Patents by Inventor Weshi Wu

Weshi Wu 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).

  • Preparation of 4,6-diaminoresorcinol through a bisazoarylresorcinol intermediate
    Patent number: 5453542
    Abstract: The present invention is a method of preparing a 4,6-bisarylazoresorcinol comprising reacting an aryldiazonium salt and resorcinol in the presence of a base and a reaction medium containing water and a water-miscible solvent at a temperature in the range of about -5.degree. C to about -60.degree. C. The present invention is also a method of preparing a 2-substituted 4,6-bisarylazoresorcinol comprising reacting an aryldiazonium salt with a 2-substituted resorcinol. The 4,6-bisarylazoresorcinol or 2-substituted 4,6-bisarylazoresorcinol can then be hydrogenated to a 4,6-diaminoresorcinol, which is a precursor to polybisbenzoxazoles (PBOs), polymers which are useful as insulators, solar arrays, and tear-resistant gloves.
    Type: Grant
    Filed: February 24, 1994
    Date of Patent: September 26, 1995
    Assignee: The Dow Chemical Company
    Inventors: Ted A. Morgan, Bassam S. Nader, Paul Vosejpka, Weshi Wu, Andrew S. Kende