Patents by Inventor Julienne Liang

Julienne Liang 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: 5496899
    Abstract: The invention relates to a crosslinkable material that is active in non-linear optics, containing a polymer which carries chromophores each included in a polymer unit of formula: ##STR1## in which: T is part of the polymer chain,A is an --NO.sub.2, --CN or --C(CN).dbd.C(CN).sub.2 group,R.sub.1 is a hydrogen atom or a methyl or ethyl group,R.sub.2 is a CH.sub.2, C.sub.2 H.sub.4, C.sub.3 H.sub.6 or C.sub.4 H.sub.8 group, and:either X=Y is an azo group, F being a hydrogen atom and G being a group --C(O)--O--W or a group --C(O)--O--(CH.sub.2).sub.n --O--W, n being an integer between 2 and 6 and W being a hydrogen atom or a dimerizable group,or X=Y is an azomethine group, one of the groups F and G being a group --O--W or --R.sub.3 --O--W, R.sub.3 being a group --O--C(O)--R.sub.4 -- or --O--R.sub.4 --, where R.sub.4 is a C.sub.1 to C.sub.6 alkyl, the other of the groups F and G being a hydrogen atom and W being a hydrogen atom or a dimerizable group.
    Type: Grant
    Filed: September 1, 1994
    Date of Patent: March 5, 1996
    Assignee: France Telecom
    Inventors: Franck Foll, Dominique Bosc, Julienne Liang, Alain Rousseau, Bernard Boutevin
  • Patent number: 5291574
    Abstract: In a method of manufacturing a planar optical waveguide based entirely on polymer materials an active polymer is deposited onto a semiconductor substrate between two layers of buffer polymers chosen so that the difference in refractive index on each side of the active polymer is between 0.005 and 0.5 and preferably between 0.01 and 0.4.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: March 1, 1994
    Assignee: France Telecom
    Inventors: Regine Levenson, Julienne Liang, Alain Carenco, Joseph Zyss