Patents Assigned to SF-Sten A/S
  • Concrete paving stone and method of manufacturing same
    Patent number: 4127349
    Abstract: A concrete paving stone having single flags held together with a number of concrete ribs between adjacent stones such that the ribs will resist breaking during ordinary handling but will break upon the application of vibration after the paving stone is laid on a level sand bed to thereby provide a number of unconnected flags.
    Type: Grant
    Filed: April 21, 1977
    Date of Patent: November 28, 1978
    Assignee: SF-Sten A/S
    Inventor: Knud A. Rasmussen