Patents by Inventor Helene Lefranc

Helene Lefranc 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 hydroxybenzaldehyes
    Patent number: 5811559
    Abstract: Hydroxybenzaldehydes, for example salicylaldehyde, are prepared in high yields by oxidizing the corresponding hydroxybenzyl alcohols, e.g., saligenol, with molecular oxygen or an oxygen-containing gas, in liquid phase, in an aqueous reaction medium containing an alkali, in the presence of (i) a catalytically effective amount of a platinum catalyst and (ii) a cocatalytically effective amount of boron and bismuth compounds.
    Type: Grant
    Filed: November 18, 1997
    Date of Patent: September 22, 1998
    Assignee: Rhone-Poulenc Chimie
    Inventor: Helene LeFranc
  • Preparation of hydroxybenzaldehydes
    Patent number: 5689009
    Abstract: Hydroxybenzaldehydes, for example salicylaldehyde, are prepared in high yields by oxidizing the corresponding hydroxybenzyl alcohols, e.g., saligenol, with molecular oxygen or an oxygen-containing gas, in liquid phase, in an aqueous reaction medium containing an alkali, in the presence of (i) a catalytically effective amount of a platinum catalyst and (ii) a cocatalytically effective amount of boron and bismuth compounds.
    Type: Grant
    Filed: February 13, 1995
    Date of Patent: November 18, 1997
    Assignee: Rhone-Poulenc Chimie
    Inventor: Helene Lefranc