Patents by Inventor Michael Piepho

Michael Piepho 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).

  • Water-dispersible allyl urethanes and their use for the production of paints
    Patent number: 5089586
    Abstract: Improved water-dispersible allyl urethanes are obtainable by reaction of a polyglycol mixture with a hydroxyallyl compound and an isocyanate containing at least two NCO groups, the allyl urethane being nonionic.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: February 18, 1992
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Michael Piepho, Lutz Hoppe, Erhard Luhmann
  • Desensitized nitrocellulose mixtures
    Patent number: 5071892
    Abstract: Improved nitrocellulose mixtures contain a polyol as the desensitizing agent, the polyol being a solvent for nitrocellulose, soluble in water to a maximum of 10% at 20.degree. C. and non-volatile.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: December 10, 1991
    Assignee: Wolff Walsrode AG
    Inventors: Lutz Hoppe, Klaus Szablikowski, Michael Piepho
  • Cellulose ester/polymer combinations, and their preparation and use
    Patent number: 5011874
    Abstract: Improved cellulose ester-polymer combinations contain a cellulose ester A and at least one polymerized monomer B of the following formula ##STR1## wherein the substituents have the meaning given in the description and wherein the particles of the combinations are essentially 0.1 to 10 mm in size.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: April 30, 1991
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Lutz Hoppe, Wolfgang Koch, Erhard Luhmann, Michael Piepho
  • Aqueous cellulose ester dispersions and their preparation
    Patent number: 4970247
    Abstract: Improved cellulose ester dispersions in the aqueous phase contain dispersed particles which contain cellulose esters, a polymerized monomer A having a polymerizable double bond and a polymerized monomer B having at least two polymerizable double bonds.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: November 13, 1990
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Lutz Hoppe, Wolfgang Koch, Erhard Luhmann, Michael Piepho
  • Polymerizable water soluble binders
    Patent number: 4933428
    Abstract: Water soluble, polymerizable binders suitable for surface coating contain co-condensed residues of at least two polyalkylene glycols with different molecular weights, an alkoxylated polyol, a polycarboxylic acid and an optionally substituted acrylic acid.
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: June 12, 1990
    Assignee: Wolff Walsrode AG
    Inventors: Michael Piepho, Erhard Luhmann, Lutz Hoppe, Klaus Szablikowski