Patents by Inventor Adrien Dromard

Adrien Dromard 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).

  • Hydroxylation of aromatic compounds
    Patent number: 4208536
    Abstract: Aromatic compounds of the general formula ##STR1## in which R and R.sub.o represents a hydrogen atom or an alkyl radical of 1 to 4 carbon atoms are hydroxylated by reaction with hydrogen peroxide in the presence of a catalytic amount of a strong acid and the reaction is carried out in the presence of an activator which is a juxtanuclear aromatic aldehyde or derivative thereof selected from an acetal or a benzhydrol.
    Type: Grant
    Filed: December 21, 1976
    Date of Patent: June 17, 1980
    Assignee: Rhone-Poulenc Industries
    Inventors: Michel Costantini, Adrien Dromard, Michel Jouffret, Roland Nantermet
  • Process for the preparation of 3,5,5-trimethyl-cyclohex-2-ene-1,4-dione
    Patent number: 4092361
    Abstract: 3,5,5-Trimethyl-cyclohex-2-ene-1,4-dione is prepared by a liquid phase oxidation of .beta.-isophorone using carbon black as catalyst in the presence of a base.
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: May 30, 1978
    Assignee: Rhone-Poulenc Industries
    Inventors: Michel Costantini, Adrien Dromard, Michel Jouffret
  • Process for the oxidation of .beta.-isophorone
    Patent number: 4026947
    Abstract: A process for the oxidation of .beta.-ethylenically unsaturated ketones, especially .beta.-isophorone, is provided whereby the ketone is oxidized with a source of molecular oxygen in an organic liquid solvent in the presence of a base and certain chelate catalysts of cobalt or manganese as defined.
    Type: Grant
    Filed: February 23, 1976
    Date of Patent: May 31, 1977
    Assignee: Rhone-Poulenc Industries
    Inventors: Michel Costantini, Adrien Dromard, Michel Jouffret