Patents by Inventor Benoît Dubuis

Benoît Dubuis 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).

  • Transesterification catalysts fixed on solid support materials
    Publication number: 20020022731
    Abstract: A description is given of a process for the transesterification of carboxylic esters, characterized in that the catalyst used is a tin(IV) compound comprising a radical of the formula 1
    Type: Application
    Filed: March 29, 2001
    Publication date: February 21, 2002
    Inventors: Benoit Pugin, Benoit Dubuis, Adrian Muller
  • Transesterification catalysts fixed to solid support materials
    Patent number: 6248899
    Abstract: A description is given of a process for the transesterification of carboxylic esters, characterized in that the catalyst used is a tin(IV) compound comprising a radical of the formula bound to an inorganic support, where L is an at least divalent radical and at least one of the free valences of the Si in formula (I) is bound to the inorganic support, novel tin(IV) compounds and their preparation.
    Type: Grant
    Filed: August 9, 1999
    Date of Patent: June 19, 2001
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Benoît Pugin, Benoît Dubuis, Adrian Müller
  • Process for the preparation of substituted hydroxyhydrocinnamate esters
    Patent number: 5892097
    Abstract: The transesterification of substituted lower alkyl hydroxyhydrocinnamates with a higher alcohol or a polyol is greatly facilitated by the use of a trace amount of a tin catalyst. In many cases, the amount of the catalyst is so small that it is unnecessary to remove it from the final product by distillation of said product.
    Type: Grant
    Filed: May 22, 1997
    Date of Patent: April 6, 1999
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: John R. Ross, Michael E. Schultz, Benoit Dubuis, Peter Kung