Patents by Inventor Walterus Gijsberrus Joseph Van Der Meer

Walterus Gijsberrus Joseph Van Der Meer 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 and apparatus for removing floating substances and salts from a liquid by means of a membrane filtration
    Patent number: 6576136
    Abstract: A membrane filtration for removing floating substances and salts from a liquid, uses vertically positioned capillary or tube membranes which are suitable for performing nano or hyper-filtration. Repeatedly and consecutively the following steps are performed: a) a permeate is produced without discharge of concentrate for a predetermined period of time; b) then a gas, for example air, is guided along side the membrane, at least almost without discharge of permeate and without discharge of concentrate; c) and finally a concentrate is discharged without discharge of permeate. During step a) and step c) use can be made of a combined supply of liquid and gas. An apparatus for performing this method is described as well.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: June 10, 2003
    Assignees: DHV Water B.V., N.V. Waterleiding Friesland
    Inventors: Petrus Jacob De Moel, Walterus Gijsberrus Joseph Van Der Meer, Harm Van Dalfsen