Patents Examined by Jvothsan Venkat
  • Light-stable cosmetic composition
    Patent number: 5718906
    Abstract: A light-stable cosmetic composition for protection from UV rays having a wavelength of between 280 and 400 nm, which contains at least one tetraalkylquercetin in a cosmetically acceptable oil-based medium, and new tetraalkylquercetins.
    Type: Grant
    Filed: March 22, 1995
    Date of Patent: February 17, 1998
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Roland Martin, Ralf Emmert, Thekla Kurz, Gerd Bauer, Ulrich Heywang