Patents by Inventor Hans Grassner

Hans Grassner 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).

  • Preparation of aqueous solutions or fine aqueous dispersions of polyenyltriarylphosphonium salts
    Patent number: 4182731
    Abstract: Aqueous solutions of polyenyltriarylphosphonium salts are prepared from solutions of the corresponding polyenyltriarylphosphonium salts in organic solvents by driving off the solvent with steam, part of the steam being allowed to condense. Some of the said triarylphosphonium salts may be used directly as pesticides while others are used as intermediates for organic syntheses, especially in the carotinoid field.
    Type: Grant
    Filed: June 5, 1978
    Date of Patent: January 8, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernhard Schulz, Paul Grafen, Hans-Ulrich Scholz, Hans Grassner, Werner Reif
  • Manufacture of symmetrical carotenoids
    Patent number: 4127455
    Abstract: Symmetrical carotenoids are manufactured from the molecular halves thereof by a process wherein phosphonium salts of the molecular halves of these symmetrical carotenoids are oxidized electrochemically in a solvent and in the presence of a base, causing the molecular halves to dimerize, with elimination of substituted phosphine oxide.
    Type: Grant
    Filed: July 20, 1977
    Date of Patent: November 28, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernhard Schulz, Hans Grassner, Peter Jaeger, Heinz Nohe