Patents by Inventor Tjebbe R. Pasma

Tjebbe R. Pasma 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).

  • Picture display device with interference suppression means
    Patent number: 4947083
    Abstract: A picture display device having a display tube and a deflection unit comprising a field deflection coil and a line deflection coil is disclosed. To comply with a predetermined interference radiation standard, the picture display device is provided with one interference suppression coil or with a system of interference suppression coils, which interference supression coil or system of interference suppression coils is oriented and can be energized in such a manner that, measured at a predetermined distance from the picture display device, the strength of the local magnetic dipole field is below a desired standard.
    Type: Grant
    Filed: January 13, 1988
    Date of Patent: August 7, 1990
    Assignee: U.S. Philips Corporation
    Inventors: Gerrit Bosch, Tjebbe R. Pasma, Albertus A. S. Sluyterman
  • Picture display device with interference suppression means
    Patent number: 4914350
    Abstract: Picture display device having a display tube and a deflection unit comprising a field deflection coil and a line deflection coil. To comply with a predetermined interference radiation standard, the picture display device is provided with one interference suppression coil or system of interference suppression coils is orientated and can be energized in such a manner that, measured at a predetermined distance from the picture display device, the strength of the dipole component is below a desired standard.
    Type: Grant
    Filed: February 14, 1989
    Date of Patent: April 3, 1990
    Assignee: U.S. Philips Corporation
    Inventors: Gerrit Bosch, Tjebbe R. Pasma, Albertus A. S. Sluyterman
  • Picture display device with stray field compensation means
    Patent number: 4857805
    Abstract: Picture display device having a display tube and a deflection unit (9) comprising a field deflection coil and a line deflection coil (11). In order to comply with a predetermined interference radiation standard, the picture display device is provided with a compensation coil system having a first set of compensation coils (18, 19) for generating a dipole compensation field and possibly a second set of compensation coils (18a, 19a) for generating a fourpole compensation field, the compensation coil system being preferably arranged in series with the line deflection coil 11 ) and being provided with electric means (R; R.sub.1 ; R.sub.2 ; R.sub.3 ; R.sub.4) to shift the phase of the current through at least a part of the compensation coil system with respect to the phase of the current through the line deflection coil.
    Type: Grant
    Filed: April 28, 1988
    Date of Patent: August 15, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Gerrit Bosch, Tjebbe R. Pasma, Albertus A. S. Sluyterman, Fransiscus M. P. P. Doomernik, Steven M. Wielink