Patents by Inventor Roger D. Spence

Roger D. Spence 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).

  • Low-temperature ashing of hazardous plastic waste
    Patent number: 5239936
    Abstract: System and method for low temperature treatment of organic wastes containing potentially toxic concentrations of metals is described which comprises forming the waste material into pellets of preselected size, mixing the pellets with inert material, incrementally heating the mixture in air from about 200.degree. C. to about 600.degree. C. in order to oxidize the pellets to the corresponding ash containing the metals, collecting the ash, and combining the ash with inert material and binder to form a solidified compact for disposal.
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: August 31, 1993
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Robert P. Wichner, Roger D. Spence, Ivan L. Morgan, Helen W. Jermyn
  • Low-temperature ashing of hazardous plastic waste
    Patent number: 5167711
    Abstract: System and method for low temperature treatment of organic wastes containing potentially toxic concentrations of metals is described which comprises forming the waste material into pellets of preselected size, mixing the pellets with inert material, incrementally heating the mixture in air from about 200.degree. C. to about 600.degree. C. in order to oxidize the pellets to the corresponding ash containing the metals, collecting the ash, and combining the ash with inert material and binder to form a solidified compact for disposal.
    Type: Grant
    Filed: January 3, 1992
    Date of Patent: December 1, 1992
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Robert P. Wichner, Roger D. Spence, Ivan L. Morgan, Helen W. Jermyn
  • Process for impregnating a concrete or cement body with a polymeric material
    Patent number: 4828761
    Abstract: A process for impregnating cementitious solids with polymeric materials by blending polymeric materials in a grout, allowing the grout to cure, and contacting the resulting solidified grout containing the polymeric materials with an organic mixture containing a monomer, a cross-linking agent and a catalyst. The mixture dissolves the polymerized particles and forms a channel for distributing the monomer throughout the network formed by the polymeric particles. The organic components are then cured to form a substantially water-impermeable mass.
    Type: Grant
    Filed: May 4, 1988
    Date of Patent: May 9, 1989
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Alfred J. Mattus, Roger D. Spence