Patents Examined by Lorenzo B. Hayes
  • Patent number: 4645454
    Abstract: A heat sinterable porcelain powder mix and a method of preparing a sintered porcelain product of desired color, particularly for use in the fabrication of dental appliances, which mix comprises an admixture of a porcelain powder with an organic liquid binder, which binder has an index of refraction the same or substantially the same as the index of refraction of the porcelain powder, thereby permitting visualization of the true post-sintered color of the porcelain powder mix during application and prior to heat sintering.
    Type: Grant
    Filed: May 8, 1985
    Date of Patent: February 24, 1987
    Assignee: Forsyth Dental Infirmary for Children
    Inventors: Benjamin H. Amdur, Edwin J. Riley, Ralph B. Sozio
  • Patent number: 4645456
    Abstract: The novel system for the bonding of dental filling composites and orthodontic adhesives to tooth enamel wherein the enamel is treated with a 2.5%-15% aqueous solution of a strong mineral acid or organic acid. The enamel is rinsed with water and thoroughly dried. A curable hydrophilic monomer primer is placed upon the enamel, said enamel primer being selected from the group consisting of esters having the generic formula: ##STR1## wherein R is H or CH.sub.3 and n is 1-8; esters of the general formula: ##STR2## wherein R=H or CH.sub.3 and n is 2-8; the mono and dimethacrylates or acrylates of glycerol; andacrylic or methacrylic acid.A methacrylate or acrylate based orthodontic adhesive or dental composite is cured on the surface of the primed enamel to give a material strongly bonded to the enamel surface.
    Type: Grant
    Filed: August 26, 1985
    Date of Patent: February 24, 1987
    Assignee: Lee Pharmaceuticals, Inc.
    Inventor: Jack L. James
  • Patent number: 4643769
    Abstract: A composition suitable for the preparation of a surface protective coating composition e.g. a paint by admixture with an organic film-forming binder comprises (i) elemental zinc in particulate form and (ii) inorganic oxide particles such as silica having corrosion inhibiting cations e.g. calcium chemically bound to the surface by ion exchange. The amount of elemental zinc to inorganic oxide is preferably from 75:1 to 3:1 by weight. The binder can be organic e.g. an epoxy resin, epoxy ester, chlorinated rubber or polystyrene or may be inorganic e.g. silicates.
    Type: Grant
    Filed: March 18, 1986
    Date of Patent: February 17, 1987
    Assignee: The British Petroleum Company p.l.c.
    Inventor: David G. Othen
  • Patent number: 4643741
    Abstract: A thermostable polycrystalline diamond body is produced by pre-treating the diamond crystals with molten base or salt, mixing the pre-treated diamond crystals with silicon powder or a blend of silicon and one or more substances, subjecting the mixture to a combination of high-pressure and high-temperature and maintaining the pressure and temperature for a period of time. The thermostable polycrystalline diamond body is characterized in having diamond crystals uniformly distributed in the body. The diamond crystals are covered by .beta.-silicon carbide and that the diamond crystals together with .beta.-silicon carbide form an uninterrupted framework throughout the entire body, the interstices of which are filled with elemental silicon or silicon-containing refractory phases. A polygonal graphite mold having walls of equal thickness useful in the production of said thermostable polycrystalline diamond body is also provided.
    Type: Grant
    Filed: December 14, 1984
    Date of Patent: February 17, 1987
    Inventors: Hongchang Yu, Zhen Yang, Chaodong Wang, Zhongqing Zai
  • Patent number: 4643740
    Abstract: The invention relates to a process for brazing refractory particles, notably tungsten carbide grits, onto a substrate such as a tool blank to provide an armor coating or a cutting edge thereon, which process comprises applying to the substrate a brazing material, a particulate refractory material to be brazed onto the substrate and a binder composition; and connecting the substrate to a source of an electric current to cause the current to flow through the substrate whereby the substrate is heated to sufficient temperature to cause the brazing material to fuse. The invention also provides apparatus for carrying out the invention.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: February 17, 1987
    Assignee: C4 Carbides plc
    Inventor: Peter J. Nicolson
  • Patent number: 4642126
    Abstract: Previous coated abrasives with adhesives suited to rapid, UV light initiated cure often had intractable curl problems. Therefore, such coated abrasives have been unsuited to precision finishing of workpieces with strict flatness or other curvature requirements, such as read-write heads for magnetic recorders or computer memories.This invention provides coated abrasives, having adhesives with cure initiated by UV light, which are suited to curvature control by the methods used conventionally for magnetic recording media. The preferred adhesive formulations include reaction products of 2-hydroxyethyl acrylate with polyol polyester oligomers capped with isocyanate end groups, alkoxylated diacrylated monomers, and N-vinyl pyrrolidone and other monomers with only one polymerizable unsaturated double bond per molecule, and sometimes also include nonpolymerizable thermoplastic polymers.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: February 10, 1987
    Assignee: Norton Company
    Inventors: Eugene Zador, Wesley R. Kaczmarek, Sitaramaiah Ravipati
  • Patent number: 4641579
    Abstract: An improved fountain solution and viscosity control thereof is disclosed for lithographic printing using dampening systems of the continuous type, such as a Dahlgren system. The fountain solution utilizes a viscosity imparting or thickening agent for viscosity control, such as hydroxypropylmethyl cellulose, to effect a desired viscosity. A thickened solution is prepared, and this solution is added to an aqueous solution including an ionic etch to provide a fountain solution having a viscosity of between about 20 seconds and about 22 seconds as measured in a #1 Shell cup.
