Brilliantized step cut diamond
Patent 4020649 Issued on May 3, 1977. Estimated Expiration Date: 
May 3, 1994. 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.
May 3, 1994. 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 138314 2265316 3796065 InventorApplicationNo. 05/690401 filed on 05/27/1976US Classes:63/32, GEMD11/90FacetedExaminersPrimary: Shay, F. BarryAttorney, Agent or FirmInternational ClassA44C 17/00 (20060101)AbstractA step cut stone with a straight edged polygonal shaped girdle has a generally pyramidal base and a crown with at least girdle and table breaks wherein at least one of these breaks is cut with triangular shaped facets. | |
