Patents by Inventor Jean-Claude Doukhan

Jean-Claude Doukhan 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).

  • Process for the preparation of berlinite crystals with high Q factor
    Patent number: 4990217
    Abstract: The invention relates to a process for the preparation of berlinite crystals AlPO.sub.4, with a high Q factor, from seeds or crystalline flakes of AlPO.sub.4, by a hydrothermal method. It is characterized in that the crystallization solution is a sulfuric solution of AlPO.sub.4. The invention also relates to the berlinite monocrystals obtained by this process.
    Type: Grant
    Filed: January 26, 1989
    Date of Patent: February 5, 1991
    Assignees: Centre National de la Recherche Scientifique (CNRS), Etat Francais, represente par le Ministre des PTT (Centre National d'Etudes des Telecommunications)
    Inventors: Etienne Philippot, Jean-Claude Jumas, Bernard Capelle, Yves Toudic, Jacques Detaint, Jacquie Schwartzel, Aline Goiffon, Maurice Maurin, Jean-Claude Doukhan, Albert Zarka