Patents Examined by Steven Capella
  • Patent number: 4842650
    Abstract: Various improvements for polymer modified cementitious compositions are disclosed. A dry mix for making a polymer modified cementitious composition especially useful as a stucco material, which includes a dry, redispersible, non-reemulsifiable polymer at a polymer-cement ratio of between about 0.04:1 to about 0.15:1, is disclosed. Also, the use of sodium acyl (coco) isethionate as a superior wetting agent in polymer modified cementitious composition is disclosed. In addition, the use of non-bridging, plastic fibers for use in pumpable cementitious compositions is disclosed.
    Type: Grant
    Filed: April 11, 1986
    Date of Patent: June 27, 1989
    Assignee: Sencon Systems Incorporated
    Inventor: Wayne J. Blounts
  • Patent number: 4808557
    Abstract: The present invention is characterized by ceramic materials comprising ceramic sintered bodies consisting of (1) 1-90 wt % chromium carbide and the remainder carbonic titanium nitride; (2) 1-90 wt % chromium carbide, 0.1-5 wt % B.sub.4 C and the remainder titanium carbo-nitride; or (3) either of the above compositions plus less than 95 wt % of a metal boride such as Ti or Zr. Such ceramic sintered bodies are used for cutting tools or wear-resistant machine parts because of their high density, high hardness and high strength.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: February 28, 1989
    Assignees: Kyushu Director of Institute, Itaru Todoroki, Tokyo Kokyu Rozai Co., Ltd.
    Inventors: Tadahiko Watanabe, Kazuhisa Shobu, Yuko Tsuya, Yuji Enomoto, Junshiro Hayakawa, Osamu Yagishita, Hideki Yamamoto, Eiichi Sudoh
  • Patent number: 4806165
    Abstract: A particulate solid activator comprising a porous material containing absorbed P.sub.2 O.sub.5 values can be prepared by a process which comprises spray drying a slurry of a liquid P.sub.2 O.sub.5 material and the porous material to obtain the particulate solid. The P.sub.2 O.sub.5 material can be a mixture of a phosphoric acid and an ammonium phosphate solution. The porous material can be diatomaceous earth. The resulting particulate solid activator can be dry blended with a magnesium-containing compound, e.g. MgO, and an optional aggregate to form a magnesium phosphate fast-setting cement mixture. This mixture reacts in the presence of an aqueous component at ambient temperature to form a monolithic solid.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: February 21, 1989
    Assignee: Stauffer Chemical Company
    Inventors: Elliot I. Band, Fawzy G. Sherif
  • Patent number: 4802922
    Abstract: A capsule contains in separate compartments the interactive components of a self setting composition which according to the invention comprise as base component a paste of high alumina cement, water and a source of CaO and SiO.sub.2 --e.g. as a single source granulated blast furnace slag; and as a catalyst component a paste of lime, water and a water soluble lithium salt. When reacted the components form a set cement containing hydrated phases typical of an OPC.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: February 7, 1989
    Assignee: Fosroc International Limited
    Inventor: Roderick M. Smart
  • Patent number: 4801439
    Abstract: A process for preparing tractable preceramic precursors of Group IIIA metal/Group VA nonmetal compounds, such as BN, in which a first reactant containing a Group VA nonmetal to hydrogen bond, such as ammonia or an amine is reacted with a second reactant containing a Group IIIA metal to hydrogen bond, such as a metal hydride, in the presence of a metal catalyst that catalyzes dehydrocoupling of the bonds to form the precursor. Further reaction of the precursor in the presence of the catalyst forms oligomeric/polymeric forms of the precursor.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: January 31, 1989
    Assignee: SRI International
    Inventors: Yigal D. Blum, Richard M. Laine
  • Patent number: 4800184
    Abstract: A method for producing sulfur plates comprises producing an aqueous mixture by mixing and agitating sulfur powder, inorganic powder, fibers and water, filtering the aqueous mixture to form plates, molding the plates while dewatering, curing and drying the plates, and heating the plates at a temperature higher than the melting point of the sulfur. The sulfur plates attain a desired strength in a short time and are free from any cracks and have an excellent acid resistance.
    Type: Grant
    Filed: August 4, 1987
    Date of Patent: January 24, 1989
    Assignees: Kabushiki-Kaisha Yamau, Onoda Cement Company Limited
    Inventors: Masaki Kawasaki, Kunio Mizukami
  • Patent number: 4798201
    Abstract: A surgical dressing is described which consists essentially of a film which carries an adhesive layer for securing the dressing to the body characterized in that (a) the film is continuous and comprises a polymer which in contact with water has a higher MVP than when in contact with moisture vapor but not water; (b) the adhesive layer is adapted to allow access of water to the film when water is in contact with the adhesive layer so that (c) the surgical dressing has an MVP of not less than 2500 g/m.sup.2 when the adhesive layer is in contact with water and has an MVP of not more than 2000 g/m.sup.2 when the adhesive is in contact with moisture vapor but not water; whereby the dressing is suitable for use on exuding wounds and on non-exuding wounds.
