Patents Examined by J. Poer
  • Alumina-silicon carbide refractories and their method of manufacture
    Patent number: 4069060
    Abstract: Alumina-silicon carbide refractory characterized by comprising predominantly an inter growth texture. The alumina-silicon carbide is manufactured by adding fine aluminum powder to a body of silica-alumina type refractory compound, mixing, molding and drying the resultant mixture to obtain a green body and finally firing the green body in an atmosphere containing predominantly a carbon oxide gas.
    Type: Grant
    Filed: September 19, 1975
    Date of Patent: January 17, 1978
    Assignee: Shinagawa Refractories Co., Ltd.
    Inventors: Takeshi Hayashi, Masao Shibuno
  • Ceramic materials
    Patent number: 4067745
    Abstract: Calcia-partially-stabilized zirconia ceramic materials which contain between 3.3 and 4.7 percent of calcia by weight. Such materials have a fine-scale two-phase microstructure substantially consisting of metastable, tetragonal domains of a critical size within cubic matrix grains, which domains, in regions of high stress, irreversibly transform to normal monoclinic form upon stressing of the body.The materials are produced by firing a zirconia body containing between 3.3 and 4.7 percent by weight of calcia at a temperature between 1700.degree. C and 1950.degree. C and allowing the body to cool at an average rate of at least 175.degree. C per hour to a temperature within the range 1200.degree. to 1450.degree. C; followed by ageing with said temperature range for a time such that peak strength is obtained.
    Type: Grant
    Filed: October 24, 1975
    Date of Patent: January 10, 1978
    Assignee: Commonwealth Scientific and Industrial Research Organization
    Inventors: Ronald Charles Garvie, Richard Henri Jan Hannink, Richard Terry Pascoe
  • Phospha-alumina gel and method of preparation
    Patent number: 4066572
    Abstract: A novel phospha-alumina gel having a large average pore diameter and a characteristic pore volume distribution is prepared by co-precipitation of aluminum and phosphorus compounds. The gel is then dried, formed and calcined to give a material having a large average pore diameter of at least 100 A and a characteristic pore volume distribution with a minimum number of small pores, such that less than 30% of the total pore volume is in pores smaller than 100 A in diameter. Such material is especially useful as a catalyst or as a catalyst support.
    Type: Grant
    Filed: October 12, 1976
    Date of Patent: January 3, 1978
    Assignee: Nalco Chemical Company
    Inventor: Monica E. Choca
  • Aluminous refractory composition containing carbon
    Patent number: 4066467
    Abstract: A plastic refractory lining composition which can be applied by hand or trowel to refractory or bare metal surfaces and is particularly resistant to slag and hot metal erosion and to metal skulling is comprised of a blend of high alumina or aluminum silicate coarse aggregates with a fine matrix of calcined alumina, carbon, and bentonite employing a phosphate binder and tetrasodium pyrophosphate for modification and stabilization of plasticity characteristics. Finely divided silicon metal can be included to impart oxidation resistance to the carbon. This refractory is sufficiently "sticky" for ease of building a lining.
    Type: Grant
    Filed: February 18, 1977
    Date of Patent: January 3, 1978
    Assignee: Chicago Fire Brick Company
    Inventor: Harold L. Rechter
  • Method for the treatment of finely grained material, particularly for the precalcining of cement
    Patent number: 4066470
    Abstract: A method and mechanism for calcining cement wherein the material is preheated in a precalcining zone and a vertical conduit leads heated discharge gases upwardly from a main calcining furnace, a supply of fuel and a supply of oxygen is fed to a preoxidation zone beneath the precalcining zone and raw material is fed into an admixing area above the burner with a deflector preventing particles from falling down into the preoxidation zone with the fuel being partially oxidized so that controlled heating and controlled oxidation occurs in the precalcining zone.
    Type: Grant
    Filed: March 9, 1976
    Date of Patent: January 3, 1978
    Assignee: Klockner-Humboldt-Deutz Aktiengesellschaft
    Inventors: Kunibert Brachthauser, Hubert Ramesohl, Klaus Beisner, Horst Herchenbach
  • Rapid hardening cement
    Patent number: 4066469
    Abstract: A gypsum-free ultra-rapid hardening Portland Cement ground to a specific surface area of 3000 to 7000 cm.sup.2 /g and containing a minor proportion of an acid salt of an alkali metal, ammonium or organic base.
    Type: Grant
    Filed: October 15, 1976
    Date of Patent: January 3, 1978
    Assignee: The Associated Portland Cement Manufacturers Limited
    Inventors: Leslie Edward Shiel, Kenneth Wilson Jones
  • Well cementing
    Patent number: 4065318
    Abstract: Wells and like borings into the earth's surface, especially those for the production of petroleum and gas, are very well and efficaciously cemented with cement compositions or pastes containing, as their effective gel control and cement set retardation agent, an additive that is a resulfonated, alkaline oxidized, hydrolyzed, partially desulfonated lignosulfonate product.
