Patents by Inventor Clifford William Ryan

Clifford William Ryan 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).

  • Patent number: 7534068
    Abstract: Method of recycling a crushed asphalt concrete comprising a friable mixture of asphalt and aggregate particles produced by breaking down a recycled asphalt/aggregate concrete by milling or crushing or the like. The aggregate particles include a substantial portion of the surfaces thereof which are substantially free of adhered asphalt material. The crushed asphalt concrete is mixed with a minor amount of hydraulic cement and water to produce a plastic mixture of the crushed asphalt concrete and hydraulic cement. The plastic mixture is transported to a utilization site such as a building site, road or parking lot and spread on a substrate surface to provide a layer of asphalt concrete pavement. The layer of asphalt concrete pavement has a 7-day compressive strength, typically no more than 1,000 psi, e.g., 150-800 psi. The cement is present in an amount within the range of 1-14 wt. %, more specifically, within the range of 2-10 wt. % of the crushed asphalt concrete and any added aggregate.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: May 19, 2009
    Assignee: Texas Industries, Inc.
    Inventors: Fred John Brouillette, Max Dan Richwine, Clifford William Ryan