Patents Represented by Attorney Brian G. Brunsvold
  • Patent number: 4435157
    Abstract: A heat exchanger and especially a blast preheater (or cowper) for blast furnaces with refractory lining, insulating layer and steel jacket is described, the insulating layer of which is designed so that a steel jacket temperature of from 20.degree. to 60.degree. C. can be set and that said steel jacket is made of chromeless structural steel having a molybdenum content in the range from 0.01 to 2% by weight. The blast preheater (or cowper) has a prolonged service life and a low tendency to nitrate tension crack corrosion of the jacket sheet, for which reason it is very suitable for use in a process for the temperature control of gas and blast for the blast furnace. The process is suitable for blast preheaters (or cowpers) with external or internal combustion chamber or checker chamber and downstream collector ducts.
    Type: Grant
    Filed: January 15, 1982
    Date of Patent: March 6, 1984
    Assignee: Brohltal-Deumag AG fur feuerfeste Erzeugnisse
    Inventors: Hans-Eugen Buhler, Horst Kalfa
  • Patent number: 4423026
    Abstract: A method for improving the density and other properties of caustic magnesia and sintered periclase. To improve the density of sintered periclase, acid or acid salt is admixed with magnesium hydroxide, followed by caustic-firing, pressing and high-firing. If desired, the admixture is dried before caustic-firing. Alternatively, the step of caustic-firing may be omitted. To improve the density and compactability of caustic magnesia, acid or acid salt is admixed with magnesium hydroxide, followed by caustic-firing. If desired, the admixture is dried before caustic-firing. Preferably, acetic acid is used.
    Type: Grant
    Filed: April 22, 1980
    Date of Patent: December 27, 1983
    Assignee: General Refractories Company
    Inventor: Richard A. Snellgrove
  • Patent number: 4399982
    Abstract: A blast furnace taphole plugging composition comprising a coal tar binder, a refractory filler and a very heavy aromatic petroleum oil which fails to polymerize at the high heating rates experienced during normal application of the taphole mix to the taphole. Preferred aromatic petroleum oils useful in the present invention have a minimum boiling temperature of 700.degree. F. and above and a boiling range between 700.degree. F. and 1000.degree. F. Methods of making and using such plasticized tar bonded blast furnace taphole mixes are also disclosed.
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: August 23, 1983
    Assignee: General Refractories Company
    Inventor: Francis W. Henry, Jr.
  • Patent number: 4387173
    Abstract: Compositions for forming carbon-containing refractory brick or shape comprising a refractory filler, a binder for said filler and a hardening agent for said binder, said binder comprising a mixture of polymers formed by the homopolymerization of resorcinol. Compositions for forming a carbon-containing refractory brick or shape as above described are also disclosed in which a basic refractory filler is employed and hardening agents are unnecessary. Methods of forming carbon-containing refractory brick or shape are also disclosed involving milling of a dry binder comprising a mixture of polymers formed by the homopolymerization of resorcinol with the refractory filler or mixture of a solution of such a binder material with the refractory filler, either of which may be conducted at ambient temperature.
    Type: Grant
    Filed: April 16, 1981
    Date of Patent: June 7, 1983
    Assignee: General Refractories Company
    Inventors: Francis W. Henry, Jr., Merrill Wood, Jr., Ljubisa Rankovic
  • Patent number: 4383624
    Abstract: A refractory slide gate for a container dispensing molten material is comprised of a metal-supporting can filled with a low-fired coherent bonded refractory. The refractory is formed into a coherent refractory body within the metal supporting can and is directly affixed thereto, without the use of refractory mortar. An orifice through the refractory controls the flow of molten material.
    Type: Grant
    Filed: January 15, 1982
    Date of Patent: May 17, 1983
    Assignee: General Refractories Company
    Inventors: Joseph L. Stein, Thomas J. Maskell
  • Patent number: 4381355
    Abstract: A non-aqueous taphole mix comprising a binder, a non-aqueous solvent for the binder and a refractory filler, the binder comprising a mixture of polymers formed by the homopolymerization of resorcinol and a hardening agent. Also disclosed are carbon-containing specialties comprising a binder, a solvent for the binder, and a refractory filler, the binder comprising a mixture of polymers formed by the homopolymerization of resorcinol and a hardening agent.
