Patents by Inventor Daniel Manaut

Daniel Manaut 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 p-fuchsones and synthesis of p-dihydroxylated aromatic compounds therefrom
    Patent number: 5670465
    Abstract: p-Dihydroxylated aromatic compounds are prepared via the oxidation of p-fuchsones, the latter advantageously being synthesized by reacting a phenolic compound having at least one hydrogen atom in the para-position to the hydroxyl function with a non-enolizable ketonic compound, in the presence of a catalytically effective amount of an acid catalyst and, optionally, a cocatalytically effective amount of an ionizable sulfur-containing compound.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: September 23, 1997
    Assignee: Rhone-Poulenc Chimie
    Inventors: Michel Costantini, Daniel Manaut, Daniel Michelet
  • Preparation of P-fuchsones and synthesis of P-Dihydroxylated aromatic compounds therefrom
    Patent number: 5585526
    Abstract: p-Dihydroxylated aromatic compounds are prepared via the oxidation of p-fuchsones, the latter advantageously being synthesized by reacting a phenolic compound having at least one hydrogen atom in the para-position to the hydroxyl function with a non-enolizable ketonic compound, in the presence of a catalytically effective amount of an acid catalyst and, optionally, a cocatalytically effective amount of an ionizable sulfur-containing compound.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: December 17, 1996
    Assignee: Rhone-Poulenc Chimie
    Inventors: Michel Costantini, Daniel Manaut, Daniel Michelet
  • Preparation of p-fuchsones and synthesis of p-dihydroxylated aromatic compounds therefrom
    Patent number: 5466839
    Abstract: p-Dihydroxylated aromatic compounds are prepared via the oxidation of p-fuchsones, the latter advantageously being synthesized by reacting a phenolic compound having at least one hydrogen atom in the para-position to the hydroxyl function with a non-enolizable ketonic compound, in the presence of a catalytically effective amount of an acid catalyst and, optionally, a cocatalytically effective amount of an ionizable sulfur-containing compound.
    Type: Grant
    Filed: January 10, 1994
    Date of Patent: November 14, 1995
    Assignee: Rhone-Poulenc Chimie
    Inventors: Michel Costantini, Daniel Manaut, Daniel Michelet
  • Preparation of o-dihydroxylated aromatic compounds via oxidation of o-fuchsones
    Patent number: 5414155
    Abstract: o-Dihydroxylated aromatic compounds, for example pyrocatechol, are selectively prepared by reacting an o-fuchsone with an oxidizing agent, for example hydrogen peroxide, optionally in the presence of a catalytically effective amount of an acid catalyst.
    Type: Grant
    Filed: January 10, 1994
    Date of Patent: May 9, 1995
    Assignee: Rhone-Poulenc Chimie
    Inventors: Michel Costantini, Daniel Manaut, Daniel Michelet