Patents by Inventor David Causyn

David Causyn 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).

  • Recycled rubber in a polymer modified asphalt and a method of making same
    Patent number: 5436285
    Abstract: An improved paving composition includes between 89-93% graded aggregate, 5.76% asphalt cement, 0.24% SBR polymer and 1-5% graded recycled crumb rubber. The asphalt cement and SBR polymer are blended and heated to form a first mixture. The aggregates are blended and heated to form a second mixture. The two mixtures are blended together prior to the addition of the graded recycled crumb rubber.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: July 25, 1995
    Inventors: David Causyn, Krystina Thys