Patents by Inventor Darnell DeGraff

Darnell DeGraff 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).

  • Ultraviolet resistant glutarimide
    Patent number: 5585423
    Abstract: Polymers of (N-lower alkyl)dimethylglutarimide or (N-hydrogen)dimethylglutarimide are resistant to surface crazing, molecular weight degradation and yellowing on exposure to ultraviolet light, by inclusion of a hindered amine stabilizer.
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: December 17, 1996
    Assignee: Rohm and Haas Company
    Inventors: Leslie A. Cohen, Darnell DeGraff, Harry C. Fromuth, Theodore D. Goldman