Patents by Inventor Robin E. Graves

Robin E. Graves 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).

  • Hydrated lime added directly to asphalt cement as a multi-functional modifier for asphalt mixtures
    Patent number: 6027558
    Abstract: A hot mix asphalt composition and method are shown in which hydrated lime is added directly to the asphalt binder prior to the addition of the asphalt binder to the mineral aggregate constituent of the composition. The lime-asphalt mixture is then added to the mineral aggregate. The lime component is added to the asphalt binder in an amount which exceeds about 10% by weight, based upon the total weight of asphalt binder in the composition.
    Type: Grant
    Filed: July 6, 1998
    Date of Patent: February 22, 2000
    Assignee: Chemical Lime Company
    Inventors: Dallas N. Little, Robin E. Graves, Fred R. Huege
  • Hot mix asphalt and method of preparation thereof
    Patent number: 5512093
    Abstract: A method is shown for improving the properties of hot mix asphalt by treating the aggregate which is combined with bituminous binder with lime. A hot quicklime slurry is produced by slaking quicklime with water at the site of the hot mix asphalt plant using a portable mixing tank. The hot quicklime slurry is then applied to the aggregate, the aggregate is dried and combined with the binder to produce the hot mix asphalt.
    Type: Grant
    Filed: October 26, 1994
    Date of Patent: April 30, 1996
    Assignee: Chemical Lime Company
    Inventors: Fred R. Huege, Robin E. Graves, Timothy L. Salter, Patrick Shields, Norman L. Hains