Patents by Inventor Donald I. Angelbeck

Donald I. Angelbeck 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).

  • Lime-fly ash-aggregate-sludge paving material
    Patent number: 4105463
    Abstract: A composition and method for producing an improved lime-fly ash-aggregate is disclosed. The composition is prepared by mixing together lime, flyash, graded aggregate, adding water, and from 0.5 to 4 percent, based on total dry weight, of sludge from a water treatment plant. The mixture is placed on top of a prepared subgrade, spread uniformly, and compacted to a high degree of relative density to provide the main load-carrying component of a road, airport runway, parking lot or the like.
    Type: Grant
    Filed: December 11, 1975
    Date of Patent: August 8, 1978
    Assignee: The University of Toledo
    Inventor: Donald I. Angelbeck