Patents by Inventor Yunming Zhang

Yunming Zhang 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).

  • Embedding and detecting hidden information
    Patent number: 8538068
    Abstract: A novel method is disclosed for detecting hidden information in a document comprising characters, including: determining layout transformation for each character in the document for detection compared with the original document; obtaining a code sequence embedded in the document for detection based on the layout transformation of each character in the document for detection and the predetermined embedding rule; decoding the code sequence to get the hidden information embedded in the document for detection.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: September 17, 2013
    Assignee: Sursen Corp.
    Inventors: Donglin Wang, Shutian Yin, Yunming Zhang, Ningsheng Liu, Yuansong Liang, Changwei Liu, Peng Gao, Yongzhi Lou, De Ouyang
  • Embedding and detecting hidden information
    Patent number: 8311265
    Abstract: A novel method is disclosed for embedding hidden information in a document comprising characters, including: determining hidden information to be embedded in each class of layout transformation respectively; acquiring a code sequence for each class of layout transformation by coding the hidden information to be embedded in the class of layout transformation; performing layout transformation on characters from the document according to the acquired code sequence for each class of layout transformation respectively.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: November 13, 2012
    Assignee: Beijing Sursen International Information Tech Co.
    Inventors: Donglin Wang, Shutian Yin, Yunming Zhang, Ningsheng Liu, Yuansong Liang, Changwei Liu, De Ouyang, Peng Gao, Yongzhi Lou
  • EMBEDDING AND DETECTING HIDDEN INFORMATION
    Publication number: 20080310672
    Abstract: A novel method is disclosed for embedding hidden information in a document comprising characters, including: determining hidden information to be embedded in each class of layout transformation respectively; acquiring a code sequence for each class of layout transformation by coding the hidden information to be embedded in the class of layout transformation; performing layout transformation on characters from the document according to the acquired code sequence for each class of layout transformation respectively.
    Type: Application
    Filed: March 17, 2008
    Publication date: December 18, 2008
    Inventors: Donglin Wang, Shutian Yin, Yunming Zhang, Ningsheng Liu, Yuansong Liang, Changwei Liu, De Ouyang, Peng Gao, Yongzhi Lou
  • Process for separating aromatics by extractive distillation and a composite solvent used therein
    Patent number: 7078580
    Abstract: This application relates to a composite solvent for separating aromatics by extractive distillation, comprising a main solvent, a solutizer and a modifier. Said solutizer is selected from any one or mixtures of any two of C8–C11 aromatics having different number of carbon atoms, the content of which is 3–39 wt %, and the number of carbon atoms of the lowest aromatic in the solutizer should be greater than that of the highest aromatic in the aromatics to be separated. When the solutizer is selected from any one of C8–C11 aromatics, the composite solvent contains 0.01–10.0 wt % of the modifier; when the solutizer is selected from mixtures of any two of C8–C11 aromatics having different number of carbon atoms, the composite solvent contains 0–10.0 wt % of the modifier. Said main solvent and modifier are independently selected from sulfolane derivatives, N-formyl morpholine, and N-methyl pyrrolidone, provided that the acidity and basicity of the modifier are opposite to those of the main solvent.
    Type: Grant
    Filed: June 28, 2002
    Date of Patent: July 18, 2006
    Assignees: China Petroleum & Chemical Corporation, Research Institute of Petroleum Processing, Sinopec
    Inventors: Longsheng Tian, Wencheng Tang, Ming Zhao, Yunming Zhang, Zhifeng Bian, Huixia Sun, Shijin Wu
  • Process for separating aromatics by extractive distillation and a composite solvent used therein
    Publication number: 20030080028
    Abstract: This application relates to a composite solvent for separating aromatics by extractive distillation, comprising a main solvent, a solutizer and a modifier. Said solutizer is selected from any one or mixtures of any two of C8-C11 aromatics having different number of carbon atoms, the content of which is 3-39 wt %, and the number of carbon atoms of the lowest aromatic in the solutizer should be greater than that of the highest aromatic in the aromatics to be separated. When the solutizer is selected from any one of C8-C11 aromatics, the composite solvent contains 0.01-10.0 wt % of the modifier; when the solutizer is selected from mixtures of any two of C8-C11 aromatics having different number of carbon atoms, the composite solvent contains 0-10.0 wt % of the modifier. Said main solvent and modifier are independently selected from sulfolane derivatives, N-formyl morpholine, and N-methyl pyrrolidone, provided that the acidity and basicity of the modifier are opposite to those of the main solvent.
    Type: Application
    Filed: June 28, 2002
    Publication date: May 1, 2003
    Inventors: Longsheng Tian, Wencheng Tang, Ming Zhao, Yunming Zhang, Zhifeng Bian, Huixia Sun, Shijin Wu