Patents by Inventor Johannus B. J. Spijkerman

Johannus B. J. Spijkerman 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 the recovery of metallic lead from battery paste
    Patent number: 5514263
    Abstract: A process for the direct recovery of metallic lead from battery paste in an electrolysis unit is disclosed. The electrolysis unit consists of an anode compartment and a cathode compartment separated by an ion selective membrane. The cathode consists of a high surface area electrically conductive substrate. Solid particles of battery paste are introduced into the cathode compartment which contains a liquid electrolyte and a complexing agent. Metallic lead is electrochemically deposited on the cathode, and sulfuric acid is produced in the anode compartment.
    Type: Grant
    Filed: July 5, 1995
    Date of Patent: May 7, 1996
    Assignee: H. J. Enthoven Limited
    Inventors: Johannus B. J. Spijkerman, Rudolf J. M. Groenen
  • 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