Patents by Inventor Yufeng Liu

Yufeng 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).

  • Patent number: 7998587
    Abstract: A method of modifying light is disclosed and includes: providing an optical element having an oriented polymer network of a silicone (meth)acrylate copolymer and exhibiting a first phase and a second phase, the first phase and the second phase being chemically connected and having different refractive indices, the first phase being continuous, and the second phase comprising a plurality of structures dispersed within the first phase; illuminating the optical element with light from a light source; and detecting polarized or directionally diffused light transmitted by the optical element. Optical elements including the polymer network and a variety of additional layers are also disclosed, as are optical devices such as prisms, display panels, lenses, and the like.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: August 16, 2011
    Assignee: 3M Innovative Properties Company
    Inventors: Mieczyslaw H. Mazurek, Robert L. Brott, David J. Kinning, Yufeng Liu, John E. Potts, Kevin R. Schaffer, Audrey A. Sherman, Wendi J. Winkler
  • Publication number: 20110116012
    Abstract: A passive daylight-coupled display having an LCD panel, a diffuser, a turning film behind the LCD panel, and a curved reflector behind the turning film. For passive backlighting, the diffuser transmits daylight to the reflector, which reflects the daylight to the LCD panel through the turning film and provides for substantially uniform distribution of the daylight on the LCD panel for backlighting it. The turning film has prisms with chaos for an improved viewer experience.
    Type: Application
    Filed: November 18, 2009
    Publication date: May 19, 2011
    Inventors: Rolf W. Biernath, Jennifer R. Yi, Gilles J. Benoit, Yufeng Liu, Michael F. Weber
  • Publication number: 20110109966
    Abstract: Presently described are multilayer optical films comprising an optical stack comprising at least one first birefringent optical layer; at least one (e.g. isotropic) second optical layer having a birefringence of less than 0.04 at 633 nm, and optionally at least one skin layer. The second layer, skin layer, or a combination thereof comprises a blend of at least one methyl methacrylate polymer and at least one styrene-acrylonitrile polymer.
    Type: Application
    Filed: July 1, 2009
    Publication date: May 12, 2011
    Inventors: Ta-Hua Yu, Timothy J. Hebrink, Yufeng Liu, Edward J. Kivel, Daniel M. Czuprynski, James A. Klein
  • Publication number: 20110051040
    Abstract: In one embodiment, the invention provides a polyethylene terephthalate film comprising a biaxially oriented and birefringent film polyethylene terephthalate film having at least one layer having a thickness of from 10 mils (0.25 mm) to 25 mils (0.64 mm), wherein the film is formed from a polyethylene terephthalate resin comprising the reaction product of dimethyl terephthalate, terephthalic acid, or a combination thereof ethylene glycol, a diol or triol monomer other than ethylene glycol and from 0.9 to 3 mol percent of a sulfonate monomer having an inorganic counterion based on 100 mol percent dimethyl terephthalate, terephthalic acid, or a combination thereof.
    Type: Application
    Filed: March 19, 2009
    Publication date: March 3, 2011
    Inventors: Stephen A. Johnson, Yufeng Liu, David T. Yust
  • Publication number: 20100277668
    Abstract: Optical film laminates of birefringent polyester films and adhesive are disclosed. The laminates have a thickness of at least 10 mils (0.25 mm). The laminates of the invention are useful in displays having a diagonal of 37 in (94 cm) or greater.
    Type: Application
    Filed: December 8, 2008
    Publication date: November 4, 2010
    Inventors: Lowell C. Frank, Stephen A. Johnson, Ji-Hyung Kim, Byung-Soo Ko, Ji-Hwa Lee, Yufeng Liu
  • Publication number: 20100201242
    Abstract: Film stacks and displays incorporating the same are described.
    Type: Application
    Filed: January 29, 2010
    Publication date: August 12, 2010
    Inventors: YuFeng Liu, Michael E. Lauters, Ade Babatunde
  • Publication number: 20100171929
    Abstract: A communication article and system comprising a writing member having a dry erasable front surface and a projection member is disclosed. The projection member includes an asymmetric optical diffuser that scatters light in a first direction with a first viewing angle AH, and in a second direction orthogonal to the first direction with a second viewing angle AV. The ratio AH/AV is at least about 2.
    Type: Application
    Filed: January 8, 2010
    Publication date: July 8, 2010
    Inventors: Yufeng LIU, Encai HAO, David T. YUST, Lan H. LIU, Frederick J. GUSTAFSON, Willem V. BASTIAENS, Yu Yang
  • Publication number: 20100124667
    Abstract: Multilayer optical films are described comprising at least one first optical layer comprising a birefringent thermoplastic polymer having an in-plane birefringence of at least 0.15 at 632.8 nm; and at least one second optical layer having an in-plane birefringence of less than 0.040 at 632.8 nm. The second optical layer comprises a copolymerized blend of at least one birefringent thermoplastic polymer and at least one second thermoplastic polymer.
