Patents by Inventor Valli Velaga

Valli Velaga 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).

  • Process for preparing isocyanates from urethanes by a novel technique
    Patent number: 5457229
    Abstract: Urethanes are converted to isocyanates by reaction with a chloro-, bromo- or iodo-borane compound and a tertiary amine in a nonpolar solvent. With the preferred borane compound, chlorocatecholborane, the reaction goes speedily and under gentle conditions to give the isocyanate in good yield. Also formed is a borate which can be readily converted to the borane compound, for reuse.
    Type: Grant
    Filed: February 9, 1994
    Date of Patent: October 10, 1995
    Assignee: University of Ottawa
    Inventors: Howard Alper, Valli Velaga