    Type: Grant
    Filed: April 16, 1981
    Date of Patent: April 26, 1983
    Assignee: General Refractories Company
    Inventors: Francis W. Henry, Jr., Henry E. Anthonis, III, Subrata Banerjee
  • Patent number: 4313997
    Abstract: Perlite board made from expanded perlite and a binder having the property of permanent tackiness in the dry state. The board may be made by expanding the perlite, adding a tacky resin emulsion to the perlite, drying the mixture and forming it into a board-like product.
    Type: Grant
    Filed: July 14, 1980
    Date of Patent: February 2, 1982
    Assignee: Grefco, Inc.
    Inventors: David L. Ruff, Narikottile G. Nath
  • Patent number: 4302344
    Abstract: Fire resistant, loose-fill, thermal insulation made of a mixture of particulate expanded perlite and cellulose fiber. The mixture is rendered non-settling and resistant to separation by applying a permanently tacky material to the particulate expanded perlite.
    Type: Grant
    Filed: February 22, 1980
    Date of Patent: November 24, 1981
    Assignee: Grefco, Inc.
    Inventors: David L. Ruff, N. Gokul Nath
  • Patent number: 4294618
    Abstract: A monolithic refractory composition including from about 63% to about 90% by weight high purity Al.sub.2 O.sub.3 ; from about 2% to 8% by weight crystalline silica having a particle size of -200 mesh; from about 2% to 6% by weight high purity Cr.sub.2 O.sub.3 ; from about 1% to 8% by weight high purity kaolin clay having a particle size of -10.mu. (micron); and from about 5% to 15% by weight phosphate binder. About 1-5% water may be substituted for Al.sub.2 O.sub.3. Preferably, the high purity Al.sub.2 O.sub.3 is a mixture of tabular alumina and calcined alumina and the phosphate binder is H.sub.3 PO.sub.4.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: October 13, 1981
    Assignee: General Refractories Company
    Inventor: Henry E. Anthonis
  • Patent number: 4261154
    Abstract: An external plating arrangement for improved effectiveness in sealing off the cold end face of a refractory body, wherein the side walls of the body are sheathed with metal plates and planar portions extend normally from the plates and overlie the cold end face for encasing the perimeter of the cold end face. A separate metal plate may cover the cold end face, the planar portions having a form of elongated tabs for overlying the end plate. Alternatively, the planar portions may be right triangular for completely covering the cold end face, or one of the planar portions may be rectangular for covering the cold end face, the other planar portions being elongated tabs overlying the rectangular plate.
    Type: Grant
    Filed: April 10, 1979
    Date of Patent: April 14, 1981
    Assignee: General Refractories Company
    Inventor: Jeffrey A. Mazur
  • Patent number: 4260872
    Abstract: A fast response ceramic ignitor which is particularly adapted for use with household current as a replacement for gas pilot lights, the ignitor being formed from pure lanthanum chromite, or lanthanum chromite which has been doped with combinations of niobium, magnesium, or strontium ions in quantities sufficient to provide desired electrical resistivity characteristics.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: April 7, 1981
    Assignee: General Refractories Company
    Inventors: Franz J. Brodmann, Ronald Staut
  • Patent number: 4255489
    Abstract: Expanded perlite is coated with polysiloxane, the coating dried, and subsequently strengthened by heating to form an attrition-resistant, non-porous, particulate filler suitable for inclusion in polymeric materials to reduce their bulk density.
    Type: Grant
    Filed: March 12, 1979
    Date of Patent: March 10, 1981
    Assignee: Grefco, Inc.
    Inventor: Richard B. Nielsen
  • Patent number: 4212778
    Abstract: Improved periclase refractories are prepared by using an alkyd resin binder for tempering and pressing periclase grains into refractory shapes such as bricks. The pressed shapes are dried and fired. After firing, the refractory shapes are impregnated under vacuum with molten pitch and can then be used as lining in basic oxygen steelmaking furnaces. The fired refractory bricks have a greatly improved modulus of rupture at 1482.degree. C. of 3000-4000 p.s.i. The alkyd resin is generally incorporated in amounts of 2.5 to 4.5 weight percent.The green strength of the alkyd resin bonded bricks can be improved by adding a strong organic acid to the alkyd resin prior to mixing it with periclase grains. The green strength of bricks produced from such a mixture is between 30 and 40 p.s.i.
