Set of paving stones, particularly set of concrete paving stones
Patent 4792257 Issued on December 20, 1988. Estimated Expiration Date: 
September 11, 2007. 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.
September 11, 2007. 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 ReferencesInventorAssigneeApplicationNo. 07/095190 filed on 09/11/1987US Classes:404/41, Interfitting404/39, Bevel or incline edge404/42, Patterned52/384, VENEER TILES HELD BY NONLOAD-BEARING GRID52/392Integral edge engaging spacing feature on tileExaminersPrimary: Novosad, Stephen J.Assistant: Letchford, John F. Attorney, Agent or FirmInternational ClassE01C 5/06 (20060101)Foreign Application Priority Data1986-09-12 DEAbstractA paving stone set includes a square paving-stone, a larger rectangular paving-stone and a smaller rectangular paving-stone. Each of the paving stones has generally planar top and bottom surfaces and generally planar side walls, with a clothoid shaped surface being formed on two corners of each paving-stone. The radius of curvature of each clothoid shaped surface may be different from that of the other clothoid shaped surfaces on each paving-stone. The top surface may have a different color and texture than the bottom surface. The paving-stones may be irregularly broken surfaces. | |
