With Portland Cement Patents (Class 162/154)
  • Patent number: 6855404
    Abstract: A laminate of inorganic sheet and polyester resin having an overall thickness of 5 to 25 mils and having an elongation at break in both the cross direction and machine direction of at least 25%.
    Type: Grant
    Filed: March 13, 2003
    Date of Patent: February 15, 2005
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: David Wayne Anderson, Dariusz Wlodzimierz Kawka
  • Patent number: 6777103
    Abstract: A fiber cement composite material providing improved rot resistance and durability, the composite material incorporating biocide treated fibrous pulps to resist microorganism attacks. The biocide treated fibers have biocides attached to inner and outer surfaces of individualized fibers to protect the fibers from fungi, bacteria, mold and algae attacks. The biocides selected have strong affinity to cellulose and do not interfere with cement hydration reactions. This invention also discloses the formulation, the method of manufacturing and the final fiber cement products using the biocide treated fibers.
    Type: Grant
    Filed: October 2, 2001
    Date of Patent: August 17, 2004
    Assignee: James Hardie Research Pty Limited
    Inventors: Donald J. Merkley, Caidian Luo
  • Patent number: 5851354
    Abstract: The object of the present invention is to improve the overall strength and interlaminar strength of a compact (green sheet) before hydrothermal reaction by using alunites, alums and aluminum sulfate having a specified specific surface area which does not require the addition of a setting retarder or a curing accelerator together with a curing agent in order to provide a method of manufacture for a lightweight calcium silicate board which does not give rise to interlaminar peeling or bursting during hydrothermal reaction and to provide such a calcium silicate board. The method of manufacture for a calcium silicate board according to the present invention is characterized by use of one or more species selected from alunites and alums with a Blaine specific surface area of 4000 cm.sup.2 /g or more or aluminum sulfate with a Blaine specific surface area of 2000 cm.sup.2 /g or more.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: December 22, 1998
    Assignee: Ask Corporation
    Inventors: Masato Sakiyama, Takuya Asami, Tomoki Iwanaga, Yasuhide Oshio, Masaaki Oda
  • Patent number: 5681428
    Abstract: An inorganic board consisting of a cured base mat and a cured surface mat is manufactured by forming a surface mat by the dry method on a base mat formed by a paper making method, embossing the composite mat, and curing the embossed composite mat. Ridges each having an enlarged top are formed on the surface of the base mat when a plural number of single mats formed by the paper making method are rolled and laminated around a making roll having a surface on which a plural number of ring grooves are formed. The ridges of the base mat engage the surface mat since each ridge has an enlarged top to improve the interlaminate strength between a cured base mat and a cured surface mat of the resulting inorganic board.
    Type: Grant
    Filed: February 7, 1996
    Date of Patent: October 28, 1997
    Assignee: Nichiha Corporation
    Inventors: Shiro Nakajima, Masaki Kanai
  • Patent number: 4812204
    Abstract: The invention relates to novel borated asbestos fibers which possess improved filtration properties.
    Type: Grant
    Filed: July 24, 1987
    Date of Patent: March 14, 1989
    Assignee: Ceram-Sna, Inc.
    Inventors: Pierre Delvaux, Normand Lesmerises
  • Patent number: 4464225
    Abstract: A method and machine for fabricating building boards or the like, especially asbestos cement plates, contains a turbulence device having at least one channel with a step-shaped widened portion. The channel either has the form of a slot extending over the entire width of the machine or there are provided a series of cylindrical bores forming essentially parallel channels. An intermediate chamber or compartment merges with the channel or channels. Leading from the intermediate chamber is an outlet gap to the upper surface of a felt band.
    Type: Grant
    Filed: May 7, 1982
    Date of Patent: August 7, 1984
    Assignee: Bell Maschinenfabrik AG
    Inventors: Alfred Bubik, Oskar Kummer, Burkard Rosenberg
  • Patent number: 4433020
    Abstract: A sheet-like material having excellent fire resistance and bending workability comprises 80 to 97% by weight of a non-flammable fibrous substance, and 3 to 20% by weight of a binder consisting essentially of a thermoplastic resin. The fibrous substance is orientated at an angle of 3.degree. to 80.degree.. The material has an intermediate layer containing at least 2% by weight of the binder and at least 25% of the average quantity of the binder in the material. A heat insulating material comprising such sheet-like materials is also disclosed. The sheet-like material, and the heat insulating material are manufactured by a wet sheet forming process in which a slurry containing the fibrous substance and the binder is fed to a carrier net or sheet at an angle of 5.degree. to 60.degree. thereto, whereby the fibers are orientated. Alternatively, the slurry is fed to the carrier net or sheet at an angle of 20.degree. to 45.degree., while a fluid is blown into the slurry to create turbulence therein.
    Type: Grant
    Filed: October 21, 1982
    Date of Patent: February 21, 1984
    Assignee: Kuraray Co., Ltd.
    Inventors: Hiroshi Narukawa, Rentaro Tada, Yasuhira Takeuchi, Osamu Ohara
  • Patent number: 4369054
    Abstract: A composition comprising an admixture of pulped fibers and a slag characterized by an open pore structure.
    Type: Grant
    Filed: November 27, 1978
    Date of Patent: January 18, 1983
    Inventors: Leavie J. Shinholster, Jr., Charles H. Tully-Wilkins
  • Patent number: 4287020
    Abstract: A flexible mat of randomly-oriented, interwoven chyrsotile asbestos fibers, having the appearance of a flake when flattened and spread out to "open" the fibers without separating the individual fibers and without significantly reducing their natural length, have been found to provide a reinforcing agent of extraordinary strength.