    Type: Grant
    Filed: September 17, 1975
    Date of Patent: July 15, 1980
    Assignee: General Refractories Company
    Inventor: Wate T. Bakker
  • Patent number: 4212755
    Abstract: Thermal insulation of particulate expanded perlite that forms a low density, settle-resistant mass due to the coating of the perlite particles with a material rendering the individual particles slightly tacky.
    Type: Grant
    Filed: February 6, 1978
    Date of Patent: July 15, 1980
    Assignee: Grefco, Inc.
    Inventors: David L. Ruff, N. Gokul Nath
  • Patent number: 4208214
    Abstract: Improved carbon-containing, chemically bonded, refractory compositions, usually magnesia or alumina base, including about 1% to 20% by weight carbon and about 0.5% to 10% by weight steel fibers, low carbon steel fibers, or stainless steel fibers of about 10-50 mm in length and about 0.1 mm to about 1.0 mm in diameter of any cross-sectional shape distributed in the carbon-bearing matrix and bonded thereto. Other fibers compatible with both the intended application and the base composition may also be used.
    Type: Grant
    Filed: April 21, 1978
    Date of Patent: June 17, 1980
    Assignee: General Refractories Company
    Inventors: Joseph L. Stein, George A. Russell, Jr., Gunther L. Mortl
  • Patent number: 4187174
    Abstract: A method is provided for treating diatomaceous earth filteraids having a beer-soluble iron content of less than about 0.01% to further reduce the beer-soluble iron content by maintaining the filteraids in contact with a relatively small volume of an acid. In the filteraids so produced, the beer-soluble iron content can be reduced by as much as 70% to 100%. In making the filteraids of this invention, sulfuric acid in about 0.1 to about 3.0 normal solution can be used to treat the starting filteraids.
    Type: Grant
    Filed: December 27, 1978
    Date of Patent: February 5, 1980
    Assignee: Grefco, Inc.
    Inventors: Richard B. Nielsen, Charles J. Vogelsang
  • Patent number: 4183980
    Abstract: Expanded perlite is coated with polysiloxane, the coating dried, and subsequently strengthened by heating to form an attrition-resistant, non-porous, particulate filler suitable for inclusion in polymeric materials to reduce their bulk density.
    Type: Grant
    Filed: March 14, 1978
    Date of Patent: January 15, 1980
    Assignee: Grefco, Inc.
    Inventor: Richard B. Nielsen
  • Patent number: 4179264
    Abstract: Particulate unexpanded perlite is introduced to an expansion apparatus that utilizes the combustion of a gas as a source of heat. The particulate perlite is mixed with a combustible gas, air from a first source and oxygen and thereafter introduced to a burner section. The amount of oxygen introduced is in the range of from 1.5 to 16 weight percent of the amount of air introduced. The amount of combustible gas in the mixture is related to the air input from the first source, being in the range of 1 volume of combustible gas to 2 to 6 volumes of air.
    Type: Grant
    Filed: November 8, 1977
    Date of Patent: December 18, 1979
    Assignee: Dicalite Europe Nord, S.A.
    Inventor: Gerard R. Vancauwenberghe
  • Patent number: 4175158
    Abstract: Particulate perlite fines are agglomerated to increase the apparent particle size by forming a mixture of the perlite fines with a compound such as boric acid capable of being substantially converted to B.sub.2 O.sub.3 at elevated temperatures. The mixture is heated while mixing to convert the compound to B.sub.2 O.sub.3 and to at least partially coat the particulate perlite.The mixture is then heated above the melting point of B.sub.2 O.sub.3 to agglomerate the perlite fines. The product of this process has particular utility as an improved filter aid.
    Type: Grant
    Filed: October 17, 1977
    Date of Patent: November 20, 1979
    Inventor: Elerington Saunders
  • Patent number: 4156661
    Abstract: A method of decreasing the electrical resistivity of a rare-earth chromite material by substituting bivalent metal ions for some of the chromium or rare-earth ions therein. The method includes applying a solution containing the bivalent metal ions to the rare-earth chromite under vacuum conditions, drying the solution on the chromite, and diffusing the bivalent metal ion into the rare-earth chromite by firing the chromite in a controlled atmosphere.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: May 29, 1979
    Assignee: General Refractories Company
    Inventors: Franz J. Brodmann, Ronald Staut