Patents by Inventor Hans Pratzer

Hans Pratzer 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).

  • Powdery pearlescent pigment compositions
    Patent number: 4205997
    Abstract: Powdery pearlescent pigment compositions comprising individual particles of a flaky pearlescent pigment coated with 1 to 50 weight percent of a solid polymer, optionally containing wetting agents, fillers, additional coloring agents, UV-absorbers or scenting agents, are produced by combining a suspension of a flaky pearlescent pigment with a solution of a polymer, possibly containing other substances, and subsequently depositing polymer on the pigment flakes. The compositions can be used as pigments in cosmetics and can be stored and shipped as dry powders without loss of properties.
    Type: Grant
    Filed: June 23, 1978
    Date of Patent: June 3, 1980
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Reiner Hesse, Hans Pratzer, Manfred Kieser, Gerhard Edler
  • Powdery pearlescent pigment composition
    Patent number: 4116628
    Abstract: Powdery pearlescent pigment compositions comprising individual particles of a flaky nacreous pigment coated with 1 to 50 weight percent of a solid polymer, optionally containing wetting agents, fillers, additional coloring agents, UV-absorbers or scenting agents, are produced by combining a suspension of a flaky nacreous pigment with a solution of a polymer, possibly containing other substances, and subsequently depositing polymer on the pigment flakes. The compositions can be used as pigments in cosmetics and can be stored and shipped as dry powders without loss of properties.
    Type: Grant
    Filed: January 27, 1977
    Date of Patent: September 26, 1978
    Assignee: E. Merck
    Inventors: Reiner Hesse, Hans Pratzer, Manfred Kieser, Gerhard Edler