Patents by Inventor Christophe Rochin

Christophe Rochin 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).

  • Method for dehydrogenofluorination of an aromatic carbamoyl fluoride
    Patent number: 7291750
    Abstract: A method for dehydrogenofluorination for transforming an aromatic carbamoyl fluoride into a corresponding isocyanate, is provided. The method includes subjecting a carbamoyl fluoride to a temperature not less than 80° C. in a solvent wherein the carbamoyl fluoride is in a dissolved or finely dispersed state in the solvent. The method is applicable to organic synthesis.
    Type: Grant
    Filed: July 4, 2000
    Date of Patent: November 6, 2007
    Assignee: Rhodia Chimie
    Inventors: Gilbert Guidot, Christophe Rochin, Laurent Saint-Jalmes
  • Exchange and to the release of an amine from its carbamoyl fluoride
    Patent number: 6552228
    Abstract: The present invention relates to a process for the treatment of an aryl carbamoyl fluoride comprising in its molecule at least one perhalogenated aliphatic carbon, which carbon carries at least one halogen atom to be exchanged with fluorine. This process comprises the stage of bringing the said carbamoyl fluoride into contact with hydrofluoric acid, the ratio of hydrofluoric [lacuna] to carbamoyl fluoride being maintained during the reaction at a value at least equal to 4, preferably to 5, and characterized in that the said ratio is at most equal to 11. Application to organic synthesis.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: April 22, 2003
    Assignee: Rhodia Chimie
    Inventors: Gilbert Guidot, Christophe Rochin, Laurent Saint-Jalmes
  • Stabilization of perfluoroalkyl alkyl ketones
    Patent number: 6531075
    Abstract: Acids having a pKa of less than about 4 may be used to stabilize certain perfluoroalkyl alkyl ketones, particularly a substantially pure perfluoroalkyl alkyl ketone, a substantially pure aqueous solution of a perfluoroalkyl alkyl ketone or a substantially pure hydrate of a perfluoroalkyl alkyl ketone.
    Type: Grant
    Filed: October 29, 1999
    Date of Patent: March 11, 2003
    Assignee: Rhodia Limited
    Inventors: Christophe Rochin, Christopher Mark Richardson
  • Process for the preparation of halogenated derivatives and Lewis acid base catalysts thereof
    Patent number: 6235949
    Abstract: A process for the preparation of halide compounds, preferably aryl halides, by contacting a gaseous mixture of hydrohalic acid and a compound selected from an aryl halogen formate, an aryl carbonate and equivalents thereof with a Lewis acid catalyst.
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: May 22, 2001
    Assignee: Rhodia Chimie
    Inventors: Herve Garcia, Laurent Gilbert, Serge Ratton, Christophe Rochin
  • Method for synthesizing aryl hydrazine through reduction of a diazo compound derivative
    Patent number: 6087534
    Abstract: The invention involves a procedure for synthesizing aryl hydrazine through reduction of a diazo derivative. The distinguishing feature of the method is that it involves at least the following step: c) bringing a diazo derivative into contact with a sulphite solution in which the pH level is at least 7. Applications: organic synthesis.
    Type: Grant
    Filed: September 21, 1998
    Date of Patent: July 11, 2000
    Assignee: Rhodia Chimie
    Inventors: Jean-Manuel Mas, Christophe Rochin
  • Process for the preparation of aromatic aldehydes
    Patent number: 5068450
    Abstract: A process for the preparation of aromatic aldehydes by formylation of aromatic compounds in liquid hydrofluoric acid in the presence of boron trifluoride.
    Type: Grant
    Filed: February 28, 1990
    Date of Patent: November 26, 1991
    Assignee: Rhone-Poulenc Chimie
    Inventors: Michel Crochemore, Christophe Rochin
  • Preparation of methylenedi (phenylurethane)
    Patent number: 5068391
    Abstract: The bis-(N-carboalkoxyanilino)methanes, optionally in the presence of at least one alkyl N-phenylcarbamate, are selectively rearranged into methylenedi(phenylurethane), MDU, in the presence of an effective amount of hydrofluoric acid.
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: November 26, 1991
    Assignee: Rhone-Poulenc Chimie
    Inventors: Michel Gubelmann, Christophe Rochin, Christian Allandrieu