Patents Assigned to Douglas Neil Foster
  • Armour unit for wave energy absorption
    Patent number: 4172680
    Abstract: A breakwater, or similar structure, comprising a core of rubble, and an armouring layer overlying said core, said armouring layer being composed of individual armour units of hexagonal outer cross-section arranged in a honeycomb array, each of said armour units having an elongated, concrete body with longitudinal through water-passage means so that the porosity of the exposed face of the armouring layer is solely determined by the ratio of the cross-sectional area of said water passage means to the cross-sectional area of the concrete body.
    Type: Grant
    Filed: December 28, 1977
    Date of Patent: October 30, 1979
    Assignees: Douglas Neil Foster, Unisearch Limited
    Inventor: Christopher T. Brown