Patents by Inventor C. Tang

C. Tang 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).

  • Step-by-step alkylation of polymeric amines
    Patent number: 7132496
    Abstract: The invention relates to the following: a method for step-by-step alkylation of primary polymeric amines by step-by-step deprotonation with a metallo-organic base and a subsequent reaction with an alkyl halide; a method for modifying tertiary polymeric amines with other functional groups; polymers with secondary/tertiary amino groups and with quaternary ammonium groups; polymers with secondary/tertiary amino groups and other functional groups, especially cation exchanger groupings; membranes consisting of the above polymers, either non-crosslinked or ionically or covalently cross-linked; acid-base-blends/membranes, and a method for producing same, consisting of basic polymers with polymers containing sulphonic acid, phosphonic acid or carboxyl groups; the use of ion exchanger polymers as membranes in membrane processes, e.g.
    Type: Grant
    Filed: October 30, 2001
    Date of Patent: November 7, 2006
    Inventors: Jochen Kerres, W. Zhang, C. Tang
  • Step-by-step alkylation of polymeric amines
    Publication number: 20020103306
    Abstract: The invention relates to the following: a method for step-by-step alkylation of primary polymeric amines by step-by-step deprotonation with a metallo-organic base and a subsequent reaction with an alkyl halide; a method for modifying tertiary polymeric amines with other functional groups; polymers with secondary/tertiary amino groups and with quaternary ammonium groups; polymers with secondary/tertiary amino groups and other functional groups, especially cation exchanger groupings; membranes consisting of the above polymers, either non-crosslinked or ionically or covalently cross-linked; acid-base-blends/membranes, and a method for producing same, consisting of basic polymers with polymers containing sulphonic acid, phosphonic acid or carboxyl groups; the use of ion exchanger polymers as membranes in membrane processes, e.g.
    Type: Application
    Filed: October 30, 2001
    Publication date: August 1, 2002
    Inventors: Jochen Kerres, W. Zhang, C. Tang