Patents by Inventor Chao-chou Tu

Chao-chou Tu 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).

  • METHOD AND DEVICE FOR PURIFYING 1,4-BIS (BROMODIFLUOROMETHYL) BENZENE
    Publication number: 20090065345
    Abstract: A method and a device for purifying 1,4-bis (bromodifluoromethyl) benzene are disclosed. In order to solve the problem of hard to purify and separate 1,4-bis (bromodifluoromethyl) benzene crude products, diphenylmethane that has a higher boiling point and does not interact with 1,4-bis (bromodifluoromethyl) benzene is mixed with the 1,4-bis (bromodifluoromethyl) benzene crude products for evaporation. Afterwards, the purity of the vaporized product is detected and only that reaching an expected purity is collected to obtain high-purity 1,4-bis (bromodifluoromethyl) benzene.
    Type: Application
    Filed: November 14, 2008
    Publication date: March 12, 2009
    Applicant: CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Shean-Jeng JONG, Chun-Hsu LIN, Chao-Chou TU, Chung-Chien CHANG
  • Method and device for purifying 1,4-bis (bromodifluoromethyl) benzene
    Patent number: 7465841
    Abstract: A method and a device for purifying 1,4-bis(bromodifluoromethyl)benzene are disclosed. In order to solve the problem of hard to purify and separate 1,4-bis(bromodifluoromethyl)benzene crude products, diphenylmethane that has a higher boiling point and does not interact with 1,4-bis(bromodifluoromethyl)benzene is mixed with the 1,4-bis(bromodifluoromethyl)benzene crude products for evaporation. Afterwards, the purity of the vaporized product is detected and only that reaching an expected purity is collected to obtain high-purity 1,4-bis(bromodifluoromethyl)benzene.
    Type: Grant
    Filed: July 27, 2004
    Date of Patent: December 16, 2008
    Assignee: Chung Shan Institute of Science and Technology
    Inventors: Shean-Jeng Jong, Chun-Hsu Lin, Chao-Chou Tu, Chung-Chien Chang
  • Method for the preparation of ?,?,??,??-tetrachloro-p-xylene with high purity
    Patent number: 7060862
    Abstract: A method of synthesizing a high purity product of ?,?,??,??-tetrachloro-p-xylene is disclosed. The method includes carrying out a first stage reaction of terephthaldicarboxaldehyde with a mixture of SOCl2 and dimethylformamide (DMF) to obtain a product mixture containing ?,?,??,??-tetrachloro-p-xylene as a major product and 4-dichloromethyl benzaldehyde as a side product; adding SOCl2 and DMF to the product mixture of the first stage reaction to undergo a second stage reaction; and to a cool water adding the resulting product mixture from the second stage reaction to obtain a solid product of ?,?,??,??-tetrachloro-p-xylene with a purity of 90-99 mol %.
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: June 13, 2006
    Assignee: Chung-Shan Institute of Science & Technology
    Inventors: Shean-Jeng Jong, Chun-Hsu Lin, Chao-chou Tu, Chung-Chien Chang
  • Method and device for purifying 1,4-bis (bromodifluoromethyl) benzene
    Publication number: 20050256349
    Abstract: A method and a device for purifying 1,4-bis(bromodifluoromethyl)benzene are disclosed. In order to solve the problem of hard to purify and separate 1,4-bis(bromodifluoromethyl)benzene crude products, diphenylmethane that has a higher boiling point and does not interact with 1,4-bis(bromodifluoromethyl)benzene is mixed with the 1,4-bis(bromodifluoromethyl)benzene crude products for evaporation. Afterwards, the purity of the vaporized product is detected and only that reaching an expected purity is collected to obtain high-purity 1,4-bis(bromodifluoromethyl)benzene.
    Type: Application
    Filed: July 27, 2004
    Publication date: November 17, 2005
    Inventors: Shean-Jeng Jong, Chun-Hsu Lin, Chao-Chou Tu, Chung-Chien Chang
  • Method for the preparation of alpha, alpha, alpha', alpha' -tetrachloro-p-xylene with high purity
    Publication number: 20050143608
    Abstract: A method of synthesizing a high purity product of ?, ?, ??, ??-tetrachloro-p-xylene is disclosed. The method includes carrying out a first stage reaction of terephthaldicarboxaldehyde with a mixture of SOCl2 and dimethylformamide (DMF) to obtain a product mixture containing ?, ?, ??, ??-tetrachloro-p-xylene as a major product and 4-dichloromethyl benzaldehyde as a side product; adding SOCl2 and DMF to the product mixture of the first stage reaction to undergo a second stage reaction; and to a cool water adding the resulting product mixture from the second stage reaction to obtain a solid product of ?, ?, ??, ??-tetrachloro-p-xylene with a purity of 90-99 mol %.
    Type: Application
    Filed: December 30, 2003
    Publication date: June 30, 2005
    Applicant: Chung-Shan Institute of Science & Technology
    Inventors: Shean-Jeng Jong, Chun-Hsu Lin, Chao-chou Tu, Chung-Chien Chang