Patents by Inventor Marie-Therese Riou

Marie-Therese Riou 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).

  • Organic semiconductor device based on phthalocyanine
    Patent number: 4987430
    Abstract: The present invention relates to an organic semiconductor device based on phthalocyanine. According to the invention, the device comprises a substrate constituted by a layer (10) of a conductive material covered by a layer (20) of a dielectric material, and a coating deposited on the layer of dielectric material and comprising an extrinsic molecular semiconductor (30) constituted by a monophthalocyanine of a divalent metal or by a hydrogenated monophthalocyanine, and an intrinsic molecular semiconductor (40) constituted by a phthalocyanine giving rise to free radicals.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: January 22, 1991
    Inventors: Christian Clarisse, Michel Le Contellec, Marie-Therese Riou
  • Process for the preparation of metal diphthalocyanines
    Patent number: 4649195
    Abstract: The present invention relates to a process for the preparation of lanthanide or yttrium diphthalocyanine, in which:(a) a mixture of lanthanide or yttrium derivative and phthalonitrile is heated, the reaction temperature being kept below the critical temperature of endothermicity, then(b) when an exothermicity appears the temperature is kept at a temperature below the decomposition temperature of the reactants,(c) the lanthanide or yttrium diphthalocyanine obtained is recovered.The products obtained may be used as electroactive agents.
    Type: Grant
    Filed: January 23, 1985
    Date of Patent: March 10, 1987
    Inventors: Christian Clarisse, Marie-Therese Riou nee Meston, Marcel Auregan
  • Electrolytic process for generating erasable pictures on a solid substrate
    Patent number: 4261799
    Abstract: An electrolytic process generates erasable pictures on a solid electrolyte substrate to electrically record data without consumption of energy. The substrate is electrically erasable at will, and then is capable to record data again, and usable as well in telecopy receiver apparatus as display screen. The recording may be made by using an unwearable electrode made of a metal and using a low voltage power supply, for instance under 10V, and a small current. The substrate is substantially unsensitive to ambient light. An electrolytic process locally generates an optical absorption at the surface of an electric conductive layer connected to an anode. The layer has an optically diffusing powder and a metal compound, the amount of which is relatively small. The optical absorption is produced at the contact point between a supplied cathode and the surface by means of a reduction of the metal compound.
    Type: Grant
    Filed: August 23, 1979
    Date of Patent: April 14, 1981
    Inventors: Paul Anizan, Yvon Bessonnat, Marie-Therese Riou