Patents Assigned to Permavoid Ltd
  • Structural module
    Patent number: 7704011
    Abstract: A sub-base layer for use in construction, comprises a plurality of connected substantially cuboid modules each having spaced-apart, substantially parallel top and bottom walls joined by a peripheral sidewall defining an enclosed volume. The connection between the modules is effected by a plurality of tie members which prevent lateral movement of the modules relative to one another. The layer is particularly useful as a lightweight replacement for aggregate sub-base layers in foundations, roadways, pavement, carparks, and the like.
    Type: Grant
    Filed: February 2, 2007
    Date of Patent: April 27, 2010
    Assignee: Permavoid Ltd
    Inventor: Richard Granville Marshall