Patents by Inventor Francoise Duboudin

Francoise Duboudin 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).

  • Production of infusible polycarbosilanes convertible into silicon carbide ceramics
    Patent number: 5064915
    Abstract: Infusible and insoluble polycarbosilanes, readily pyrolyzed into silicon carbide ceramic materials, e.g., SiC fibers, are produced by hardening a fusible polycarbosilane containing at least two .tbd.SiH groups per molecule via intimately contacting such fusible polycarbosilane with an effective hardening amount of the vapors of sulfur.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: November 12, 1991
    Assignee: Rhone-Poulenc Chimie
    Inventors: Francoise Duboudin, Odile Babot, Jean-Paul Pillot, Jacques Dunogues, Eric Bouillon, Rene Pailler
  • Conversion of polycarbosilanes into silicon carbonitride ceramics
    Patent number: 5049529
    Abstract: Silicon carbonitride ceramic materials are produced by (a) hardening a fusible polycarbosilane containing at least two .tbd.SiH groups per molecule by intimately contacting such fusible polycarbosilane with an effective hardening amount of the vapors of sulfur, next (b) heat treating the infusible polycarbosilane which results under an ammonia atmosphere to such extent as to introduce nitrogen into the infusible polycarbosilane without completely removing the carbon therefrom, and then (c) heat treating the nitrogenated polycarbosilane in a vacuum or in an inert atmosphere to such extent as to essentially completely convert it into a ceramic silicon carbonitride.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: September 17, 1991
    Assignee: Rhone-Poulenc Chimie
    Inventors: Francoise Duboudin, Jean-Paul Pillot, Jacques Dunogues, Marc Birot, Odile Babot, Rene Pailler
  • Conversion of polycarbosilanes into silicon nitride ceramics
    Patent number: 5028571
    Abstract: Silicon nitride ceramic materials are produced by (a) hardening a fusible polycarbosilane containing at least two .dbd.SiH groups per molecule by intimately contacting such fusible polycarbosilane with an effective hardening amount of the vapors of sulfur, and then (b) pyrolyzing the infusible polycarbosilane which results under an ammonia atmosphere.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: July 2, 1991
    Assignee: Rhone-Poulenc Chimie
    Inventors: Jean-Paul Pillot, Jacques Dunogues, Marc Birot, Raphael Bodet, Francoise Duboudin