Paving stone, process for manufacturing same and device for carrying out the manufacturing process
Patent 4627764 Issued on December 9, 1986. Estimated Expiration Date: 
January 17, 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.
January 17, 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 572762 829480 2108226 3242832 3870423 3873225 3891340 3922105 Apparatus for manufacturing rough faced bricks Ground covering slab InventorApplicationNo. 06/692329 filed on 01/17/1985US Classes:404/41, Interfitting404/39, Bevel or incline edge404/42, Patterned52/314, Facer formed to simulate multiple units52/605Grooves on juncture faceExaminersPrimary: Novosad, Stephen J.Assistant: Letchford, John F. Attorney, Agent or FirmInternational ClassesE01C 5/00 (20060101)B28B 7/34 (20060101) B28B 7/00 (20060101) B28B 7/36 (20060101) Foreign Application Priority Data1981-03-25 EPAbstractThe paving stone comprises a recess which divides the stone into an upper part having a smaller circumference and a lower part with a greater circumference. The lower part, having also a greater height than the upper part, comprises a ribbing or other vertically oriented interlocking means and the upper part can have the appearance of a natural stone. The shape of either the upper or the lower part may be chosen arbitrarily and independent from each other. The molding box for the manufacturing of such paving stones is made of two pieces joined together and comprises the corresponding recess. The lower piece comprises an insert for forming interlocking means. | |
