Patents by Inventor Karl R. Engels

Karl R. Engels 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).

  • Removal of cadmium from phosphoric acid-containing solutions
    Patent number: 4975162
    Abstract: Process for the removal of cadmium from an aqueous, acidic, cadmium containing solution by electrodepositing the cadmium on conducting particulates present in a packed or fluidized bed cathode compartment of an electrolysis cell in which the aqueous, acidic, cadmium-containing solution contains phosphoric acid. The process is of particular interest for the removal of cadmium from phosphoric acid solutions which are obtained during the production of phosphorus-containing fertilizers from phosphorus rock.
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: December 4, 1990
    Assignee: Shell Research Limited
    Inventors: Karl R. Engels, Arjen Nieuwhof, Johannus B. J. Spijkerman