Patents by Inventor Clarence D. Ferrell

Clarence D. Ferrell 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).

  • Reduction of free monomer in isocyanate adducts
    Patent number: 4888442
    Abstract: The present invention is directed to a process for reducing the free monomer content of polyisocyanate adduct mixtures wherein the adduct has an average isocyanate functionality of greater than about 1.8 which comprises treating the polyisocyanate adduct mixture in the presence of 2 to about 30 percent by weight of an inert solvent, based on the weight of the polyisocyanate mixture, in an agitated thin-layer evaporator under conditions sufficient to reduce the free monomer content of the polyisocyanate adduct mixture below that level which is obtainable in the absence of a solvent.
    Type: Grant
    Filed: September 23, 1986
    Date of Patent: December 19, 1989
    Assignee: Mobay Corporation
    Inventors: Kenneth L. Dunlap, Peter H. Markusch, Clarence D. Ferrell