Patents by Inventor James W. Abson

James W. Abson 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).

  • Method of removing metallic impurities from sewage sludge
    Patent number: 4244818
    Abstract: A method of removing metallic impurities from sewage sludge wherein the sludge is first acidified in the presence of an oxidizing agent and held to take metallic impurities into solution. The sludge is then treated with a flocculating agent and thickened by removing liquid prior to dilution with an aqueous liquid free from metallic impurities and wherein the sludge is finally dewatered by a mechanical method.
    Type: Grant
    Filed: March 27, 1979
    Date of Patent: January 13, 1981
    Assignee: Simon-Carves Limited
    Inventor: James W. Abson