Concrete retaining wall block
Patent 4671706 Issued on June 9, 1987. Estimated Expiration Date: 
December 11, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 11, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3269125 Earth retaining system Construction units for the erection of walls and method of utilization Patent #: 4524551 InventorApplicationNo. 06/789014 filed on 12/11/1985US Classes:405/286, Concrete52/592.6, Designed for stacking (e.g., key on top surface, mortise on bottom)52/608Nonrectangular cross-sectionExaminersPrimary: Corbin, David H.International ClassE02D 29/02 (20060101)Foreign Application Priority Data1985-10-17 CAAbstractThis concrete retaining wall block comprises a flat, elongated base, two side walls upstanding from the longitudinal sides of the base, a front panel upstanding from the base and joining with the side walls; the top edge of each side wall is provided with a series of notches, the notches of both side walls registering in pairs transversely of the block. The front panel forms a transverse ridge downwardly protruding from the base and adapted to engage any selected notch of a subjacent block, whereby the slope of a retaining wall built of such blocks can be varied and yet the blocks are all laid out horizontally, permitting to use a horizontal foundation for the wall. | |
