Patents by Inventor Claudia Hamel

Claudia Hamel 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: 5723537
    Abstract: Pigment pastes are produced by pasting or blending one or several pigments and/or fillers in a paste resin based on a polyester oligomer polyacrylate which is obtainable by radical polymerisation ofA) 80-50 wt % ofa) one or several hydroxyfunctional acrylic acid esters and/or methacrylic acid esters andb) one or several monofunctional ethylenically unsaturated acids, as well as, optionally,c) one or several alpha,beta-ethylenically unsaturated monomers without functional groups inB) 20-50 wt % of one or several hydroxyfunctional polyester oligomers with a calculated molecular weight of 200-1000, a hydroxy number of 280-600 and an acid number of 0-1.5, obtainable by polycondensation of one or several diols, polyols and dicarboxylic acids and derivatives thereof,whereby the monomers a), b) and c) are used in such quantities as to ensure that the polyester oligomer polyacrylate obtained has a hydroxyl number of 150-390 and an acid number of 16-40.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: March 3, 1998
    Assignee: Herberts Gesellschaft mit beschrankter Haftung
    Inventors: Gerda Bajorat, Claudia Hamel, Hartmut Kern