Patents by Inventor Harriet J. S. Kendrick

Harriet J. S. Kendrick 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).

  • Blown asphalt compositions
    Patent number: 7576148
    Abstract: A process for preparing compatible, selectively hydrogenated block copolymer-modified bituminous compositions comprising blowing a mixture of the block copolymer and bitumen with an oxidizing gas at temperatures of at least 375° C. for at least 75 minutes. The modifying polymer is a selectively hydrogenated styrenic block copolymer and no blowing catalyst is required. Stable bituminous compositions comprising 6 to 25 parts by weight of block copolymer per 100 parts of asphalt are also provided as well as their application as roofing shingles.
    Type: Grant
    Filed: November 9, 2005
    Date of Patent: August 18, 2009
    Assignee: Kraton Polymers U.S. LLC
    Inventors: Robert Q. Kluttz, Harriet J. S. Kendrick, Keith E. Stephens