion resistance nickel-chromium coating on a metallic substrate, such as an iron-containing alloy substrate that protects the substrate from a corrosive media and the process for producing the coating on the substrate.
    Type: Grant
    Filed: April 12, 1994
    Date of Patent: September 19, 1995
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: Adil A. Ashary, Robert C. Tucker, Jr.
  • Braze filler metal alloy paste
    Patent number: 5443658
    Abstract: A braze filler metal alloy paste containing braze metal alloy powders, such as a nickel- or cobalt-based braze filler metal, homogeneously dispersed throughout an aqueous gel solution comprising a binder such as a cellulose material, for example, sodium carboxymethyl-cellulose and a dispersants such as mineral oil and glycerine.
    Type: Grant
    Filed: June 8, 1994
    Date of Patent: August 22, 1995
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Frank J. Hermanek
  • Method for fluorescent measuring the volumetric capacity of a cell-engraved surface
    Patent number: 5438864
    Abstract: A method of using a fluorescent fluid on a cell-engraved surface, such as an anilox roll, to determine the volumetric capacity of the cell-engraved surface by having the amount of electromagnetic radiation emitted by the exciting of the fluorescent fluid substantially proportional to the volume of the fluorescent fluid in the cells.
    Type: Grant
    Filed: August 25, 1993
    Date of Patent: August 8, 1995
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Russell M. Morgan
  • Process for forming a refractory oxide coating
    Patent number: 5418015
    Abstract: A thermal spray powder feed coating composition composed of stabilized zirconia mixed with zircon and a selected oxide, such as yttria, to form a refractory oxide coating ideally suited for hearth rolls for annealing steel. Process for producing the coating and the coated article so produced is also disclosed.
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: May 23, 1995
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: John E. Jackson, Hideo Nitta, Katoh Shoichi, Masahiko Amano, Yasushi Kurisu, Keiichiro Ohno
  • Fluid-cooled hollow copper electrodes and their use in corona or ozone applications
    Patent number: 5401368
    Abstract: A hollow elongated copper corona electrode that contains a dielectric coating and is cooled by a fluid, such as a water-base liquid, being fed through the electrode and a process for using such an electrode in a corona apparatus or in an ozone generator.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: March 28, 1995
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: Keith G. Ford, Peter K. Stephenson, Russell B. Hatch
  • Carbide or boride coated rotor for a positive displacement motor or pump
    Patent number: 5395221
    Abstract: A rotor for a positive displacement motor or pump in which the rotor is coated with a metal carbide and metal alloy coating or a metal boride and metal alloy coating to impart excellent wear-resistance and corrosion-resistance properties to the rotor when used in abrasive and/or corrosion resistance environmental.
    Type: Grant
    Filed: March 18, 1993
    Date of Patent: March 7, 1995
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: Robert C. Tucker, Jr., Melvin D. Mendenhall, Madapusi K. Keshavan
  • Silicide coating having good resistance to molten metals
    Patent number: 5389454
    Abstract: A silicide of a refractory metal such as Cr, Mo, Ta, Nb, W, Zr, Ti and V, preferably CrSi.sub.2 and MoSi.sub.2 are materials that are resistant to attack by molten metals, such as zinc, and which materials can provide coatings for various articles. The method for producing the coated materials is also disclosed.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: February 14, 1995
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: John C. Wood, Shoichi Katoh
  • Molten zinc resistant alloy and its manufacturing method
    Patent number: 5360675
    Abstract: An alloy of 3 to 9 weight percent boron with the balance molybdenum for use as a thermal spray coating for articles intended to be exposed to molten zinc.
    Type: Grant
    Filed: May 11, 1993
    Date of Patent: November 1, 1994
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: John C. Wood, Shoichi Katoh, Hideo Nitta
  • Nickel-chromium corrosion coating and process for producing it
    Patent number: 5326645
    Abstract: An impervious corrosion resistance nickel-chromium coating on a metallic substrate, such as an iron-containing alloy substrate that protects the substrate from a corrosive media and the process for producing the coating on the substrate.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: July 5, 1994
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: Adil A. Ashary, Robert C. Tucker, Jr.
  • Powder feed composition for forming a refraction oxide coating, process used and article so produced
    Patent number: 5304519
    Abstract: A thermal spray powder feed coating composition composed of stabilized zirconia mixed with zircon and a selected oxide, such as yttria, to form a refractory oxide coating ideally suited for hearth rolls for annealing steel Process for producing the coating and the coated article so produced is also disclosed.
