Patents Represented by Attorney, Agent or Law Firm Patrick J. Viccaro
  • Method of refining magnetic domains of electrical steels using phosphorus
    Patent number: 4911766
    Abstract: A method is provided for refining the magnetic domain wall spacing of grain-oriented silicon steel having a forsterite base coating thereon by removing portions of the base coating to expose a pattern of the underlying silicon steel, providing the exposed silicon steel with an environment selected from the group of phosphorus and phosphorus-bearing compounds, and then annealing the exposed steel, which is free of thermal and plastic stresses, in the phosphorus environment in a reducing atmosphere to produce in the steel a line of permanent bodies containing a phosphorus-bearing compound to effect heat resistant domain refinement and reduced core loss.A semi-finished sheet product of final texture annealed grain-oriented silicon steel is also provided.
    Type: Grant
    Filed: June 10, 1988
    Date of Patent: March 27, 1990
    Assignee: Allegheny Ludlum Corporation
    Inventors: S. Leslie Ames, Jeffrey M. Breznak
  • Austentitic stainless steel
    Patent number: 4911886
    Abstract: An austenitic alloy is provided having a desirable combination of properties by melting an alloy containing 25 to 27 weight percent chromium, 20 to 40 weight percent nickel, 5 to 7.0 percent molybdenum, 0.25 to 0.30 weight percent nitrogen, and the balance iron and incidental impurities. The alloys exhibit a CCCT value of greater than 49 degrees Centigrade, together with other desirable properties, can be so produced, while maintaining the level of resistance to stress corrosion cracking at a level higher than that of AISI Type 316L stainless steel.
    Type: Grant
    Filed: March 17, 1988
    Date of Patent: March 27, 1990
    Assignee: Allegheny Ludlum Corporation
    Inventors: Richard K. Pitler, John F. Grubb
  • Method of making a composite drawn article
    Patent number: 4906305
    Abstract: To obtain a composite material which has a substantially reduced incidence of defects after forming, there is made a composite having at least one layer of plain-carbon steel and, between it and a layer of stainless steel, an interleaving layer of silicon steel.
    Type: Grant
    Filed: August 18, 1988
    Date of Patent: March 6, 1990
    Assignee: Allegheny Ludlum Corporation
    Inventors: Ronald J. McCormick, G. Leonard Yeager
  • Method of producing stable magnetic domain refinement of electrical steels by metallic contaminants
    Patent number: 4904313
    Abstract: A method is provided for refining the magnetic domain wall spacing of grain-oriented silicon steel sheet having an insulation base coating thereon by removing portions of the base coating to expose a line pattern of the underlying silicon steel substantially transverse to the rolling direction of the steel, applying a metallic contaminant to the steel, the exposed steel being free of thermal and plastic stresses, and thereafter annealing the steel and contaminant thereon at time and temperatures of about 1400.degree. F. or more in a protective atmosphere to diffuse sufficient and controlled amounts of the comtaninant into the steel to produce a permanent pore stable up to 2100.degree. F. to effect heat resistant domain refinement and reduce core loss.
    Type: Grant
    Filed: June 10, 1988
    Date of Patent: February 27, 1990
    Assignee: Allegheny Ludlum Corporation
    Inventors: S. Leslie Ames, Jeffrey M. Breznak
  • Method of refining magnetic domains of barrier-coated electrical steels using metallic contaminants
    Patent number: 4904314
    Abstract: A method is provided for domain refinement of final texture annealed grain-oriented silicon steels by applying to the base coating a barrier coating for sealing the forsterite, removing portions of the base coating to expose a pattern of the underlying silicon steel, applying a metallic contaminant to the steel at least in the areas of the exposed steel which is free of thermal and plastic stresses, and thereafter annealing the steel having the barrier coating and contaminant thereon at time and temperature in a reducing atmosphere to diffuse sufficient and controlled amounts of the metallic contaminant and an element from the barrier coating into the exposed steel to produce a permanent pore to effect heat resistant domain refinement and reduced core loss.
