Patents by Inventor Pierre Etchart

Pierre Etchart 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).

  • Novel filter aid compositions for improving the limiting filterability temperature and inhibition of n-paraffin crystal formation during low temperature of middle distillates
    Patent number: 4367074
    Abstract: Novel filter aid compositions enabling the improvement of limiting filterability temperature and the simultaneous inhibition of settling of the n-paraffin crystals formed at low temperature, comprising a mixture:of a compound A chosen from among the group of polymers or copolymers having a molecular weight between 500 and 15000 and having a branching rate between 10 and 30 points per 100 carbon atoms;and a compound B resulting from the condensation of at least one cyclic anhydride and at least one linear N-alkyl-polyamine;the weight ratio between these constituents A and B being from 1:20 to 20:1.
    Type: Grant
    Filed: September 16, 1981
    Date of Patent: January 4, 1983
    Assignee: Elf France
    Inventors: Paul Maldonado, Pierre Etchart, Daniele Eber