Patents by Inventor Stefan Pieh

Stefan Pieh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6340645
    Abstract: Intumescent laminate with high heat transfer resistance composed of a glass-fiber web or glass-fiber fabric each of which has been coated with a four-component intumescent composition comprising a) a phosphate compound, b) a melamine compound, c) a polyol and d) an inorganic framework-forming compound.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: January 22, 2002
    Assignee: DSM Fine Chemicals Austria Nfg GmbH & CoKG
    Inventors: Heinz Horacek, Stefan Pieh
  • Patent number: 6043329
    Abstract: Copolymers which are obtainable by reacting acrylic monomers with monomers of the following formula:R.sub.4 --O--R.sub.5 --CO--NH--R.sub.6wherein R.sub.4 represents H or a group of the following formulae: ##STR1## R.sub.5 represents an oxyalkenyl group of the following formulae:--(CHR.sub.1 --CH.sub.2 --O).sub.m -- or --(CHR.sub.1 --CH.sub.2 --O).sub.m1 --(CH.sub.2 --CH.sub.2 --O).sub.n --R.sub.6 represents a C.sub.1 - to C.sub.8 -alkyl group, a C.sub.5 - to C.sub.7 -cycloalkyl group, or a phenyl group. The copolymers are very useful as additives or admixtures for improving the properties of construction materials and of dispersions.
    Type: Grant
    Filed: April 7, 1998
    Date of Patent: March 28, 2000
    Assignee: Cement Intellectual Property Ltd. (CIP)
    Inventors: Agostino Lepori, Stefan Pieh, Manfred Akstinat, Fritz Burkhardt
  • Patent number: 5405425
    Abstract: Method of conditioning soils, in which copolymers which are composed of acrylamide and/or methacrylamide, a sulphonyl-containing, substituted acrylamide or methacrylamide, a multi-functional, water-soluble vinyl compound and, if appropriate, carboxyl-containing comonomers are added to the soils as soil conditioners.
    Type: Grant
    Filed: January 13, 1992
    Date of Patent: April 11, 1995
    Assignee: Chemie Linz Gesellschaft m.b.H.
    Inventors: Stefan Pieh, Johann Krammer
  • Patent number: 5005771
    Abstract: Process for the continuous drying of hydrophilic polymer gels in a cylindrical dryer with a high speed rotor which conveys the material to be dried through the dryer and prevents agglomeration.
    Type: Grant
    Filed: January 25, 1990
    Date of Patent: April 9, 1991
    Assignee: Chemie Linz Gesellschaft m.b.H.
    Inventors: Stefan Pieh, Gerhard Willert
  • Patent number: 4725665
    Abstract: Use of salts of water-soluble naphthalenesulfonic acid formaldehyde condensates having a molar formaldehyde/naphthalenesulfonic acid ratio of 1.2:1 to 3:1 and an intrinsic viscosity of 0.01 to 0.15 dl/g, as an additive to inorganic binders for improving the flowability, and a structural material prepared using binders modified in this manner.
    Type: Grant
    Filed: July 23, 1986
    Date of Patent: February 16, 1988
    Assignee: Chemie Linz Aktiengesellschaft
    Inventors: Stefan Pieh, Christian Werenka
  • Patent number: 4707508
    Abstract: Concentrated aqueous solutions of sulfo-containing melamine-formaldehyde condensates containing hydantoin derivatives to prolong their shelf life.These melamine-formaldehyde condensates are predominantly used as additives in inorganic binders to improve their flow and strength properties.
    Type: Grant
    Filed: September 30, 1986
    Date of Patent: November 17, 1987
    Assignee: Chemie Linz Aktiengesellschaft
    Inventors: Stefan Pieh, Johann Krammer
  • Patent number: 4272430
    Abstract: Additive for inorganic binders, such as cements, calcium sulfate, magnesia cement and the like, which comprises, as the active ingredient, a water-soluble salt of a mixed resin consisting of an aromatic aminosulfonic acid, urea, melamine and formaldehyde, the molar ratio, in the resin, of aromatic aminosulfonic acid to the total amount of melamine and urea being (0.2 to 1.0):1.0 and the molar ratio of melamine to urea being from 0.75:0.25 to 0.30:0.70, and also building materials, having increased flowability and early strength, in which this additive is present.
    Type: Grant
    Filed: June 8, 1979
    Date of Patent: June 9, 1981
    Assignee: Chemie Linz Aktiengesellschaft
    Inventors: Stefan Pieh, Hubert Czepel