    Type: Grant
    Filed: June 10, 1988
    Date of Patent: February 27, 1990
    Assignee: Allegheny Ludlum Corporation
    Inventors: S. Leslie Ames, Jeffrey M. Breznak
  • Apparatus for determining surface profiles of metallic workpieces
    Patent number: 4897925
    Abstract: An apparatus for determining the top and the bottom surface of a metallic workpiece, such as a steel slab. The apparatus is positioned proximate to the workpiece and includes a rail beam which may be translated across the width of the workpiece. A first arm is pivotally coupled to a first end of the rail beam and a second arm is pivotally coupled to a second end of the rail beam. The two arms are pivotally interconnected at top ends thereof by a tie rod, thereby forming three sides of a parallelogram. Deflection of the first arm during translation of the rail beam across causes a similar deflection of the second arm. The deflection of the second arm may be recorded, thereby recreating the surface profile of the workpiece.
    Type: Grant
    Filed: December 15, 1987
    Date of Patent: February 6, 1990
    Assignee: Allegheny Ludlum Corporation
    Inventor: Robert H. Johns
  • Shield cup protector apparatus for plasma arc torch
    Patent number: 4891489
    Abstract: A shield cup protector apparatus for protecting a ceramic shield cup of a plasma arc torch from breakage during operation thereof. The shield cup protector apparatus is comprised of an elongated cylinder having first and second open ends. A first open end of the elongated cylinder is positioned to abut a peripheral portion of the shield cup, allowing the shield cup to extend into an inner cavity formed by the cylinder, thereby allowing the shield cup to support the cylinder therefrom, while also allowing the elongated cylinder to surround the exposed surfaces of the shield cup to protect the shield cup thereby.
    Type: Grant
    Filed: November 3, 1988
    Date of Patent: January 2, 1990
    Assignee: Allegheny Ludlum Corporation
    Inventors: Lawrence A. Bollinger, Mark A. Tarhay
  • Method of producing grain-oriented silicon steel with small boron additions
    Patent number: 4878959
    Abstract: A method is provided for producing cube-on-edge grain-oriented silicon steel by producing 3 to 10 ppm boron and a manganese-to-sulfur and/or selenium ratio of at least 2.5 in a final gauge steel strip prior to final texture annealing and including a two-stage cold reduction wherein the final cold reduction is less than 75% to provide a steel having improved magnetic properties with a secondary grain size of less than 10 mm and a permeability of 1850 or more at 10 oersteds.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: November 7, 1989
    Assignee: Allegheny Ludlum Corporation
    Inventors: Carl P. Stroble, Anthony P. More
  • Separating-agent composition and method using same
    Patent number: 4871402
    Abstract: By adding an appropriate amount, 1 to 12 weight percent, based on the amount of magnesium oxide present and Loss On Ignition values of powdered magnesium metal to the magnesium oxide aqueous slurry composition used to make a separating-agent composition in the making of grain-oriented silicon electrical steel, there are obtained composition, an article, and a method characterized principally by a substantial decrease in the rate of rejections of the product of the final texturizing anneal because of coating defects--such difficulties as bare spots, and metal-overlay pattern. Moreover, the magnetic properties may be improved because of improved control of the propagation of the internally oxidized zone of the steel.
