Patents by Inventor Charles Mathieu

Charles Mathieu 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).

  • Method for chemically passivating a surface of a product made of a III-V semiconductor material and the product obtained by such a method
    Patent number: 9514961
    Abstract: A method for chemically passivating a surface of a product made of a III-V semiconductor material in which a) a P(N) polymer film is formed by deposition in a solvent comprising liquid ammonia. The film is formed by deposition, without electrochemical assistance, in the solvent, in the presence of an oxidizing chemical additive comprising phosphorous and generating electrical charge carriers in said surface.
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: December 6, 2016
    Assignees: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE—CNRS, ECOLE POLYTECHNIQUE, UNIVERSITE VERSAILLES SAINT-QUENTIN-EN-YVELINES
    Inventors: Arnaud Etcheberry, Anne-Marie Goncalves, Charles Mathieu, Jacky Vigneron, Nicolas Mézailles, Francoise Hervagault, Elaine Le Floch, Clémence Le Floch, Paul Le Floch
  • Vibration damper
    Patent number: 4167646
    Abstract: New and improved vibration damper, primarily for power cables, is disclosed and comprises two damper elements having interfaces of vibrational energy absorbing materials in the nature of rubber, and two rigid absorber arm and weight assemblies pivotally connected thereto. In use, vibrational energy is transmitted from the cable by, and under the vibrational energy absorbing restraint of, the interfaces to the absorber arm and weight assemblies for damping of the same. The absorber arms are of unequal length to provide two natural frequencies for the damper, and the vibration weights are readily removable for replacement by weights of different mass to adapt the same basic vibration damper to a wide variety of applications.
    Type: Grant
    Filed: January 23, 1978
    Date of Patent: September 11, 1979
    Assignees: Willy Frankel, Claudia Frankel
    Inventor: Charles Mathieu