    Type: Grant
    Filed: March 29, 1976
    Date of Patent: December 27, 1977
    Assignee: American Can Company
    Inventors: William John Detroit, Michael Elliot Sanford
  • Process for the production of cement clinker from fuel shale
    Patent number: 4065321
    Abstract: An argillaceous and/or calcareous material, such as a fuel shale, for example an oil shale, which is capable of yielding a cement clinker, is subjected to mechanical disintegration by the particles formed thereby to repeated acceleration and retardation within a period of less than about 0.05 second, thereby homogenizing and activating them, and then sintering the disintegrated material at a temperature between about 900.degree. and about 1300.degree. C for a period between about 3 and about 10 minutes, to form a cement clinker. Other materials such as SiO.sub.2, CaO and R.sub.2 O.sub.3 (Al.sub.2 O.sub.3 or Fe.sub.2 O.sub.3) may be admixed to improve clinker properties. The sintered clinker may be further subjected to mechanical disintegration in an impact-type disintegration.
    Type: Grant
    Filed: October 29, 1976
    Date of Patent: December 27, 1977
    Inventor: Karl Entzmann
  • System for handling high sulfur materials
    Patent number: 4065320
    Abstract: Sulfur oxides have a strong affinity for free lime and readily form gypsum anhydrite. By utilizing 2200.degree. F. or higher on-gas containing reduced quantities of sulfur to the preheat zone of a material treating apparatus, large quantities of sulfur can be removed from gases evolved in the rotary kiln. Utilizing lower sulfur content on-gas to preheat will substantially improve the ability of the system to lower both sulfur and alkali levels in the clinker. Substantially free lime in the form of fines is introduced into the kiln off-gas stream to form gypsum anhydrite which is removed and has the potential to be utilized as a by-product. Essentially all of the remaining gaseous sulfur that has not been absorbed by the lime bearing dust is absorbed by the free lime in the pellets in the preheat zone of a material treating apparatus.
    Type: Grant
    Filed: May 13, 1975
    Date of Patent: December 27, 1977
    Assignee: Allis-Chalmers Corporation
    Inventors: Glenn A. Heian, Robert F. Kohl
  • Method for the thermal treatment of finely granular material, particularly for the calcining of cement
    Patent number: 4062691
    Abstract: A process and mechanism for thermally treating fine ground material for the calcining of cement in stages which passes finely ground calcareous and argillaceous material into a vertical chamber to enter a deacidifying zone, supplying fuel to the vertical chamber with a supply of oxygen so that the fuel is partially oxidized prior to mixing with the material and the fuel, oxygen and material are supplied so that the material is deacidified in the range of 50% to 80%, passing exhaust gases from a kiln into the deacidifying zone, and passing material from the deacidifying zone through a cyclone separator to separate the gases and deliver the preheated material to the kiln for completion of the burning process.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: December 13, 1977
    Assignee: Klockner-Humboldt-Deutz Aktiengesellschaft
    Inventors: Kunibert Brachthauser, Hubert Ramesohl, Klaus Beisner, Horst Herchenbach
  • Process for manufacturing hydraulic concretes, mortars and cement slurries of improved properties
    Patent number: 4062822
    Abstract: Process for preparing hydraulic cement slurries, concretes and mortars by admixing the usual components of said products with a hardenable fluidifying agent including in combination an aqueous solution of at least one epoxy-resin in a proportion from 0.5 to 10% of the cement weight, a hardening agent, an aqueous solution of melamine-formaldehyde at a 5 to 30% concentration thereof, in an amount from 1 to 10% of the cement weight and, optionally, an additional amount of elastomer latex in a proportion from 1 to 20% of the cement weight.
    Type: Grant
    Filed: May 16, 1975
    Date of Patent: December 13, 1977
    Assignee: Institut Francais du Petrole
    Inventor: Jean Lesage
  • Refractory linings
    Patent number: 4061501
    Abstract: A refractory material contains a small quantity of colloidal silica. The colloidal silica increases the resistance of the material against aggressive slags.
    Type: Grant
    Filed: October 6, 1975
    Date of Patent: December 6, 1977
    Assignee: Hoganas AB
    Inventors: Paul Lennart Ivarsson, Peter Harry Havranek
  • Production of fast-setting bonded aggregate structures
    Patent number: 4059455
    Abstract: A method of preparing a fast-setting concrete or the like by mixing, with an aggregate containing magnesia, ammonium phosphates in aqueous solution, wherein the composition of the phosphates is about 20% to 58% by weight polyphosphates, balance orthophosphate.
    Type: Grant
    Filed: June 17, 1976
    Date of Patent: November 22, 1977
    Assignee: Republic Steel Corporation
    Inventors: Robert W. Limes, Robert O. Russell
  • Cementitious composition
    Patent number: 4058406
    Abstract: A cementitious composition for the molding of relatively light-weight, heat-insulative, nailable, structural units such as bricks, blocks, roof decking, etc. The composition comprises an inorganic cementitious settable admixture within which is incorporated a significant proportion of a waste polyethylene consisting substantially of polyethylene derived from the reclamation of cellulosic fiber from fiberboard to which a polyethylene coating material was previously adhered. Additionally, the composition comprises a significant proportion of industrial waste commonly termed stack dust and/or fly ash as aggregate.
