Patents by Inventor Weizhong Liu

Weizhong 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: 8784556
    Abstract: An angle-dependent interference pigment based on transparent or translucent inorganic flake serving as a substrate is provided. The substrate is coated by coatings (A)+(B)+(C) and optionally coating (D), so as to form a “high-low-high” refractive index layered structure. The coatings (A) and (C) consist of metal oxides, silicate, aluminates and/or a mixture thereof. The coating (B) consist of silicon oxide, hydrous silicon oxide, aluminum oxide, hydrous aluminum oxide, magnesium oxide, hydrous magnesium oxide and/or a mixture thereof. The angle-dependent interference pigments have high color saturation in the transitional region and a significantly gradual color change in the color changing region. The present pigments can be used as colored coatings, including printing ink, or can be used in the preparation of plastics, glass, ceramics and the like. The pigment of the present invention is particularly used in the cosmetic industry which has a very high requirement on gradual color change.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: July 22, 2014
    Assignee: Shantou Longhua Pearl Lustre Pigments Co., Ltd.
    Inventors: Weizhong Liu, Yulin Zhuang
  • Publication number: 20110306678
    Abstract: An angle-dependent interference pigment based on transparent or translucent inorganic flake serving as a substrate is provided. The substrate is coated by coatings (A)+(B)+(C) and optionally coating (D), so as to form a “high-low-high” refractive index layered structure. The coatings (A) and (C) consist of metal oxides, silicate, aluminates and/or a mixture thereof. The coating (B) consist of silicon oxide, hydrous silicon oxide, aluminum oxide, hydrous aluminum oxide, magnesium oxide, hydrous magnesium oxide and/or a mixture thereof. The angle-dependent interference pigments have high color saturation in the transitional region and a significantly gradual color change in the color changing region. The present pigments can be used as colored coatings, including printing ink, or can be used in the preparation of plastics, glass, ceramics and the like. The pigment of the present invention is particularly used in the cosmetic industry which has a very high requirement on gradual color change.
    Type: Application
    Filed: February 24, 2010
    Publication date: December 15, 2011
    Inventors: Weizhong Liu, Yulin Zhuang
  • Patent number: 6936571
    Abstract: The present invention provides an agricultural fungicidal composition containing active compounds selected from perylenequinonoid derivatives or salts thereof. The invention also relates the application of the composition against fungal plant infections.
    Type: Grant
    Filed: October 21, 2002
    Date of Patent: August 30, 2005
    Inventors: Hongyu Zhnag, Weizhong Liu
  • Publication number: 20030216478
    Abstract: The present invention provides an agricultural fungicidal composition containing active compounds selected from perylenequinonoid derivatives or salts thereof. The invention also relates the application of the composition against fungal plant infections.
    Type: Application
    Filed: October 21, 2002
    Publication date: November 20, 2003
    Inventors: Hongyu Zhnag, Weizhong Liu