    Type: Application
    Filed: November 18, 2008
    Publication date: May 20, 2010
    Inventors: Yufeng Liu, Stephen A. Johnson
  • Patent number: 7697976
    Abstract: The invention relates to a non-invasive method to diagnose the changes of molecular structures of organism tissues from body surface and a dedicated apparatus. The apparatus is comprised of a Fourier Transform infrared spectrometer and a set of additional accessories. Said additional accessories include a mid-IR fiber optics sampling attachment, a fiber coupling part, and an infrared detector part. The detection method is comprised of placing the ATR probe of the dedicated apparatus on the skin surface of a region to be tested, and scanning more than one time in which the resolution of the apparatus is 1-32 cm?1 and the range of the spectrum is 800-4000 cm?1. It is possible to detect changes in molecular structures of living biological tissues in the early stages of cancer, and testees will not feel uncomfortable during testing. The method is easy to operate, quick, accurate, and it doesn't harm the body.
    Type: Grant
    Filed: January 18, 2005
    Date of Patent: April 13, 2010
    Assignees: Peking University, Beijing Second Optical InstrumentFacotry
    Inventors: Jinguang Wu, Yuanfu Zhang, Yizhuang Xu, Qingbo Li, Shifu Weng, Limin Yang, Li Zhang, Weijin Zhou, Zhanlan Yang, Weihong Li, Huizhong Wu, Rongye Gong, Xuejun Gao, Duanfu Xu, Ying Zhao, Zhi Xu, Nengwei Zhang, Lixin Wang, Kaihua Sun, Xin Peng, Yufeng Liu, Xuejun Sun, Xiaofeng Ling, Su Zhou, Zhi Liu, Guoqiao Lai, Jianxiong Jiang, Qinghua Pan, Qiguang Wu, Guangyan Yu, Bingbing Wang
  • Publication number: 20090262348
    Abstract: A method of modifying light is disclosed and includes: providing an optical element having an oriented polymer network of a silicone (meth)acrylate copolymer and exhibiting a first phase and a second phase, the first phase and the second phase being chemically connected and having different refractive indices, the first phase being continuous, and the second phase comprising a plurality of structures dispersed within the first phase; illuminating the optical element with light from a light source; and detecting polarized or directionally diffused light transmitted by the optical element. Optical elements including the polymer network and a variety of additional layers are also disclosed, as are optical devices such as prisms, display panels, lenses, and the like.
    Type: Application
    Filed: October 31, 2007
    Publication date: October 22, 2009
    Inventors: Mieczyslaw H. Mazurek, Robert L. Brott, David J. Kinning, Yufeng Liu, John E. Potts, Kevin R. Schaffer, Audrey A. Sherman, Wendi J. Winkler
  • Publication number: 20080228083
    Abstract: The invention relates to a non-invasive method to diagnose the changes of molecular structures of organism tissues from body surface and a dedicated apparatus. The apparatus is comprised of a Fourier Transform infrared spectrometer and a set of additional accessories. Said additional accessories include a mid-IR fiber optics sampling attachment, a fiber coupling part, and an infrared detector part. The detection method is comprised of placing the ATR probe of the dedicated apparatus on the skin surface of a region to be tested, and scanning more than one time in which the resolution of the apparatus is 1-32 cm?1 and the range of the spectrum is 800-4000 cm?1. It is possible to detect changes in molecular structures of living biological tissues in the early stages of cancer, and testees will not feel uncomfortable during testing. The method is easy to operate, quick, accurate, and it doesn't harm the body.
    Type: Application
    Filed: January 18, 2005
    Publication date: September 18, 2008
    Inventors: Jinguang Wu, Yuanfu Zhang, Yizhuang Xu, Qingbo Li, Shifu Weng, Limin Yang, Li Zhang, Weijin Zhou, Zhanian Yang, Weihong Li, Huizhong Wu, Rongye Gong, Xuejun Gao, Duanfu Xu, Ying Zhao, Zhi Xu, Nengwei Zhang, Lixin Wang, Kaihua Sun, Xin Peng, Yufeng Liu, Xuejun Sun, Xiaofeng Ling, Su Zhou, Zhi Liu, Guoqiao Lai, Jianxiong Jiang, Qinghua Pan, Qiguang Wu, Guangyan Yu, Bingbing Wang