Calcium Sulfate Containing Patents (Class 106/650)
  • Patent number: 9169160
    Abstract: An object of the present invention is to provide a high-expansion gypsum composition in which the expansion coefficient of a general purpose dental gypsum material or the like is simply and effectively improved to such an extent that has never been achieved with conventional technologies without using any special material by adding an inexpensive additive even in a small addition amount, and furthermore another object of the present invention is to provide a high-expansion gypsum composition the setting expansion coefficient of which is appropriately controlled so that the contraction of a resin to be used can be precisely dealt with, the high-expansion gypsum composition being useful for manufacturing a reproduction model to be used in manufacturing a “non-clasp denture” having no problem in, for example, occlusion (adaptability).
    Type: Grant
    Filed: August 22, 2013
    Date of Patent: October 27, 2015
    Assignee: YOSHINO GYPSUM CO., LTD.
    Inventors: Yusuke Ichino, Masato Yoshikane
  • Patent number: 8668770
    Abstract: Disclosed is a dental cement composition made up of ingredients comprising the nanoparticles of dicalcium and tricalcium silicate, bismuth oxide, gypsum, zeolite and strontium carbonate. The dental cement can also be used as bone cement, pulpotomy agent, pulp capping material, dental implant material, perforation repair material, and root-end filling material.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: March 11, 2014
    Inventors: Mohammad Ali Saghiri, Mehrdad Lotfi, Houtan Aghili
  • Publication number: 20130326985
    Abstract: An aqueous gypsum plaster-cement composition comprises a hydraulic binder consisting of calcined gypsum and hydraulic cement in a weight ratio of from about 4:1 to about 2:1, an aggregate which comprises sand, a foam, a perlite, rice hulls or a mixture thereof, a superplasticizer comprising an air entraining agent, a retarder, and water in an amount of from about 0.4 to about 0.75 parts by weight per part of binder, with the proviso that the gypsum plaster-cement composition contains essentially neither a pozzolana nor lime. The use thereof, a method of constructing buildings using this composition and the buildings obtainable in this way are also described.
    Type: Application
    Filed: September 8, 2011
    Publication date: December 12, 2013
    Inventors: Hubert Lichtinger, Bernd Bruno Winfried Eck
  • Publication number: 20110179975
    Abstract: The invention relates generally to a cement or gypsum composition having improved properties, which is prepared by incorporating an enzyme into a cement material such as a cement, mortar, or concrete, or into a gypsum product. The invention also relates to methods of manufacturing improved cement compositions and gypsum products, methods of improving the compressive strength of cement compositions and gypsum products, and methods of reducing the cost of such compositions by enabling the use of less expensive aggregates in the manufacturing process. More specifically, the invention relates to a cement composition or a gypsum composition, optionally including at least one aggregate and optionally including at least one pozzolan, comprising a cement material or gypsum optionally including aggregate(s) and pozzolan(s) having blended therein an enzyme.
    Type: Application
    Filed: April 11, 2011
    Publication date: July 28, 2011
    Inventor: Josef Atoon
  • Publication number: 20110056409
    Abstract: The present invention relates to a setting retarder for compounds that set hydraulically, containing at least one at least simple adduct and/or condensate, the retarder being produced by the reaction of at least one protein hydrolysate, one pure amino acid, amino acid mixture, and/or the hydrochlorides thereof having at least one mono-, di-, oligo- and/or polycarboxylic acid which is not derived from an amino acid, and/or a carboxylic acid derivative derived therefrom, wherein the carboxylic acid is selected from a group including carboxylic acid anhydrides, carboxylic acid halogenides, and/or carboxylic acid active esters.
    Type: Application
    Filed: April 9, 2009
    Publication date: March 10, 2011
    Inventors: Maria Winkler, Franz Etschmann
  • Patent number: 6800128
    Abstract: A method and composition is provided using whey protein as a retarder in a cementing composition for use in cementing operations in a subterranean zone penetrated by a well bore.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: October 5, 2004
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Bach Dao, Marcel Rietjens, Jan Pieter Vijn
  • Publication number: 20030000428
    Abstract: The present invention provides improved foamed well cement slurries, additives and methods. The foamed well cement slurries are basically comprised of a hydraulic cement, sufficient water to form a pumpable slurry, sufficient gas to form a foam and an effective amount of an additive for foaming the slurry comprised of hydrolyzed keratin.
    Type: Application
    Filed: August 13, 2002
    Publication date: January 2, 2003
    Inventors: Jiten Chatterji, Roger S. Cromwell, Chad R. Brenneis, Bobby J. King, Dennis W. Gray, Frank Zamora
  • Patent number: 6238476
    Abstract: A method of reducing the curing time of drywall joint compound, and thereby reducing the time required to finish drywall joints or to repair plaster walls, includes adding a predetermined amount of a drying agent to a conventional ready-mixed drywall joint compound. The drying agent preferably comprises at least one compound selected from the group of compounds consisting of plaster of Paris, calcium carbonate, gypsum, crystallized silicon dioxide (quartz), Portland cement, perlite, lime, hydroxy ethyl ether of cellulose, polyvinyl alcohol, starch, wood fiber, potassium naphthalene sulfon, aluminum sulfate, sodium citrate, ammonium tartrate, hydrolyzed protein, monosodium phosphate, sodium naphthalene sulfonate, potassium sulfate and various trace materials, or mixtures thereof A sufficient amount of water is added to the drying agent to facilitate mixing the drying agent with the drywall joint compound to form a joint compound mixture.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: May 29, 2001
    Inventor: Mark A. Sprinkle
  • Patent number: 5496441
    Abstract: Deinking by-product from wastepaper recycling operations and pulp mill clarifier sludge are incorporated into drywall or other gypsum-based building products, such as building blocks. The deinking by-product or pulp mill clarifier sludge is diluted and mixed with stucco (calcium sulfate hemihydrate). The resulting slurry preferably is subjected to an initial dewatering, following the on-set of hardening of the gypsum, and drywall or other building product is formed from the dewatered material. A significant loading of fibrous material in the drywall sheet or other gypsum product is achieved using the procedure, imparting improved flexural strength to the product. The preferred procedure also may be used to incorporate virgin or recycled wood pulp into the building product.
    Type: Grant
    Filed: December 29, 1993
    Date of Patent: March 5, 1996
    Assignee: Tran Industrial Research Inc.
    Inventor: Hoc N. Tran
  • Patent number: 5049196
    Abstract: A simple and inexpensive method of wetting a cement or gypsum-bonded fibrous mixture of building materials using water is characterized in that the water is added to the mixture of building materials at least partially in the form of a foam containing at least one foam forming surfactant and at least one foam stabilizer, or is added to the mixture of building materials in combination with at least one foam forming surfactant and at least one foam stabilizer prior to foam formation, and then at least partially foamed in situ, such that a sufficient quantity of water is present in the mixture to provide a final mixture exhibiting a powdery-crumbly consistency.
    Type: Grant
    Filed: April 20, 1989
    Date of Patent: September 17, 1991
    Assignee: Maschinenfabrik Gustav Eirich
    Inventor: Hans B. Ries