Patents by Inventor Hendrik Van Der Wal

Hendrik Van Der Wal 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).

  • Spherical linkage and force feedback controls
    Patent number: 8371187
    Abstract: A user interface system comprises a plurality of linkages connected between a platform and a base. The linkages permit motion of the platform over at least a portion of a spherical surface. A support assembly coupled between the platform and the base comprises a spherical joint having a center of rotation substantially concentric with a center of the spherical surface. The spherical joint constrains motion of the platform to the spherical surface. The system may include a sensor corresponding to each linkage. Each sensor may be coupled to sense a movement of its corresponding linkage in response to motion of the platform over the portion of the spherical surface. A user-manipulable handle may be coupled to the platform so that the user can move the platform.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: February 12, 2013
    Assignee: Simon Fraser University
    Inventors: Shahram Payandeh, Hendrik Van der Wal, Temei Li
  • Spherical linkage and force feedback controls
    Publication number: 20090095108
    Abstract: A user interface system comprises a plurality of linkages connected between a platform and abase. The linkages permit motion of the platform over at least a portion of a spherical surface. A support assembly coupled between the platform and the base comprises a spherical joint having a centre of rotation substantially concentric with a centre of the spherical surface. The spherical joint constrains motion of the platform to the spherical surface. The system may include a sensor corresponding to each linkage. Each sensor may be coupled to sense a movement of its corresponding linkage in response to motion of the platform over the portion of the spherical surface. A user-manipulable handle may be coupled to the platform so that the user can move the platform.
    Type: Application
    Filed: December 12, 2005
    Publication date: April 16, 2009
    Inventors: Shahram Payandeh, Hendrik Van Der Wal, Temei Li
  • Television picture display device
    Patent number: 4750038
    Abstract: In a television picture display device which can display a compressed (by 13) sub-picture of a second video signal source (29) in a main picture of a first video signal source (1), a correct mutual location of the picture information in the sub-picture with respect to the main picture is always obtained by means of a first (55) and a second (119) even-odd field identification circuit for the sub-picture and for the main picture, respectively, an interlacing circuit (71) and an interlacing-correction circuit (125), so that troublesome phenomena no longer occur in the sub-picture upon field transitions.
    Type: Grant
    Filed: May 27, 1987
    Date of Patent: June 7, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Petrus W. G. Welles, Dionysius A. Boerrigter, Hendrik Van Der Wal, Pieter J. Zijlstra