Patents by Inventor Sije Boonstra

Sije Boonstra 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 and apparatus for washing and cleaning membrane filtration units
    Patent number: 4361485
    Abstract: Method of and apparatus for washing and cleaning membranes of a plurality of membrane filtration units aligned in series, each unit being part of a circuit provided with a recirculation pump, each circuit being provided with an inlet and an outlet. Washing liquid is supplied to the circuits in an amount exceeding the predetermined capacity of the recirculation pump.
    Type: Grant
    Filed: July 1, 1980
    Date of Patent: November 30, 1982
    Assignee: Wafilin B.V.
    Inventor: Sije Boonstra