Patents by Inventor Karl-Jonas Jonasson

Karl-Jonas Jonasson 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).

  • Constant pressure regulation of grader blades
    Patent number: 5044446
    Abstract: By providing the work blade of a grader with a hydraulic regulation system where pressure limiting valves (14, 15, 16, 17) guide pressure reducing valves (10, 11, 12, 13) a constant pressure regulation of the work blade is achieved so that the work pressure set by the operator from his cab is maintained almost independent of the irregularities of the underlying surface.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: September 3, 1991
    Assignee: Maskin AB Tube
    Inventors: Karl-Jonas Jonasson, Bo Tiback, Lars-Ake Hedberg, Alf Wallin