Patents by Inventor Mark D. Neville

Mark D. Neville 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).

  • Patent number: 5584981
    Abstract: An electrochemical cell (50) for deionizsation utilizes electrochemical ion-exchange to remove ions from a feed solution. Under the influence of an electric field, ions are adsorbed into, are scored within and pass through a permeable layer (54, 64) of particulate ion-absorbing material and binder, the sheet being several millimeters thick. Water from the feed solution also permeates through the layer (54, 64), so a concentrated solution of the ions emerges from the rear (58) of the layer. The cell does not require separate sources of feed and eluant solutions and can be operated substantially continuously. In a modified cell (70) the flow path for the feed solution passes through a highly porous ion exchanger structure (77), which may be located between two such microporous layers (54, 64). Absorption in such a cell may be effective in the absence of an electric field, elution requiring the periodic application of the electric field.
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: December 17, 1996
    Assignee: United Kingdom Atomic Energy Authority
    Inventors: Andrew D. Turner, Christopher P. Jones, Mark D. Neville, Michael R. H. Hill
  • Patent number: 5545311
    Abstract: An electrically conducting filter medium (20) is cleaned in situ by applying, at intervals, a brief voltage pulse between the medium (20) and a counter electrode (18) so the process liquid undergoes electrolysis. The cleaning process is significantly improved by occasionally applying a voltage of reverse polarity. For example a 5 second cleaning pulse making the filter medium (20) cathodic might be applied every quarter of an hour, and a reverse polarity pulse of similar duration applied every two hours. This process can significantly increase permeation rates.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: August 13, 1996
    Assignee: United Kingdom Atomic Energy Authority
    Inventor: Mark D. Neville
  • Patent number: 5536387
    Abstract: Effluent streams from photographic processes contain both silver and thiosulphate ions, and because of the formation of complex anions it is difficult to remove the silver. The silver may be removed using a cell (12) with a cathode (24) exposed to the effluent liquid, and an anode (25) separated from the liquid by a barrier (22) permeable at least to anions. Some silver sulphide is formed electrochemically at the cathode (24); at the anode (25) water is electrolysed and becomes acidic, so the complex anions migrating through the barrier (22) generate silver sulphide chemically. The resulting silver sulphide precipitate is separated from the liquid by a filter (14).
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: July 16, 1996
    Assignee: United Kingdom Atomic Energy Authority
    Inventors: Michael R. H. Hill, Mark D. Neville, Andrew D. Turner
  • Patent number: 5225056
    Abstract: A first metal, for example a transition metal such as cobalt, having an insoluble hydroxide is separated from a second metal such as lithium having a soluble hydroxide in an aqueous liquid containing dissolved cations of the metals. The cations are firstly absorbed onto a cation exchange material by electrochemical ion exchange and the second metal then selectively eluted by electrochemical ion exchange under sufficiently high pH conditions, e.g. to 10-13, in a closed loop. Finally, the transition metal is eluted by electrochemical ion exchange under sufficiently low pH conditions, e.g. acidic such as 1-2. The method is applicable to separating trace quantities of Co (e.g. as Co-60) from larger quantities of Li in aqueous solution.
    Type: Grant
    Filed: January 31, 1991
    Date of Patent: July 6, 1993
    Assignee: United Kingdom Atomic Energy Authority
    Inventors: Nevill J. Bridger, Mark D. Neville, Andrew D. Turner