Patents by Inventor Chunshan Zhang

Chunshan 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).

  • Patent number: 7928268
    Abstract: The present invention relates to a process for producing a 2-fluoro-6-halophenol as an intermediate; a process for producing a 2-alkoxy-3-fluorophenol and further a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; a second process for producing a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; and a 2-alkoxy-3-fluorophenol. The 2-fluoro-6-halophenol can be obtained using a 2-fluorophenol as a starting material and through a sulfonation reaction, a halogenation reaction, and a deprotection reaction. The 2-fluoro-6-halophenol is alkyl-etherified, and subsequently the halogen atom is converted into a hydroxyl group to obtain the 2-alkoxy-3-fluorophenol, which is further alkyl-etherified to thereby obtain the 1,2-dialkoxy-3-fluorobenzene. Alternatively, a 1,2-dialkoxy-3-fluorobenzene is also obtained by converting the halogen atom of the 2-fluoro-6-halophenol into a hydroxyl group to thereby form 3-fluorocatechol and subsequently alkyl-etherifying two hydroxyl groups thereof.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: April 19, 2011
    Assignees: Asahi Glass Company, Limited, Charna Chemicals Ltd.
    Inventors: Mingjian Qiu, Wei Zhang, Zhaohui Chen, Chunshan Zhang, Yali Zhang
  • Publication number: 20100286451
    Abstract: The present invention relates to a process for producing a 2-fluoro-6-halophenol as an intermediate; a process for producing a 2-alkoxy-3-fluorophenol and further a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; a second process for producing a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; and a 2-alkoxy-3-fluorophenol. The 2-fluoro-6-halophenol can be obtained using a 2-fluorophenol as a starting material and through a sulfonation reaction, a halogenation reaction, and a deprotection reaction. The 2-fluoro-6-halophenol is alkyl-etherified, and subsequently the halogen atom is converted into a hydroxyl group to obtain the 2-alkoxy-3-fluorophenol, which is further alkyl-etherified to thereby obtain the 1,2-dialkoxy-3-fluorobenzene. Alternatively, a 1,2-dialkoxy-3-fluorobenzene is also obtained by converting the halogen atom of the 2-fluoro-6-halophenol into a hydroxyl group to thereby form 3-fluorocatechol and subsequently alkyl-etherifying two hydroxyl groups thereof.
    Type: Application
    Filed: July 14, 2010
    Publication date: November 11, 2010
    Inventors: Mingjian Qiu, Wei Zhang, Zhaohui Chen, Chunshan Zhang, Yali Zhang
  • Patent number: 7786330
    Abstract: The present invention relates to a process for producing a 2-fluoro-6-halophenol as an intermediate; a process for producing a 2-alkoxy-3-fluorophenol and further a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; a second process for producing a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; and a 2-alkoxy-3-fluorophenol. The 2-fluoro-6-halophenol can be obtained using a 2-fluorophenol as a starting material and through a sulfonation reaction, a halogenation reaction, and a deprotection reaction. The 2-fluoro-6-halophenol is alkyl-etherified, and subsequently the halogen atom is converted into a hydroxyl group to obtain the 2-alkoxy-3-fluorophenol, which is further alkyl-etherified to thereby obtain the 1,2-dialkoxy-3-fluorobenzene. Alternatively, a 1,2-dialkoxy-3-fluorobenzene is also obtained by converting the halogen atom of the 2-fluoro-6-halophenol into a hydroxyl group to thereby form 3-fluorocatechol and subsequently alkyl-etherifying two hydroxyl groups thereof.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: August 31, 2010
    Assignees: Asahi Glass Company, Limited, Charna Chemicals, Ltd.
    Inventors: Mingjian Qiu, Wei Zhang, Zhaohui Chen, Chunshan Zhang, Yali Zhang
  • Publication number: 20090227817
    Abstract: The present invention relates to a process for producing a 2-fluoro-6-halophenol as an intermediate; a process for producing a 2-alkoxy-3-fluorophenol and further a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; a second process for producing a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; and a 2-alkoxy-3-fluorophenol. The 2-fluoro-6-halophenol can be obtained using a 2-fluorophenol as a starting material and through a sulfonation reaction, a halogenation reaction, and a deprotection reaction. The 2-fluoro-6-halophenol is alkyl-etherified, and subsequently the halogen atom is converted into a hydroxyl group to obtain the 2-alkoxy-3-fluorophenol, which is further alkyl-etherified to thereby obtain the 1,2-dialkoxy-3-fluorobenzene. Alternatively, a 1,2-dialkoxy-3-fluorobenzene is also obtained by converting the halogen atom of the 2-fluoro-6-halophenol into a hydroxyl group to thereby form 3-fluorocatechol and subsequently alkyl-etherifying two hydroxyl groups thereof.
    Type: Application
    Filed: February 24, 2009
    Publication date: September 10, 2009
    Inventors: Mingjian Qiu, Wei Zhang, Zhaohui Chen, Chunshan Zhang, Yali Zhang
  • Publication number: 20070038710
    Abstract: Methods and computer program products for managing redundant email. According to one aspect of the invention, a determination is made as to whether a first email is contained in a second email. If the first email is contained in the second email, the first email is purged. Email attachments may be transferred from the first email to the second email, so that the attachments are not lost when the first email is purged.
    Type: Application
    Filed: August 12, 2005
    Publication date: February 15, 2007
    Inventors: Yongcheng Li, Yuping Wu, Chunshan Zhang
  • Publication number: 20050234700
    Abstract: Under the present invention, a user will provide content to be translated to a translation engine. After making the translation, the user will be provided with the results and transaction process details specifying the context of the translation. Based on the context, the user can provide feedback regarding the quality of the translation. Then, based on the feedback, the translation resource used to make the translation can be updated.
    Type: Application
    Filed: April 15, 2004
    Publication date: October 20, 2005
    Applicant: International Business Machines Corporation
    Inventors: Yongcheng Li, Yuping Wu, ChunShan Zhang