Patents Assigned to AT&T Technologies, Inc.
  • 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
  • Duplex coatings for various substrates
    Patent number: 5223332
    Abstract: A duplex coating for substrates that comprises an undercoat of tungsten carbide-cobalt having a strain-to-fracture of greater than 4.3.times.10.sup.-3 inch per inch and a top coat of a ceramic material such as alumina in which the ratio of the thickness of the top coat to the undercoat is from 6:1 to 1:3.
    Type: Grant
    Filed: May 31, 1990
    Date of Patent: June 29, 1993
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Jean M. Quets
  • Liquid transfer articles and method for producing them
    Patent number: 5221562
    Abstract: The invention relates to a liquid transfer article, such as a printing roll, having a laser-engraved coated surface comprised of wells adapted to receive a liquid and land areas adapted to be wiped free of any liquid prior to contacting a receiving surface so that only the liquid in the wells are transferred. The land areas of the coated surface have a density of greater than 95% theoretical and a roughness of less than 6 micro-inches R.sub.a to insure that any unwanted liquid on the land areas can be wiped clean prior to contacting a receiving surface. The invention also relates to a method for producing the liquid transfer article.
    Type: Grant
    Filed: October 1, 1991
    Date of Patent: June 22, 1993
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Russell M. Morgan
  • Non-stoichiometric titanium nitride coating
    Patent number: 5185211
    Abstract: A wear and erosion resistant coating for substrates having a non-nitrogen titanium-containing outer surface onto which a non-stoichiometric titanium nitride coating is deposited in which the nitrogen content in the titanium nitride coating is from 32.5 to 47 atomic weight percent.
    Type: Grant
    Filed: July 11, 1991
    Date of Patent: February 9, 1993
    Assignee: Praxair S.T. Technology, Inc.
    Inventors: Jiinjen A. Sue, Harden H. Troue
  • Boron nitride boat and process for producing it
    Patent number: 5182149
    Abstract: A pyrolytic boron nitride boat having a cavity suitable for use in growing and doping semi-conductor crystals such as gallium arsenide and said cavity having a roughened surface formed of substantially uniform projected no nodules, disturbances, or ridges.
    Type: Grant
    Filed: March 1, 1991
    Date of Patent: January 26, 1993
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Robert L. Finicle
  • Boron nitride crucible
    Patent number: 5158750
    Abstract: A boron nitride crucible having a closed end, an open end, an internal surface and an external surface, and wherein at least a portion of the external surface, preferably proximate the open end of the crucible, has a duplex coating comprising an undercoat of pyrolytic graphite and a top coat of pyrolytic boron nitride. A process for making the boron nitride crucible is also disclosed.
    Type: Grant
    Filed: August 27, 1991
    Date of Patent: October 27, 1992
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Robert L. Finicle
  • Methods of soot overcladding an optical preform
    Patent number: 4941905
    Abstract: An optical preform is prepared first by depositing soot about a glass subate rod (22) to form a boule. Then the soot boule is sintered to consolidate the material and provide a preform from which optical fiber is drawn. The boule is relatively large so that the resulting preform is capable of providing more optical fiber than those used in the past. In order to be able to sinter successfully the enlarged boule, microwave energy from a furnace (60) is coupled to the glass rod so that the sintering proceeds from the rod radially outwardly thereby allowing gases readily to escape and rendering the process highly efficient.
    Type: Grant
    Filed: March 4, 1988
    Date of Patent: July 17, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Technologies, Inc.
    Inventor: Pundi L. Narasimham
  • Apparatus for adjusting optical fiber connector components
    Patent number: 4914866
    Abstract: An alignment sleeve (66) for holding two conically shaped portions (30--30) of plugs (24--24) each of which terminates an optical fiber (25) includes two conically shaped cavities (68, 70) communicating through a common minimal diameter plane (72). After the sleeve has been molded, a tool (100) faced with an abrasive material is inserted into each cavity of the sleeve and turned rotatably while a force is applied in a direction parallel to the longitudinal axis of the tool. This causes material to be removed from the walls defining the cavities so that when the two plugs are inserted into the cavities, the axes of the fibers will be aligned coaxially and the end faces of the fibers will have a predetermined separation. The apparatus of this invention also may be used to adjust a length measurement of plugs. This is accomplished by inserting a plug into a conically shaped cavity of a tool.
    Type: Grant
    Filed: January 27, 1989
    Date of Patent: April 10, 1990
    Assignees: American Telephone and Telegraph Co., AT&T Technologies, Inc.
    Inventors: Kenneth W. Jackson, Norman R. Lampert, Harold F. Muth, Jr.
  • Marked retractile telephone cord
    Patent number: D306999
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: April 3, 1990
    Assignee: American Telephone and Telegraph Company, AT&T Technologies, Inc.
    Inventors: Douglas S. Moore, Theodore M. Trujillo, Charles L. Woods