    Type: Grant
    Filed: November 21, 1984
    Date of Patent: February 10, 1987
    Assignee: R. R. Donnelley & Sons Company
    Inventor: Irwin B. Bernstein
  • Patent number: 4639474
    Abstract: A monolithic refractory composition having relatively high thermal conductivity and a relatively high degree of water insolubility consisting essentially of, by weight, 50-75% coarse grain flake graphite; 5-30% fine grain flake graphite; and the remainder crude clay; and the addition based upon the total weight of said mix of 10-25% liquid phenolic resin in combination with an alcoholic solvent, and a resin curing agent.
    Type: Grant
    Filed: December 8, 1983
    Date of Patent: January 27, 1987
    Assignee: Dresser Industries, Inc.
    Inventor: Thomas F. Vezza
  • Patent number: 4636254
    Abstract: Silver flake and lead borate glass frit are suspended in a liquid organic vehicle of resin and solvent. The silver flakes are present in two different size ranges. The plate is applied between the silicon die and the substrate and is oven fired to provide a bond that accommodates the different coefficients of thermal expansion of the silicon and ceramic substrate. The smaller silver particles improve the sintering of the silver and glass and thereby increase the bond strength while the larger silver particles minimize undersirable shrinkage and cracking of the resultant bond. Silver oxide particles or a special solvent mixture are also used in the paste.
    Type: Grant
    Filed: March 10, 1986
    Date of Patent: January 13, 1987
    Assignee: Quantum Materials, Inc.
    Inventors: Frank D. Husson, Jr., Kathleen E. Walter
  • Patent number: 4636262
    Abstract: A foundry green molding sand composition comprising molding sand, clay and water uniformly admixed with a composition of an alkali metal salt of carboxyhexose or carboxyheptose and an alkanoate salt of magnesium and/or lithium in amounts and proportions sufficient to impart improved green sand properties to said compositions. In the preferred embodiment, the composition is added in the form of about a 50% aqueous solution of sodium glucoheptonate and magnesium acetate which are present in the solution in a weight ratio of about 2:1.
    Type: Grant
    Filed: March 11, 1986
    Date of Patent: January 13, 1987
    Inventor: Edgar H. Reed
  • Patent number: 4636407
    Abstract: Lubricant composition comprised of clay, two polydimethylsiloxanes, poly(ethylene glycol and/or propylene glycol) and surfactant(s); tire cure bladder coated therewith; and a method of molding a rubber tire utilizing such a coated cure bladder.
    Type: Grant
    Filed: August 6, 1985
    Date of Patent: January 13, 1987
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Louis F. Comper, Robert F. Scheiderich
  • Patent number: 4634469
    Abstract: A parting composition useful for continuously casting aluminum and aluminum alloys and comprising glycerol trioleate, castor oil and a copper corrosion inhibitor. The parting composition of the invention has superior properties compared with parting compositions previously used for continuous ingot casting. The copper corrosion inhibitor prevents deterioration around openings in oil injection rings made from copper.
    Type: Grant
    Filed: March 21, 1985
    Date of Patent: January 6, 1987
    Assignee: Aluminum Company of America
    Inventors: Joseph T. Laemmle, John Bohaychick, Willie Lansdale
  • Patent number: 4634468
    Abstract: A catalytic adsorbate suspended in an aqueous solution comprising reduced catalytic metal on an organic suspending agent where the reduced catalytic metal has a maximum dimension not exceeding 500 angstroms. The catalytic adsorbate is useful for the electroless metal deposition of substrates that are non-catalytic to electroless metal deposition.
    Type: Grant
    Filed: May 7, 1984
    Date of Patent: January 6, 1987
    Assignee: Shipley Company Inc.
    Inventors: Michael Gulla, Oleh B. Dutkewych, John J. Bladon
  • Patent number: 4632852
    Abstract: In a process for electroless copper plating in an electroless copper plating solution containing a copper salt, a complexing agent for the copper salt, a reducing agent for the copper salt, and a pH-adjusting agent, a plating film having distinguished mechanical properties can be obtained by adding at least one of soluble inorganic silicon compounds and soluble inorganic germanium compounds and conducting the electroless copper plating by injecting an oxygen-containing gas into the plating solution or by adding an oxidizing agent to the plating solution or by both injection or the oxygen-containing gas and addition of the oxidizing agent thereto. The stability of the electroless copper plating solution can be maintained better thereby and substantially thick plating is possible.
