1
Anne Shaw: Half block for multi-level interlocking blocks. August 23, 2011: US08002241 (26 worldwide citation)

The present invention is a unitary piece block formed of polymers (such as polystyrene or other high strength polymer) by a single injection molding step which are assembled into a recreational vehicle leveler. The invention ramp provides four sets of four connectors at a top of a floor plate, which ...


2
Anne Shaw: Multi-level interlocking blocks. August 26, 2008: US07416166 (18 worldwide citation)

The present invention is a unitary piece block formed of polymers (such as polystyrene or other high strength polymer) by a single injection molding step which are assembled into a recreational vehicle leveler. The invention ramp provides four sets of four connectors at a top of a floor plate, which ...