Patents by Inventor Stephan Vermeij

Stephan Vermeij 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).

  • Apparatus and method for the continuous cultivation of microorganisms in a culture liquid
    Patent number: 4888294
    Abstract: Cultivation tank (1) for continuous cultivation of cells or micro-organisms, containing a rotating separating device (11,12) for separating suspended cells from cultivation liquid (10) supplied continuously through a supply (4) and passed through the separating device (11,12) from the outside to the inside, cell free liquid being continuously discharged from within the separating device (11,12), the rotating parts (11,12) of the separating device being formed so that within the outer circumference a zone (15) is formed of a vortex-free, vertical rotating column of cultivation liquid from which the cells are radially thrown out by centrifugal forces into the surrounding liquid (10) through openings in the outlet circumference (11) of the separating device (11,12) are considerably greater than the size of the cells.
    Type: Grant
    Filed: October 21, 1988
    Date of Patent: December 19, 1989
    Assignee: Nederlanden Vertegenwoordigd
    Inventors: Antonius L. Van Wezel, deceased, Hans H. De Haan, Stephan Vermeij