    Type: Grant
    Filed: June 21, 1988
    Date of Patent: October 3, 1989
    Assignee: Allegheny Ludlum Corporation
    Inventors: Nazmi Toker, Leroy R. Price
  • Apparatus for determining an edge profile of a metallic workpiece
    Patent number: 4858327
    Abstract: A portable apparatus for determining an edge profile of a metallic workpiece, such as a steel slab. An end portion of a tracking rod engages with an edge surface of the workpiece, and is translated along a vertical cross section of the edge surface. Variations of the surface of the edge of the workpiece causes deflection of the tracking rod. A pen mounted to the tracking rod is positioned proximate to a chart recorder thereby allowing the deflection of the tracking rod to be recorded as the tracking rod is translated, to thereby record the edge profile of the workpiece.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: August 22, 1989
    Assignee: Allegheny Ludlum Corporation
    Inventor: Robert H. Johns
  • Producing a weldable, ferritic stainless steel strip
    Patent number: 4834808
    Abstract: A weldable ferritic stainless steel and a method for producing the same is provided wherein the steel consists essentially of up to 0.03 carbon, up to 0.05 nitrogen, 10 to 25 chromium, up to 1.0 manganese, up to 0.5 nickel, up to 1.0 silicon, 0.03 to 0.35 titanium, 0.10 to 1.0 niobium, optionally up to 1.2 aluminum, the balance essentially iron, the amounts of titanium and niobium varying inversely and not more than necessary to satisfy specific thermodynamic equations and the method includes casting the steel into ingots or slabs without the precipitation of detrimental intermetallic or nonmetallic titanium compounds so that the hot-rolled band gauge, without grinding, can be cold rolled to final gauge sheet or strip free of open surface defects.
    Type: Grant
    Filed: September 8, 1987
    Date of Patent: May 30, 1989
    Assignee: Allegheny Ludlum Corporation
    Inventor: James B. Hill
  • Apparatus for introducing gas into molten metal baths
    Patent number: 4824080
    Abstract: An apparatus for introducing gas into a molten metal bath contained within a refractory-lined vessel by the distribution of gas bubbles in the metal bath. The distribution is disbursed and covers a wide areas and mixing within the bath is improved. This is accomplished with the use of a tuyere having a plurality of passageways which cause gas passing through the tuyere to exit into the bath as a series of gas jets which exit from the tuyere at an angle to its longitudinal axis. Preferably, the passageways in the tuyere are spiral so as to produce a swirling or vortical gas motion within the bath.
    Type: Grant
    Filed: February 4, 1988
    Date of Patent: April 25, 1989
    Assignee: Allegheny Ludlum Corporation
    Inventor: Joseph W. Tommaney
  • Method for processing cold-rolled stainless-steel sheet and strip
    Patent number: 4824536
    Abstract: A method is provided for further processing cold-rolled, stainless-steel sheet or strip by being induction-heated to an annealing temperature in the range of up to 2300 degrees Fahrenheit, causing the formation thereon of a scale of having thickness of less than 2000 Angstroms, followed by electrolytic descaling at high current density in an aqueous solution of 15 to 25 weight percent of sodium sulfate, maintained at a temperature of at least 150 degrees Fahrenheit.
    Type: Grant
    Filed: June 15, 1988
    Date of Patent: April 25, 1989
    Assignee: Allegheny Ludlum Corporation
    Inventors: Yeong-U Kim, Donald R. Zaremski
  • Thermocouple selection switch
    Patent number: 4821285
    Abstract: A thermocouple selection switch for monitoring thermocouples positioned within tunnel furnace cars allows a plurality of thermocouples to be monitored, while, at the same time, avoiding the requirement of precisely aligning the tunnel furnace car with an external probe. The selection switch is comprised of a plurality of switch stations, each of which contain longitudinally extending contact rails which when contacted with an external probe at any point along the length of the contact rails establishes electrical contact with opposite sides or wires of thermocouple.
    Type: Grant
    Filed: December 15, 1987
    Date of Patent: April 11, 1989
    Assignee: Allegheny Ludlum Corporation
    Inventor: Robert H. Johns
  • Random inventory system
    Patent number: 4796209
    Abstract: A method for locating and retrieving a randomly placed object, such as a steel coil, in a warehouse, such as a crane bay of a steel mill storage warehouse. The method comprises the steps of attaching an indicia identification to the object, recording the indicia of identification, determining the coordinates of the object, indexing the indicia to the coordinates, and retrieving the object with a transporting means.
