Patents by Inventor Charles C. Ketterer

Charles C. Ketterer 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).

  • Polyester antifume additive for spandex fiber
    Patent number: 4504612
    Abstract: Saturated aliphatic polyesters having a repeating unit which has the structural form of a residue of a glycol combined with a residue of a diacid or the form of a residue of a hydroxy acid, the number of carbon atoms in the shortest chain between ends of the residues being in the range of 3 to 10 for the glycol residue and no more than 12 for the diacid residue or for the hydroxy acid residue, provide polyether-based spandex fibers with improved resistance to discoloration induced by exposure to nitrogen dioxide fumes.
    Type: Grant
    Filed: September 26, 1983
    Date of Patent: March 12, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Charles C. Ketterer