Patents by Inventor Martin C. Van der Heijde

Martin C. Van der Heijde 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).

  • Electromagnetic deflection unit and color display tube provided with such a unit
    Patent number: 4535313
    Abstract: An electromagnetic deflection unit has a conical coil holder with a flange which carries coils for the horizontal deflection of electron beams. The coils have segments extending substantially in the longitudinal direction of the coil holder and near these segments are arranged soft-magnetic members on the inwardly directed side of the coils in order to influence the magnetic field of these coils and hence to reduce convergence errors. The soft-magnetic members are incorporated, in a configuration suitable for the relevant type of deflection unit, in a moulded annular body of synthetic material.
    Type: Grant
    Filed: September 18, 1984
    Date of Patent: August 13, 1985
    Assignee: U.S. Philips Corporation
    Inventor: Martin C. Van der Heijde