Patents by Inventor Xiangfu Lan

Xiangfu Lan 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).

  • Sulfur dyes
    Patent number: 5961670
    Abstract: New sulfur dyes comprising in their preparation at least one sulfur dye intermediate of the formula I ##STR1## wherein R and R.sub.1 are independently nitro, nitroso or amino, are produced by including in their preparation at least one modifying agent selected from the group of: A) an aldehyde; B) urea; C) a benzoquinone or naphthoquinone; and D) monoethanolamine or by treating an already prepared sulfur dye involving such an intermediate in its preparation, with at least one aldehyde, benzoquinone or naphthoquinone or with monoethanolamine.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: October 5, 1999
    Assignee: Clariant Finance (BVI) Limited
    Inventors: Philip N. Cote, Xiangfu Lan, Alex I. Shakhnovich, Manuel Jose Domingo