Patents by Inventor Pascal Bugnon

Pascal Bugnon 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).

  • Chemical process
    Patent number: 7491834
    Abstract: 3-Isochromanone is prepared by partially chlorinating o-tolylacetic acid with sulphuryl chloride or chlorine gas in an inert organic solvent in the presence of a free radical initiator. The 2-chloromethylphenylacetic acid first obtained is converted to 3-isochromanone by treatment with a base and separated from unreacted o-tolylacetic acid, which is in the form of a salt, by a phase separation technique. The separated o-tolylacetic acid salt is converted to o-tolylacetic acid by controlled acidification and the o-tolylacetic acid is extracted for re-use. The invention reduces the formation of unwanted, over-chlorinated by-products and leads to a more efficient process.
    Type: Grant
    Filed: April 8, 2003
    Date of Patent: February 17, 2009
    Assignees: Syngenta Crop Protection, Inc., Syngenta Limited
    Inventors: Raymond Vincent Heavon Jones, Alan John Whitton, Colin John Bennie, David John Ritchie, Pascal Bugnon
  • Chemical process
    Publication number: 20060163159
    Abstract: 3-Isochromanone is prepared by partially chlorinating o-tolylacetic acid with sulphuryl chloride or chlorine gas in an inert organic solvent in the presence of a free radical initiator. The 2-chloromethylphenylacetic acid first obtained is converted to 3-isochromanone by treatment with a base and separated from unreacted o-tolylacetic acid, which is in the form of a salt, by a phase separation technique. The separated o-tolylacetic acid salt is converted to o-tolylacetic acid by controlled acidification and the o-tolylacetic acid is extracted for re-use. The invention reduces the formation of unwanted, over-chlorinated by-products and leads to a more efficient process.
    Type: Application
    Filed: April 8, 2003
    Publication date: July 27, 2006
    Inventors: Raymond Jones, Alan Whitton, Colin Bennie, David Ritchie, Pascal Bugnon