Patents by Inventor Heimo Brunnetti

Heimo Brunnetti 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).

  • Process for the manufacture of alkali salts of 3,5-disubstituted 4-hydroxybenzoic acids and their free acids
    Patent number: 4034006
    Abstract: A new process for the preparation of alkalimetal salts of 3,5-substituted 4-hydroxybenzoic acids and the free acids thereof, which comprises reacting a 2,6-disubstituted phenol in a mixture of water and a dipolar aprotic solvent with an alkalimetal hydroxide, removing the water, treating the reaction mixture with carbon dioxide and in case of preparing the free acids treating the reaction mixture with a mineral acid.The alkalimetal salts of 4-hydroxybenzoic acids and the free acids thereof are compounds which can be used as intermediates for stabilizers.
    Type: Grant
    Filed: February 24, 1975
    Date of Patent: July 5, 1977
    Assignee: Ciba-Geigy Corporation
    Inventors: Hanns Lind, Jean Rody, Heimo Brunnetti