    Type: Grant
    Filed: December 30, 1986
    Date of Patent: January 17, 1989
    Assignee: Smith and Nephew Associated Companies p.l.c.
    Inventors: David A. Rawlings, William D. Potter
  • Patent number: 4797160
    Abstract: Compositions containing crystalline, straight chain, alkyl hydrocarbons as phase change materials including cementitious compositions containing the alkyl hydrocarbons neat or in pellets or granules formed by incorporating the alkyl hydrocarbons in polymers or rubbers; and polymeric or elastomeric compositions containing alkyl hydrocarbons.
    Type: Grant
    Filed: August 19, 1987
    Date of Patent: January 10, 1989
    Assignee: University of Dayton
    Inventor: Ival O. Salyer
  • Patent number: 4797158
    Abstract: A flexible grout composition is used to cement a conduit within a bore hole to prevent fluid loss, for sealing and grouting well casings, plugging abandoned wells, and waterproofing earthen structures. The flexible grout composition includes a water-swellable clay, such as bentonite; a particulate filler, such as calcium bentonite; and a water soluble silicate. The grout composition is mixed with water to form a slurry and the slurry is pumped into its intended location, for example, within the annulus defined between an outer surface of a conduit or casing disposed within a bore hole, and the surrounding earthen formation formed, for example, by drilling.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: January 10, 1989
    Assignee: American Colloid Company
    Inventor: Todd D. Harriett
  • Patent number: 4793861
    Abstract: The invention relates to a cement-based product which is reinforced with glass fibers having good resistance to alkaline environments. The product of the invention contains, for each 100 parts by weight of cement, about 10 to 40 parts by weight of metakaolin, the latter exhibiting a reactivity to the modified Chapelle test greater than 500 mg of CaO per gram of metakaolin. The product of the invention has many uses in the building trade, particularly to produce facade coverings.
    Type: Grant
    Filed: July 7, 1987
    Date of Patent: December 27, 1988
    Assignee: Vetrotex Saint-Gobain
    Inventor: Jean-Michel Sohm
  • Patent number: 4792361
    Abstract: Friction materials intended to be used as brake shoes, brake pads, and other brake components, comprising a composite in which one or more friction modifiers is embedded in a high strength cement matrix.The matrix material exhibits a flexural strength of at least 1,500 psi, a compressive strength of at least about 15,000 psi and a flexural modulus of about 1.times.10.sup.6 psi.
    Type: Grant
    Filed: August 8, 1986
    Date of Patent: December 20, 1988
    Assignee: Cemcom Corp.
    Inventors: David D. Double, Randall P. Bright, Sean Wise
  • Patent number: 4792539
    Abstract: A novel process for producing clay derivatives having porous structure comprises hydrolyzing a metal alkoxide such as Al(OR).sub.3, Ti(OR).sub.4 and Si(OR).sub.4 in which each R represents a linear or branched hydrocarbon group having from 1 to 6 carbon atoms, deflocculating the resulting hydrolyzate with an acid to obtain a hydrous metal oxide sol, and reacting the sol with smectite.The thus obtained porous clay derivatives have larger interlaminar interstices and a larger surface area than conventional ones. The interstices can be arbitrarily controlled by the acid amount. In addition, the derivatives are thermally stable so that they can be widely utilized in various fields as pigments, encapsulating agents, adsorbents, catalysts, carriers for catalysts and the like.
    Type: Grant
    Filed: June 4, 1986
    Date of Patent: December 20, 1988
    Assignee: Kao Corporation
    Inventors: Shoji Yamanaka, Makoto Hattori, Yuji Suzuki
  • Patent number: 4792358
    Abstract: This invention provides an inorganic coating composition comprising (a) about 100 parts by weight (based on solids) of a binder component prepared by thermally dissolving about 10 to about 40 parts by weight of fine particles of silica in about 100 parts by weight (based on solids) of potassium silicate and (b) about 15 to about 100 parts by weight of pearl luster pigment.
    Type: Grant
    Filed: April 6, 1987
    Date of Patent: December 20, 1988
    Assignee: Okuno Chemical Industry Co., Ltd.
    Inventors: Toshiro Kimura, Giichi Okuno, Yukikazu Moritsu, Koji Yamada
  • Patent number: 4789652
    Abstract: The present invention resides in the provision of a basic unburned brick or castable refractory which contains none or an extremely small amount of components which exert a harmful influence on molten steel such as phosphorus, sulfur, and boron and which has a high hot strength.
    Type: Grant
    Filed: October 20, 1986
    Date of Patent: December 6, 1988
    Assignee: Shinagawa Refractories Co., Ltd.
