Patents by Inventor Hans Dahmen

Hans Dahmen 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).

  • Halogen-free, flame-retardant polyurethane foams
    Publication number: 20070021516
    Abstract: The present invention relates to flame-retardant polyurethane foams which comprise, as flame retardant, halogen-free bisphosphates free from hydroxy groups.
    Type: Application
    Filed: July 18, 2006
    Publication date: January 25, 2007
    Inventors: Jan-Gerd Hansel, Heiko Tebbe, Hans Dahmen
  • Phosphorus-containing compounds based on 1-hydroxypropane-1, 3-diphosphonic acid
    Patent number: 6090345
    Abstract: The present invention relates to phosphorus-containing compounds based on 1-hydroxypropane-1,3-diphosphonic acid and to the acid itself of general formula (I) ##STR1## in which M.sup.1, M.sup.2, M.sup.3, M.sup.4 and M.sup.5, independently of one another, each denote a radical from the series hydrogen, alkali metal, an equivalent of ammonium, alkyl- or hydroxyalkyl-substituted ammonium,a process for the preparation thereof, novel intermediates and the use thereof as a corrosion inhibitor, scale inhibitor and as a flame retardant.
    Type: Grant
    Filed: January 29, 1999
    Date of Patent: July 18, 2000
    Assignee: Bayer AG
    Inventors: Christoph Holzner, Armin Spaniol, Hans Dahmen
  • Process for the production of aryl phosphonyl compounds
    Patent number: 4391761
    Abstract: The present invention relates to a new process for the production of aryl phosphonyl compounds by the catalytic rearrangement of aryloxy phosphines in the presence of aromatic bromine compounds and zero-valent nickel.
    Type: Grant
    Filed: June 12, 1981
    Date of Patent: July 5, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Dieter Block, Hans Dahmen