Patents by Inventor Juergen Gehlhaus

Juergen Gehlhaus 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).

  • Photosensitive hydroxylalkylphenones
    Patent number: 4721734
    Abstract: Compounds of the formula ##STR1## wherein R.sub.1 is hydrogen, chlorine, phenyl, dialkylamino of 2-4 carbon atoms or alkyl or alkoxy each of up to 18 carbon atoms; R.sub.2 is hydrogen, chlorine, bromine or alkyl or alkoxy each of up to 4 carbon atoms; R.sub.3 and R.sub.4, which can be the same or different, each is hydrogen or alkyl of up to 6 carbon atoms; R.sub.5 is hydrogen or alkyl or alkanoyl each of up to 4 carbon atoms; and R.sub.6 is hydrogen or methyl, with the proviso that not all of R.sub.1 to R.sub.6 simultaneously are hydrogen, are effective photosensitizers, especially for photopolymerization of unsaturated compounds and for hardening of printing dyes.
    Type: Grant
    Filed: August 31, 1984
    Date of Patent: January 26, 1988
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Juergen Gehlhaus, Manfred Kieser
  • U.V. Absorbing cosmetic compositions
    Patent number: 4489057
    Abstract: Cosmetic compositions containing dibenzoylmethane compounds of the formula ##STR1## wherein R and R.sup.1 are straight-chain or branched alkyl of 1-8 carbon atoms, n an integer from 0-3 and n' an integer from 1-3, dissolved in the fatty components of said composition have superior sun-protection efficiency.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: December 18, 1984
    Assignee: Merck Patent Gesellschaft mit beschraenkter Haftung
    Inventors: Reiner Welters, Juergen Gehlhaus, Gernot Moeschl
  • Photosensitive hydroxyalkylphenones
    Patent number: 4477681
    Abstract: Compounds of the formula ##STR1## wherein R.sub.1 is hydrogen, chlorine, phenyl, dialkylamino of 2-4 carbon atoms or alkyl or alkoxy each of up to 18 carbon atoms; R.sub.2 is hydrogen, chlorine, bromine or alkyl or alkoxy each of up to 4 carbon atoms; R.sub.3 and R.sub.4, which can be the same or different, each is hydrogen or alkyl of up to 6 carbon atoms; R.sub.5 is hydrogen or alkyl or alkanoyl each of up to 4 carbon atoms; and R.sub.6 is hydrogen or methyl, with the proviso that not all of R.sub.1 to R.sub.6 simultaneously are hydrogen, are effective photosensitizers, especially for photopolymerization of unsaturated compounds and for hardening of printing dyes.
    Type: Grant
    Filed: August 16, 1982
    Date of Patent: October 16, 1984
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Juergen Gehlhaus, Manfred Kieser