Patents by Inventor Ronghua Liu

Ronghua 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).

  • Silicone Hydrogel Contact Lenses Having Acceptable Levels Of Energy Loss
    Publication number: 20120220690
    Abstract: Silicone hydrogel contact lenses having ophthalmically acceptable levels of energy loss are described. The lenses are derived from a polymerizable composition including a first siloxane monomer represented by formula (1): wherein m of formula (1) represents one integer from 3 to 10, n of formula (1) represents one integer from 1 to 10, R1 of formula (1) is an alkyl group having from 1 to 4 carbon atoms, and each R2 of formula (1) is independently either a hydrogen atom or a methyl group; the lenses also include units derived from a second siloxane monomer which is a dual-end methacrylate end-capped polydimethylsiloxane having a number average molecular weight of at least 7,000 daltons. Batches of silicone hydrogel contact lenses and methods of making silicone hydrogel contact lenses are also described.
    Type: Application
    Filed: February 24, 2012
    Publication date: August 30, 2012
    Applicant: COOPERVISION INTERNATIONAL HOLDING COMPANY, LP
    Inventors: Ronghua Liu, Xinfeng Shi, Yuwen Liu, Charlie Chen, Ye Hong, Charles A. Francis, Li Yao, Arthur Back, Ying Zheng
  • Inherently colored polyurea and polyurethane
    Publication number: 20040231561
    Abstract: This invention relates to copolymer compositions having pigment like properties, comprising a fluorescent or non-fluorescent dye attached to a polyurea or polyurethane chain by a spacer.
    Type: Application
    Filed: June 16, 2004
    Publication date: November 25, 2004
    Inventors: Bansi Lal Kaul, Jean-Christophe Graciet, Nikolay N. Barashkov, Thomas C. Molloy, Ronghua Liu