Interlocking paving stone for open drainage ground cover pattern
Patent 5201843 Issued on April 13, 1993. Estimated Expiration Date: 
February 11, 2012. 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.
February 11, 2012. 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 D102145 572762 962150 1379440 1460516 2210150 3759043 3903702 Metallurgical vessel Paving stone InventorApplicationNo. 834127 filed on 02/11/1992US Classes:404/41, Interfitting404/42PatternedExaminersPrimary: Neuder, William P.Attorney, Agent or FirmForeign Patent References
International ClassE01C 005/00AbstractA paving stone that can be laid in one or more open patterns, permitting water to drain through areas in the formed ground cover, is provided. The stone has six interlocking multifaced side surfaces, three on a concave part of the stone and three on a convex part of the stone, that interlock with complimentary side surfaces of adjacent stones, and has eight corner side surfaces that bound and define the shape of drainage areas. Each of the drainage areas is surrounded by identical interlocking stones. In the preferred embodiment, the multifaced surfaces of each of the parts are identical so that the stones can be laid interchangeably at any place in a runner bond or herringbone pattern. The faces of the multifaced side surfaces of the stones are preferably planar and form V-shaped interlocking surfaces.Other References
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