Patents by Inventor Yun L. Zheng

Yun L. Zheng 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).

  • Patent number: 5413067
    Abstract: A method of obtaining a crystal by crystal growth in the liquid phase from a seed in the form of a plate taken from a primary crystal, which method comprises at least two steps constituted firstly by forming first crystal growth to obtain a secondary crystal from a first seed taken from said primary crystal in a first growth zone, and secondly in performing second crystal growth from a second seed taken from said secondary crystal in a second growth zone, said first and second seeds being selected so that few of the dislocations that they contain propagate respectively into the second zone of the secondary crystal or into the first growth zone of the resulting crystal. According to the invention said first and second crystal growth steps are performed in different growth directions. Application to monocrystals of quartz, or of materials that are isomorphs of quartz, such as berlinite, and that are intended for use in making electronic components, in particular oscillators and filters.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: May 9, 1995
    Assignees: France Telecom, Centre National de la Recherche Scientifique (CNRS)
    Inventors: Albert Zarka, Jacques Detaint, Jacquie Schwartzel, Yves Toudic, Bernard Capelle, Yun L. Zheng, Etienne Philippot, Xavier Buisson, Roger Arnaud