Patents by Inventor Hugo K. Krop

Hugo K. Krop 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).

  • Authenticity mark, document carrying such mark, and process and device for reading and validating such mark
    Patent number: 5018830
    Abstract: Authenticity mark consisting of pattern of randomly divided granules attached to a delimited surface area of a substrate. The granules consist of retroreflective microspheres with a diameter smaller than 500 micron and that the number of microspheres is selected such that between 20% and 80% of the available surface of the delimited area is covered by the microspheres.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: May 28, 1991
    Assignee: Homer, Hollandse Meet- En Regelsystemen B.V.
    Inventor: Hugo K. Krop
  • Low power, stepping motor with display
    Patent number: 4831293
    Abstract: A stepping motor with a permanently magnetized rotor disc mounted on a shaft and with at least one air-core coil for the excitation of a magnetic field. Each coil has been wound in a plane in which the normal to the windings of each coil is perpendicular to the rotor shaft, and in which the rotor disc intersects each coilwinding plane.
    Type: Grant
    Filed: May 29, 1987
    Date of Patent: May 16, 1989
    Assignee: Text Lite B.V.
    Inventor: Hugo K. Krop
  • Display device
    Patent number: D280424
    Type: Grant
    Filed: July 26, 1982
    Date of Patent: September 3, 1985
    Assignee: Text Lite BV
    Inventor: Hugo K. Krop
  • Portable telex terminal case or the like
    Patent number: D282164
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: January 14, 1986
    Assignee: Text Lite B.V.
    Inventor: Hugo K. Krop