    Type: Grant
    Filed: November 29, 1979
    Date of Patent: September 1, 1981
    Inventor: Irving F. Moore
  • Patent number: 4259146
    Abstract: Asbestos fibres having excellent properties in resin reinforcement are produced by controlled heat treatment of a coarse fraction of chrysotile asbestos fibres.
    Type: Grant
    Filed: July 19, 1979
    Date of Patent: March 31, 1981
    Assignee: Ontario Research Foundation
    Inventors: Roger W. Glass, Richard A. Kuntze
  • Patent number: 4221633
    Abstract: Waste water effluent from online production machinery and/or clean-off water from shut-down machinery is deposited in a settling tank in which the solids settle out. Water, relatively clear of the solids, is returned to the production plant. A slurry containing a high concentration of these solids is, depending on the percentage of solids, either returned to the production machinery via a slurry tank or returned to the settling tank for further concentration. The degree of concentration of solids in the slurry tank is carefully controlled in order to permit the addition of these otherwise wasted solids to the virgin asbestos-cement slurry in the various production machineries. This addition of the otherwise wasted solids is carefully monitored at each of the production machinery installations in order to provide proper quality control of the product produced thereby.
    Type: Grant
    Filed: April 4, 1978
    Date of Patent: September 9, 1980
    Assignee: Johns-Manville Corporation
    Inventor: Juris Laipenieks
  • Patent number: 4192707
    Abstract: Asbestos fibres having excellent properties in resin reinforcement are produced by controlled heat treatment of a coarse fraction of chrysotile asbestos fibres.
    Type: Grant
    Filed: December 29, 1977
    Date of Patent: March 11, 1980
    Assignee: Ontario Research Foundation
    Inventors: Roger W. Glass, Richard A. Kuntze
  • Patent number: 4184906
    Abstract: Laminated slabs superficially bonded together are prepared by autoclaving a vertically compressed stack including a plurality of the sheets when initially set but not finally cured and having a polyethylene or like plastic film-like layer sandwiched between each pair of the sheet surfaces to be bonded together. A layer of material other than asbestos-cement may be sandwiched between the asbestos-cement sheets, for example, metal foil, to make the slab moisture-impervious or an array of filaments or wire-mesh material as reinforcement may be used.
    Type: Grant
    Filed: April 28, 1978
    Date of Patent: January 22, 1980
    Assignee: James Hardie & Coy Pty. Limited
    Inventor: Jason C. Young
  • Patent number: 4180433
    Abstract: The filtration rate of asbestos-cement slurries formed from chrysotile asbestos fibres is improved by controlled heat treatment of the fibres at a temperature of about 400.degree. to about 600.degree. C. without loss of water of crystallization and fibre strength. The improved filtration rate allows an increased rate of production of asbestos-cement products.
    Type: Grant
    Filed: August 15, 1977
    Date of Patent: December 25, 1979
    Assignee: Ontario Research Foundation
    Inventors: Roger W. Glass, Richard A. Kuntze
  • Patent number: 4149930
    Abstract: An improvement in the method and apparatus for fabricating asbestos-cement boards, wherein a felt band coated with fiber fleece is fed to a pair of press rollers in nip relationship and wherein the coating of the felt band with fiber fleece is effected by wet deposition on the felt band and by suction from the side opposite same.The fiber fleece obtained by wet deposition on the felt band following the deposition is condensed and dehydrated by a system consisting of a sieve cylinder and of an associated suction roller operating in nip relationship.
    Type: Grant
    Filed: April 10, 1978
    Date of Patent: April 17, 1979
    Assignee: Fulgurltwerke Seelze und Eichriede in Luthe bel Hannover Adolf Oesterheld
    Inventors: Gunter Exner, Leon G. Rzepka
  • Patent number: 4132590
    Abstract: A method of producing an inorganic substance board, wherein after preparation, such as by use of paper making process, the board is hardened in an autoclave with saturated steam at a high temperature, high pressure and for a suitable length of time, and after hardening, subjecting the board to one or more drying cycles comprising a vacuum treatment at 60 to 300 Torrs, for a suitable length of time to enable the core of the board to reach a suitable temperature, the application of saturated steam at 2 to 12 Kg/cm.sup.2 pressure and 120 to 190.degree. C temperature for a period of time sufficient to allow the core to reach a suitable temperature. The number of cycles is preferably 10 or less. Advantageously, the inventive drying treatment prevents efflorescence and warping of the boards.
    Type: Grant
    Filed: March 23, 1978
    Date of Patent: January 2, 1979
    Assignee: Kubota, Ltd.
    Inventors: Hirofumi Yamada, Noboru Takaki, Michio Masuda
  • Patent number: 4085001
    Abstract: A process for preparing glass fiber-reinforced cement sheets by dewatering a slurry wherein at least one member selected from asbestos, cotton, flax, hemp, wool, or silk fibers is added to the aqueous cement-glass fiber slurry. The sheets so produced have increased bending strengths and improved peeling resistance.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: April 18, 1978
    Assignee: Asahi Glass Company, Ltd.
    Inventors: Tadashi Fukuwatari, Kiyotaka Mishima, Hiroshi Ichimura, Hideaki Kurihara
  • Patent number: 3954556
    Abstract: An inorganic composition useful as material for Lehr rolls at temperatures above 500.degree.C consists essentially of 15-45% chrysotile asbestos, 40-75% talc component and 2-35% inorganic binder. The composition is also used in manufacturing millboard by forming a water slurry of said composition and transferring said slurry to a rotating screen cylinder, then to a moving belt and then to a rotating drum upon which layers of said slurry accumulate upon each other and are thereafter slit, dried and formed into a flat sheet.
    Type: Grant
    Filed: June 10, 1974
    Date of Patent: May 4, 1976
    Assignee: Johns-Manville Corporation
    Inventors: Fred L. Jackson, John Wilmer Axelson