    Type: Grant
    Filed: October 28, 1992
    Date of Patent: April 19, 1994
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: John E. Jackson, Hideo Nitta, Katoh Shoichi, Masahiko Amano, Yasushi Kurisu, Keiichiro Ohno
  • Striping process for stripping compounds of titanium from base metals
    Patent number: 5290362
    Abstract: An aqueous stripping solution and method for selectively removing a titanium compound from a base metal. The aqueous solution contains a source of hydrogen peroxide, an alkali source of hydroxyl ions and an acid with the components in a concentration such that the pH of the solution is above 8.
    Type: Grant
    Filed: December 28, 1992
    Date of Patent: March 1, 1994
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Jiinjen A. Sue
  • Process for forming a crack-free boron nitride coating on a carbon structure
    Patent number: 5275844
    Abstract: A process for producing a crack-free coating of pyrolytic boron nitride on a carbon structure in which the coating is formed in a controlled atmosphere containing vapors of ammonia and gaseous boron halide within a temperature range of between 1500.degree. C. to 1700.degree. C.
    Type: Grant
    Filed: January 10, 1992
    Date of Patent: January 4, 1994
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Arthur W. Moore
  • Water cooled rolls for cooling steel sheets
    Patent number: 5242363
    Abstract: A water-cooled roll for cooling steel sheets is spray-coated on the surface that comes in contact with the steel sheets with a cermet composed of a metal oxide having a higher hardness and lower thermal conductivity than metals and a metal matrix of Ni- or Co-base heat-resisting alloy. The metal oxide is chosen from among Al.sub.2 O.sub.3, Cr.sub.2 O.sub.3, SiO.sub.2, and ZrO.sub.2, and the metal matrix consists of an MCrAlY (M=Co or Ni). Preferably, the metal oxide is alumina and the metal matrix, CoCrAlYTa.
    Type: Grant
    Filed: August 14, 1992
    Date of Patent: September 7, 1993
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: Hideo Nitta, Mamoru Hisada
  • Substoichiometric zirconium nitride coating
    Patent number: 5242753
    Abstract: A wear and erosion resistant coating for substrates which comprises a substoichiometric zirconium nitride coating having a nitrogen content in the zirconium nitride coating from 41 to 48 atomic weight percent.
    Type: Grant
    Filed: July 11, 1991
    Date of Patent: September 7, 1993
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: Jiinjen A. Sue, Harden H. Troue
  • Nonaqueous composition for slip casting or cold forming refractory material into solid shapes
    Patent number: 5238986
    Abstract: The composition of the present invention is composed of finely divided solid refractory material suspended in a nonaqueous liquid slip composition. The nonaqueous liquid slip composition consists essentially of a deflocculent composed of a vinyl chloride and vinyl acetate resin dissolved in an organic solvent. The composition may be slip cast or cold formed into a low density article which is then sintered into a dense product.
    Type: Grant
    Filed: February 21, 1992
    Date of Patent: August 24, 1993
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Lionel C. Montgomery
  • Method for resistance heating of metal using a pyrolytic boron nitride coated graphite boat
    Patent number: 5239612
    Abstract: A method of resistance heating using a graphite container having a graphite body and a pyrolytic boron nitride coating in which a metal charge of predetermined weight is deposited over the coating and the container is heated by the application of a variable source of electrical power to cause the metal charge to fully evaporate in a short interval of time of less than two minutes with the heat cycle controlled to provide a cool down period in each cycle of applied power and with a new metal charge introduced upon completion of each heat cycle in a semi-continuous fashion.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: August 24, 1993
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Joseph M. Morris
  • Method for engraving solid articles with laser beams and the articles produced
    Patent number: 5236763
    Abstract: A method for engraving a series of consecutive cells in a solid surface, such as a liquid transfer surface, by impinging on the surface a pulsed laser beam in which the pulses of the laser beam are formed in a series of consecutive groups of two or more consecutive pulses and each of said groups form an individual cell in the solid surface. The article produced is also described.
    Type: Grant
    Filed: June 3, 1992
    Date of Patent: August 17, 1993
    Assignee: Praxair S. T. Technology, Inc.
    Inventor: Pierre Luthi
  • Stripping solution for stripping compounds of titanium from base metals
    Patent number: 5232619
    Abstract: An aqueous stripping solution and method for selectively removing a titanium compound from a base metal. The aqueous solution contains a source of hydrogen peroxide, an alkali source of hydroxyl ions and an acid with the components in a concentration such that the pH of the solution is above 8.
    Type: Grant
    Filed: May 28, 1992
    Date of Patent: August 3, 1993
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Jiinjen A. Sue