Patents by Inventor Gilles Ravaux

Gilles Ravaux 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).

  • Mesomorphic polymer material usable in non linear optics
    Patent number: 4894263
    Abstract: The invention relates to polymeric materials usable in non linear optics. The structure of the material of the invention includes a skeleton to which side chains are attached, the material resulting from the association of a first and a second monomer, the first monomer including a mesomorphogenic group connected to the skeleton by a spacer, the second monomer including a group capable of generating the second harmonic of an electromagnetic wave and also being connected to the skeleton by a spacer.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: January 16, 1990
    Assignee: Thomson-CSF
    Inventors: Jean C. Dubois, Gilles Ravaux, Pierre Le Barny
  • Organic compound having a smectic phase A, and a mixture comprising this compound
    Patent number: 4770810
    Abstract: The invention relates to a family of organic compounds of the 1(4 hydroxyphenyl)2(4' cyanophenyl) ethane ester type which have a smectic A type mesomorphic phase, to the mixture obtained from these compounds as well as the method for manufacturing the molecules of this family. The compound of the invention corresponds to the general chemical formula: ##STR1## n being between 1 and 15.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: September 13, 1988
    Assignee: Thomson-CSF
    Inventors: Jean C. Dubois, Gilles Ravaux, Pierre Le Barny
  • Mesomorphic side-chain polymers having high dielectric anisotropy and a method for producing said polymers
    Patent number: 4717757
    Abstract: The invention relates to a family of sidechain homopolymers of the polyacrylate type derived from 3-fluoro-4-cyanophenol and exhibiting a mesophase of the nematic or smectic-A type. The polymer in accordance with the invention corresponds to the following general chemical formula : ##STR1## where x indicates the degree of polymerization and 4.ltoreq.n.ltoreq.15.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: January 5, 1988
    Assignee: Thomson-CSF
    Inventors: Jean C. Dubois, Gilles Ravaux, Pierre Le Barny
  • Organic compound having a smectic A phase, mixture containing said compound and process for producing the same
    Patent number: 4614608
    Abstract: The invention relates to a group of organic compounds of the 1-(4-hydroxyphenyl)-2-(4'-trifluoromethylphenyl)-ethane ester type having a mesomorphous phase of the smectic A type, to the mixtures obtained from said compounds, as well as to the process for producing the molecules of said group. The compound according to the invention is in accordance with the general chemical formula: ##STR1## whereby n can be between 1 and 15.
    Type: Grant
    Filed: March 13, 1985
    Date of Patent: September 30, 1986
    Assignee: Thomson-CSF
    Inventors: Pierre Le Barny, Jean C. Dubois, Gilles Ravaux
  • Liquid crystals having a type A smectic phase
    Patent number: 4545921
    Abstract: The invention relates to a group of organic compounds of the substituted 2-hydroxyfluorene ester type, which has a smectic A mesomorphous phase. The invention also relates to the process for producing molecules of this group.The compound according to the invention is in accordance with the general chemical formula ##STR1## whereby n can be between 1 and 15 and X=Br or CN. The invention applies to the field of liquid crystals and to display means using such crystals.
    Type: Grant
    Filed: December 29, 1983
    Date of Patent: October 8, 1985
    Assignee: Thomson-CSF
    Inventors: Jean-Claude Dubois, Gilles Ravaux, Pierre Le Barny