    Type: Grant
    Filed: June 18, 1985
    Date of Patent: December 30, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Haruo Akahoshi, Kanji Murakami, Mineo Kawamoto, Motoyo Wajima, Rituji Toba, Shoji Kawakubo, Akio Tadokoro
  • Patent number: 4632767
    Abstract: Antistatic agents for synthetic fibers comprising 5-50 weight percent of a specific type of quaternary ammonium alkyl phosphate containing 1 weight percent or less of by-product alkali metal halides and 50-95 weight percent of alkali metal salt of saturated alkyl phosphate have improved antistatic characteristics both in high and low humidity conditions, reduce the amount of deposits that fall off, yellowing by a heat treatment and generation of rust, and allow good coiling forms to be obtained.
    Type: Grant
    Filed: November 26, 1985
    Date of Patent: December 30, 1986
    Assignee: Takemoto Yushi Kabushiki Kaisha
    Inventors: Masatsugu Saiki, Yoshio Imai, Makoto Takagi
  • Patent number: 4631083
    Abstract: Pipe varnish compositions effective to inhibit corrosion of steel pipe over appreciable periods of time of storage of said steel pipe, said compositions comprising a thixotropic overbased calcium organic sulfonate calcium carbonate complex; and a drying oil such as linseed oils; a drier, preferably of the paint drier type, such as cobalt naphthenate, zirconium octoate and manganese salts or soaps, or mixtures thereof; and also containing at least one member of the group of epoxidized oils, polybutenes, and alkyd resins; and, optionally, such ingredients as waxes, petrolatums and resins.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: December 23, 1986
    Assignee: Witco Corporation
    Inventors: Harold H. Christhilf, Paul E. Morrison, Paul W. Niemczura
  • Patent number: 4631088
    Abstract: A road asphalt composition having a penetration at 25.degree. C. in the range of 85 to 100 is made by blending together: (a) a pitch having an initial boiling point of at least 520.degree. C. obtained as a residue in the visbreaking of crude oil, and (b) a distillation residue having a penetration at 25.degree. C. in the range of 150 to 500 obtained in the distillation of crude oil.
    Type: Grant
    Filed: December 11, 1985
    Date of Patent: December 23, 1986
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of Energy, Mines and Resources
    Inventor: Marc-Andre Poirier
  • Patent number: 4629746
    Abstract: Apart from polymerizable organic binders, a radiopaque dental material contains a fluoride of the rare earth metals or mixtures of such fluorides, as well as optionally further inorganic compounds as fillers. The dental material is suitable as a one or two-component filling material for dental cement, as a crown and bridge material, as well as for producing dentures, inlays and implants and is characterized by a high radiopacity and at the same time a good transparency.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: December 16, 1986
    Assignee: Etablissement Dentaire Ivoclar
    Inventors: Rudolf J. Michl, Volker M. Rheinberger, Gilbert Ott
  • Patent number: 4626283
    Abstract: Amine-complexed zinc salts of organic diacids selected from the group consisting of (i) dicarboxylic acids, (ii) diphenols, and (iii) phthalic acids. Specifically disclosed compounds include C.sub.2 -C.sub.3 alkylene diamine-complexed zinc salts of thiodiphenol and sulfonyldiphenol, and ethylene diamine-complexed salts of phthalic, isophthalic and terephthalic acids. Such amine-complexed zinc salts have utility as corrosion inhibitors in coating compositions for metallic substrates, e.g., paints based on alkyds, latexes or linseed oil. Also disclosed are anticorrosion additives, comprising the aforementioned amine-complexed salts distended on mineral fillers such as kaolin, and a method of making same by reaction of zinc oxide, amine, and organic diacid, at elevated temperatures, in an aqueous slurry of the mineral filler. At least the dicarboxylic acid and diphenol derived salts also display utility as inhibitors of marine growth (algae and barnacles) on substrates.
    Type: Grant
    Filed: March 21, 1985
    Date of Patent: December 2, 1986
    Assignee: Engelhard Corporation
    Inventors: Evon Martins, Richard A. Slepetys
  • Patent number: RE32318
    Abstract: An aqueous lubricating composition for tire curing bladders containing polydimethylsiloxane, methyl hydrogen or methyl trimethoxy silane, a surfactant and optionally a metal salt of an organic acid.
    Type: Grant
    Filed: November 15, 1984
    Date of Patent: December 30, 1986
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Louis F. Comper, deceased, Robert F. Scheiderich