Patents by Inventor Sjoerd W. H. De Haan

Sjoerd W. H. De Haan 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).

  • Treatment apparatus and method for preserving pumpable food products in a pulsed electric field
    Publication number: 20020170439
    Abstract: An apparatus for preserving food products in a pulsed electric field comprises a treatment chamber having an inlet for food products to be treated and an outlet fortreated food products and has an effective area of flow having rounded corners. The treatment chamber further comprises at least one first electrode and at least one second electrode which are disposed in such a way that the field lines of the electric field run parallel to one another, as well as an energy source and a potential controller to control the potential on at least one first electrode and on at least one second electrode in order to generate a pulsed electric field, of such design that the electric field in the effective area of flow is constant. In a method for preserving food products in a pulsed electric field, the direction of said pulsed electric field in successive pulses is rotated through 90°.
    Type: Application
    Filed: May 10, 2002
    Publication date: November 21, 2002
    Applicant: Stork Food & Dairy Systems, B.V.
    Inventors: Petrus Henricus F. Morshuis, Henricus F. M. van den Bosch, Sjoerd W. H. De Haan, Jan A. Ferreira
  • Treatment apparatus and method for preserving pumpable food products in a pulsed electric field
    Patent number: 6393975
    Abstract: An apparatus for preserving food products in a pulsed electric field comprises a treatment chamber having an inlet for food products to be treated and an outlet fortreated food products and has an effective area of flow having rounded corners. The treatment chamber further comprises at least one first electrode and at least one second electrode which are disposed in such a way that the field lines of the electric field run parallel to one another, as well as an energy source and a potential controller to control the potential on at least one first electrode and on at least one second electrode in order to generate a pulsed electric field, of such design that the electric field in the effective area of flow is constant.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: May 28, 2002
    Assignee: Stork Food and Dairy Systems B.V.
    Inventors: Petrus Henricus F. Morshuis, Henricus F. M. Van Den Bosch, Sjoerd W. H. De Haan, Jan A. Ferreira
  • Treatment apparatus and method for preserving pumpable food products in a pulsed electric field
    Publication number: 20010017082
    Abstract: An apparatus for preserving food products in a pulsed electric field comprises a treatment chamber having an inlet for food products to be treated and an outlet fortreated food products and has an effective area of flow having rounded corners. The treatment chamber further comprises at least one first electrode and at least one second electrode which are disposed in such a way that the field lines of the electric field run parallel to one another, as well as an energy source and a potential controller to control the potential on at least one first electrode and on at least one second electrode in order to generate a pulsed electric field, of such design that the electric field in the effective area of flow is constant. In a method for preserving food products in a pulsed electric field, the direction of said pulsed electric field in successive pulses is rotated through 90°.
    Type: Application
    Filed: January 31, 2001
    Publication date: August 30, 2001
    Applicant: Stork Food & Dairy Systems B.V.
    Inventors: Petrus Henricus F. Morshuis, Henricus F. M. van den Bosch, Sjoerd W.H. de Haan, Jan A. Ferreira
  • Method and device for continuous adjustment and regulation of transformer turns ratio, and transformer provided with such device
    Patent number: 5969511
    Abstract: In a method and a device for continuously adjusting, within a certain adjustment range, the turns ratio between the primary winding and the secondary winding of a power transformer provided with at least one regulating winding, a first tap is switched on during a portion of a cycle of the alternating voltage of the transformer and a second tap is switched on during another portion of the cycle of the alternating voltage. For this purpose, the device comprises electronic switches in the form of thyristors or transistors.
    Type: Grant
    Filed: January 30, 1998
    Date of Patent: October 19, 1999
    Assignee: N.V. Eneco
    Inventors: Paulus G. J. M. Asselman, Jan Hendrik Griffioen, Pavol Bauer, Gerardus Chr. Paap, Sjoerd W. H. de Haan, Cornelis J. van de Water