Mineral Patents (Class 162/145)
  • Inorganic composition for high temperature use and method of forming a millboard therefrom
    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
  • Mineral wool paper
    Patent number: 3952130
    Abstract: A paper product comprising mineral fibers and a nonfibrous, highly refined gel binder, the product having a thickness no greater than about 0.080 inches and an apparent specific gravity of between about 0.25 and about 0.85. The product may be a sheet no thicker than about 0.012 inches, or a paperboard.
    Type: Grant
    Filed: July 17, 1974
    Date of Patent: April 20, 1976
    Assignee: United States Gypsum Company
    Inventor: Stephen G. Nason
  • Process for preparing gypsum board
    Patent number: 3951735
    Abstract: A gypsum wallboard or plasterboard having a high mechanical strength, especially high impact strength, and a large bulk density is prepared from a mixture consisting essentially of calcined gypsum, cellulosic fibers, asbestos fibers, a setting retardant for the calcined gypsum and water, by withdrawing solid components of the mixture in layer form. A plurality of the thus-obtained layers is piled to form a preform of the desired thickness and pressure-molding the preform under a molding pressure of from 10 to 400 kg/cm.sup.2 to obtain the board product.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: April 20, 1976
    Assignees: Nihon Cement Co. Ltd., Asano Slate Co. Ltd.
    Inventors: Minoru Kondo, Yoshinori Hatou
  • Fibrous insulation and process for making the same
    Patent number: 3935060
    Abstract: An insulative material comprises a random network of ceramic fibers and a binder for holding the fibers together. In addition, it may include a filler material composed of hollow ceramic spheres which locate at the interstices of the fibrous network and increase the strength of the network. The insulative material can withstand extremely high temperatures and thermal shock without degradation, has an extremely low density, has excellent insulating properties, and has reasonably high compressive strength. The material is formed by making a slurry which contains the ceramic fibers, with or without the filler, and the binder; felting the slurry; subjecting the felt so formed to microwave energy for drying; and firing the dried felt at 2300.degree.-3200.degree.F. to increase its strength.
    Type: Grant
    Filed: October 25, 1973
    Date of Patent: January 27, 1976
    Assignee: McDonnell Douglas Corporation
    Inventors: James C. Blome, Chris J. Goodbrake, Marvin Edward O'Brien, Macy W. Vance
  • Casting mold for metals
    Patent number: 3933335
    Abstract: Casting mold for metals, wherein paper-like sheet of carbon or graphite fibers is lined onto the inner surface of the mold to prevent seizure phenomenon between the mold and the cast article.
    Type: Grant
    Filed: March 21, 1972
    Date of Patent: January 20, 1976
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Nobuo Maruyama, Yasuo Sakaguchi