Patents by Inventor James T. Hallman

James T. Hallman 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).

  • Process for solidification and immobilization of harmful waste species
    Patent number: 5640704
    Abstract: The present invention provides methods and processes for immobilizing and solidifying harmful heavy metal and radioactive species within a waste material. The processes of the present invention are also particularly advantageous for immobilizing and solidifying nitrate compounds with a waste material. One embodiment of the present invention is a method that can be carried out by admixing the waste material with cement and a complexant compound to form a grout admixture. Preferably, the complexant compound is an iron compound that can form a hydrated iron oxide in the presence of an aqueous solution. This grout admixture is then allowed to cure and solidify. The grout admixture is placed within a suitable containment vessel for final storage and disposal.
    Type: Grant
    Filed: July 24, 1995
    Date of Patent: June 17, 1997
    Inventors: Thomas S. Snyder, David C. Grant, James T. Hallman, Martin Brownstein, Dwight Goad, Carol Kelly, Lori West