Patents by Inventor Darnel Degraff

Darnel 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: 5324456
    Abstract: Polymers of (N-lower alkyl)dimethylglytarimide or (N-hydrogen)-dimethylglutarimide are resistant to molecular weight degradation and yellowing on exposure to heat and ultraviolet or visible light by inclusion of a hindered piperazinone stabilizer.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: June 28, 1994
    Assignee: Rohm and Haas Company
    Inventor: Darnel Degraff
  • Polymers stabilized against light and heat degradation
    Patent number: 5066696
    Abstract: Tertiary-alkyl-substituted melamines stabilize certain polymers against the deleterious effects of light and heat.
    Type: Grant
    Filed: February 12, 1990
    Date of Patent: November 19, 1991
    Assignee: Rohm and Haas Company
    Inventors: Newman M. Bortnick, Robert A. Wanat, Darnel Degraff