Patents by Inventor Kurt Hesseldahl Christensen

Kurt Hesseldahl Christensen 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).

  • Vibration conveyors
    Patent number: 5931285
    Abstract: A driving system for vibration conveyors of the resonance type has an electromagnetic circuit with an electromagnet with a yoke, with respect to which a running measurement of the current and voltage of the electromagnet is performed, that the electric properties obtained for the electromagnetic circuit as a result of the measurement are used to calculate an instantaneous airgap between the electromagnet and yoke, the value of which is used as a control value for the drive current supplied to the electromagnet, so that an essentially sinusoidal oscillation with a desired amplitude is maintained.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: August 3, 1999
    Assignee: Poul Johansen Development A/S
    Inventors: Niels Bent Heegaard Madsen, Kurt Hesseldahl Christensen