    Inventors: Kenji Ichikawa, Hiroyuki Sugimoto, Ryosuke Nakamura, Akihiro Morita
  • Patent number: 4788166
    Abstract: A high-hardness sintered article having high-pressure phase boron nitride as its matrix is manufactured by preparing a mixture consisting of 65 to 95% by volume of a high-pressure phase boron nitride formed of boron nitride of cubic phase having a continuous grain size distribution ranging fom a maximum grain size of 10 to 50 .mu.m to a minumum grain size of less than 1 .mu.m and optionally admixed with wurtzite type boron nitride, 4 to 34% by volume of carbide, nitride or carbonitride of titanim alone or in conjunction with carbide, nitride, or carbonitride of tantalum, and the balance to make up 100% by volume of aluminum and sintering the mixture at a temperature of at least 1,200.degree. C. under pressure of at least 20,000 atmospheres. A high-hardness sintered article is obtained without entailing any loss of hardness during the course of sintering by additionally incorporating in the mixture as 100% 0.
    Type: Grant
    Filed: February 28, 1986
    Date of Patent: November 29, 1988
    Assignee: Nippon Oils & Fats Co., Ltd.
    Inventors: Masatada Araki, Yutaka Kuroyama
  • Patent number: 4786017
    Abstract: Fibrous silicon dioxide material that is resistant to high temperatures, particularly in the form of mats or plates, is produced by dry-spinning water glass into water glass fibers, the water glass fibers being then transformed into silica fibers by treatment with aqueous acid or salt solutions that contain hydrogen ions. The silica fibers are thereupon treated with an agent that accelerates the formation of cristobalite from amorphous silica. Such agents include, in particular, alkali hydrogen phosphates, sodium acetate and solium chloride. The fibers are dried and dehydrated at temperatures above 600.degree. C., particularly between 950.degree. C. and 1050.degree. C., before or after treatment with the accelerating agent. There dehydration occurs after such treatment, the fibers are subsequently subjected to thermal aftertreatment. When subjected to 1500.degree. C.
    Type: Grant
    Filed: September 9, 1987
    Date of Patent: November 22, 1988
    Assignee: AKZO NV
    Inventors: Arno Wegerhoff, Hans-Dieter Achtsnit
  • Patent number: 4786331
    Abstract: A cement dispersion agent comprising calcium polystyrene sulfonate having a weight average molecular weight of 5,000 to 50,000 and having a sulfonation degree of 80% or more. Further, a cement dispersion agent comprising (a) a polystyrene sulfonate and (b) at least one component selected from the group consisting of hydroxycarboxylic acids, ketocarboxylic acids, and the salts thereof.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: November 22, 1988
    Assignee: Lion Corporation
    Inventors: Shigeyuki Ueda, Yoshimitsu Sekiguchi, Kazuaki Yamaguchi
  • Patent number: 4784691
    Abstract: A dry cement composition containing an amount of ferrous sulphate (FS) for eliminating or substantially reducing the content of water-soluble chromate, is produced by grinding a starting material (C, G) in a cement mill, and the ground cement material is passed from the mill to a storage container (33) The ferrous sulphate in an amount of 0.01-10 and preferably 0.4 percent by weight is added to and mixed with the starting material in a dry or non-dissolved condition at a location or at locations upstreams of the storage container (33). The ferrous sulphate is preferably added to the starting material upstream of the cement mill.
    Type: Grant
    Filed: July 21, 1987
    Date of Patent: November 15, 1988
    Assignee: Aktieselskabet Aalborg Portland - Cement - Fabrik
    Inventor: Poul L. Rasmussen
  • Patent number: 4781760
    Abstract: The present invention relates to a method for improving the water separation and compression strength of cement mortar and concrete, and for extending the time taken for the cement mortar and concrete to stiffen, by adding to the mortar and concrete a waste sludge obtained by neutralizing with alkali mother liquor and optionally also contaminated gas-washing liquors obtained when producing aluminum fluoride from aluminum hydroxide and hexafluorosilicic acid. The waste sludge is added to the cement mortar and concrete in quantitites corresponding to less than 10% of a prescribed cement weight, preferably 1-5%.
    Type: Grant
    Filed: August 11, 1987
    Date of Patent: November 1, 1988
    Assignee: Aluflour Aktiebolag
    Inventors: Kjell Svensson, Sepp Zechner
  • Patent number: 4780303
    Abstract: Processes for the continuous preparation of high concentration sodium hypochlorite which controls sodium chloride formed to prevent fouling of heat exchanger equipment and to provide sodium chloride particle sizes on the order of 400 microns or greater to facilitate filtration and reduce the mother liquor retention in the salt, which processes comprise reacting in two stages pure chlorine or chlorine diluted with inert gases with a sodium hydroxide having a concentration of from about 20 to about 50 weight percent, in which the first stage of chloration of the sodium hydroxide is carried out in an absorption column wherein the concentration of sodium hypochlorite and sodium hydroxide are respectively limited to 15% and 4.5% by weight, and in the second stage of chloration, the sodium hypochlorite solution leaving the absorption column is treated with pure chlorine or chlorine diluted with inert gases in a crystallizer equipped with suitable agitation.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: October 25, 1988
    Assignee: Produits Chimiques Ugine Kuhlmann
    Inventor: Jacques Dugua