Patents by Inventor Yufeng R. Liu

Yufeng R. Liu 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).

  • Optical film comprising birefringent naphthalate copolyester having branched or cyclic C4-C10 alkyl units
    Patent number: 8263731
    Abstract: The present invention relates to multilayer optical films and birefringent copolyester films. The birefringent copolyester optical layer or birefringent copolyester film comprises a major amount of naphthalate units, ethylene units, and a minor amount of branched or cyclic C4 to C10 alkyl units. Also described are certain copolyester polymeric materials further comprising subunits of a phthalate ionomer such as dimethyl sulfosodium isophthalate ionomer.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: September 11, 2012
    Assignee: 3M Innovative Properties Company
    Inventors: Yufeng R. Liu, David T. Yust, Stephen A. Johnson, Kristopher J. Derks
  • OPTICAL FILM COMPRISING BIREFRINGENT NAPHTHALATE COPOLYESTER HAVING BRANCHED OR CYCLIC C4-C10 ALKYL UNITS
    Publication number: 20110268939
    Abstract: The present invention relates to multilayer optical films and birefringent copolyester films. The birefringent copolyester optical layer or birefringent copolyester film comprises a major amount of naphthalate units, ethylene units, and a minor amount of branched or cyclic C4 to C10 alkyl units. Also described are certain copolyester polymeric materials further comprising subunits of a phthalate ionomer such as dimethyl sulfosodium isophthtalate ionomer.
    Type: Application
    Filed: July 14, 2011
    Publication date: November 3, 2011
    Inventors: Yufeng R. Liu, David T. Yust, Stephen A. Johnson, Kristopher J. Derks
  • METHOD FOR MANUFACTURING ON A FILM SUBSTRATE AT A TEMPERATURE ABOVE ITS GLASS TRANSITION
    Publication number: 20090155458
    Abstract: A method for preparing a flexible film substrate with a low glass transition temperature can be used in the production of an article that retains dimensions and improves the surface smoothness after high temperature processing. The invention, for example, would enable low temperature films such as PET and PEN to be dimensionally stable and ultra flat at conditions commonly used in electronic processing which can typically exceed 200° C. More specifically, the methods enable the use of e.g. barrier films based on PET or PEN in OLED/PLED manufacturing.
    Type: Application
    Filed: February 7, 2007
    Publication date: June 18, 2009
    Inventors: Mark A. Roehrig, Yufeng R. Liu, Robert W. Peterson