    Type: Grant
    Filed: June 26, 1986
    Date of Patent: January 3, 1989
    Assignee: Allegheny Ludlum Corporation
    Inventor: David L. Burk
  • Manufacture of ductile high-permeability grain-oriented silicon steel
    Patent number: 4793873
    Abstract: For making a ductile boron-containing grain-oriented silicon steel, there is practiced, at a late stage in the making of the product either during the final texture anneal or a subsequent anneal, a high-temperature anneal in a reducing atmosphere with the use of a separating-agent coating, particularly magnesium oxide, which contains an effective amount of a compound of molybdenum and/or tungsten.
    Type: Grant
    Filed: June 3, 1987
    Date of Patent: December 27, 1988
    Assignee: Allegheny Ludlum Corporation
    Inventor: Douglas C. Dean
  • Coil protector for "C" hooks
    Patent number: 4784419
    Abstract: A coil protector for "C" hooks includes a pad of cushioning material secured to by straps in spaced slots to the "C" hook. Reinforcing mesh material is molded into the pad between the slots and the vertical leg to which the pad is to be secured to prevent tearing of the pad by straps. The pad is preferably molded from urethane or some similar cushioning material; and the reinforcing mesh material; is preferably a welded steel wire cloth, expanded metal, or a high strength abrasion resistant fiber.
    Type: Grant
    Filed: March 3, 1988
    Date of Patent: November 15, 1988
    Assignee: Allegheny Ludlum Corporation
    Inventors: Jorn E. Jensen, Roy C. Bongartz
  • Separating-agent composition and method using same
    Patent number: 4781769
    Abstract: By adding an appropriate amount, 1 to 12 weight percent, based on the amount of magnesium oxide present and Loss On Ignition values of powdered magnesium metal to the magnesium oxide aqueous slurry composition used to make a separating agent composition in the making of grain-oriented silicon electrical steel, there are obtained composition, an article, and a method characterized principally by a substantial decrease in the rate of rejections of the product of the final texturizing anneal because of coating defects--such difficulties as bare spots, and metal-overlay pattern. Moreover. the magnetic properties may be improved because of improved control of the propagation of the internally oxidized zone of the steel.
    Type: Grant
    Filed: December 29, 1986
    Date of Patent: November 1, 1988
    Assignee: Allegheny Ludlum Corporation
    Inventors: Nazmi Toker, Leroy R. Price
  • Capacitive electrical discharge scribing for improving core loss of grain-oriented silicon steel
    Patent number: 4780155
    Abstract: A method and apparatus are provided for domain refinement of texture annealed and insulation coated grain-oriented silicon steel strip by contacting the insulated steel surface to be scribed with a discharge electrode, moving the electrode substantially transverse to the rolling directioln while essentially maintaining contact, and marking the steel with a plurality of electrical discharge craters generally aligned across the steel by producing a plurality of electrical discharges between the electrode and steel from a capacitor of 0.001-10.0 microfarads.
    Type: Grant
    Filed: May 8, 1987
    Date of Patent: October 25, 1988
    Assignee: Allegheny Ludlum Corporation
    Inventors: James A. Salsgiver, Eugene W. Bartel, Rowland C. Rudolf, III
  • Plasma arc hole cutter
    Patent number: 4778155
    Abstract: A plasma arc hole cutting device is disclosed for removing selected portions of metal workpieces, such as stainless steel, for testing or marking purposes. A plasma torch is connected at one end to a rotatable cam element and spaced a distance from the center of the cam element such that rotation of the cam element by a drive motor causes the plasma torch to rotate in an orbit about a longitudinal axis defined by the cam element. Suitably supported, the plasma torch burns a circular hole through the workpiece, thereby creating a slug which may be removed and analyzed, leaving a circular hole in the workpiece.
    Type: Grant
    Filed: July 23, 1987
    Date of Patent: October 18, 1988
    Assignee: Allegheny Ludlum Corporation
    Inventors: Robert M. Suchevich, Lawrence A. Bollinger