Diamond cut
Patent 6449985 Issued on September 17, 2002. Estimated Expiration Date: 
September 14, 2020. 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 14, 2020. 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 D58318 D59298 D59299 D81382 2143084 2265316 Brilliantized step cut diamond D251659 High brilliance step-cut stone and method of making same InventorAssigneeApplicationNo. 662497 filed on 09/14/2000US Classes:63/32, GEMD11/89, Jewel, gem or signetD11/90FacetedExaminersPrimary: Lavinder, JackAssistant: Chop, Andrea Attorney, Agent or FirmForeign Patent References
International ClassA44C 017/00AbstractA mixed cut gemstone having a brilliant cut crown, a girdle and a step cut pavilion. The step cut pavilion contains four rib lines running from the girdle to a culet, which can be a line or a point. These rib lines subdivide the pavilion into four sides, which, if the girdle is shaped like a square, are equivalent, and, if the girdle is shaped like a rectangle, then any two opposing sides are equivalent. The pavilion contains a multitude of steps, which add to an elegant and classic look of the gemstone. The crown contains a flat table in a form of a diamond, four corner facets and four upper girdle facets, thus, creating superior factors of dispersion, brilliance and scintillation. The table is slightly elevated due to the angles that the four corner facets and four upper girdle facets form with the girdle. | |