    Type: Grant
    Filed: January 30, 1976
    Date of Patent: November 15, 1977
    Inventor: Dante A. Raponi
  • Hydraulic cement mixes and process for improving hydraulic cement mixes
    Patent number: 4058407
    Abstract: A hydraulic cement mix including hydraulic cement, such as Portland type or high alumina cement, aggregate, sufficient water to effect hydraulic setting of the cement, and an additive comprising the fruit of the carob tree, Ceratonia siliqua, wherein the additive is present in an amount sufficient to increase the compressive strength of the mix when hardened. The additive may take many forms, but is preferably selected from the group comprising raw or roasted, carob pods or beans, extracts of the pods or beans, or combinations thereof and is present in an amount of up to about 0.25% based upon the weight of the cement, preferably between about 0.1% by weight and 0.1% by weight based upon the weight of the cement, with between 0.01% by weight and 0.05% by weight based upon the weight of the cement being an additional preferred range.
    Type: Grant
    Filed: December 1, 1976
    Date of Patent: November 15, 1977
    Assignee: Martin Marietta Corporation
    Inventor: James A. Ray
  • Adsorbent material
    Patent number: 4058483
    Abstract: An adsorptive material, useful for removing substances from gases and liquids is in discrete pieces, each comprising an adsorptive carbon and an inorganic adsorptive oxide in a mutual weight proportion between 1:5 and 5:1, and the discrete pieces having been formed by a wet method.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: November 15, 1977
    Assignee: Imperial Chemical Industries Limited
    Inventor: Richard George Cleveland Henbest
  • Sintered ceramic dielectric body
    Patent number: 4058404
    Abstract: A sintered ceramic dielectric body is provided which exhibits a high dielectric constant as well as a low dielectric loss and almost no variation in the dielectric constant and the dielectric loss with respect to a wide variation of an applied high AC or DC voltage, respectively. The ceramic dielectric composition consists essentially, by weight, of approximately 18 to 70% of strontium titanate (SrTiO.sub.3), approximately 4 to 75% of barium titanate (BaTiO.sub.3), 2.5 to 17.4% of bismuth oxide (Bi.sub.2 O.sub.3) and 1.7 to approximately 20% of titanium oxide (TiO.sub.2); the ratio by mole of the titanium oxide (TiO.sub.2) to the bismuth oxide (Bi.sub.2 O.sub.3) being within the range from approximately 1 to 18.
    Type: Grant
    Filed: September 16, 1975
    Date of Patent: November 15, 1977
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Shinobu Fujiwara, Hitoshi Tanaka
  • Pumpable cement grout and additive
    Patent number: 4058405
    Abstract: A pumpable cement grout or mortar is described having improved early compressive strength, controllable set times, and desirable expansion properties which consist essentially of cement, sand, sodium chloride, aluminum powder and water. The grout or mortar also may contain one or more dispersing agents, thickeners, and an inert filler. It has been found that the workability of cement grout or mortar compositions containing the above ingredients does not depend necessarily upon the amount of water only as in prior art cements, and the cements of the invention exhibit reduced segregation, bleeding and shrinking tendencies resulting in higher strengths and increased durability. A process for preparing the cement compositions of the invention also is described.
    Type: Grant
    Filed: July 9, 1976
    Date of Patent: November 15, 1977
    Assignee: Grout Supply Company
    Inventors: Joseph T. Snyder, Richard E. Huffman
  • Process for preparing frost resistant concrete
    Patent number: 4057526
    Abstract: A process is provided for making frost resistant cement products having improved 28 day compressive strengths wherein a gas is included in the product by substantially uniformly dispersing hollow gas filled synthetic polymeric spheres in the cement mixture prior to setting thereof. The invention also provides a frost resistant cement product having from about 0.01 to about 0.1% by weight based on the weight of cement of synthetic polymer spheres filled with air and having a diameter of from about 10 to about 100 .mu.m substantially uniformly dispersed therein.
    Type: Grant
    Filed: May 6, 1976
    Date of Patent: November 8, 1977
    Assignee: Akzo N.V.
    Inventor: Poppe de Rook
  • Plastic refractory composition suitable for placement by vibrating and the use thereof
    Patent number: 4056398
    Abstract: High alumina, phosphate containing refractory plastic composition suitable for placement by mechanical vibration using molding techniques are maximized in density and shelf life while requiring minimum water content for ease of placement through the combining of a relatively low content of bentonite with a small addition of tetrasodium pyrophosphate. The resulting compositions are easy to place by vibration with minimal tendency to slump on removal of forms.
    Type: Grant
    Filed: March 31, 1977
    Date of Patent: November 1, 1977
    Assignee: Chicago Fire Brick Company
    Inventors: Harold L. Rechter, James R. Haligarda