Patents by Inventor Robert S. Greeff

Robert S. Greeff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6363745
    Abstract: A cut cornered mixed-cut square gemstone comprises a step-cut crown, with two steps and a table, a girdle and a pavilion. The crown and pavilion are substantially square with four equal sides, and corners about ⅓ the length of the sides. The pavilion sides and corners are defined by eight rib lines which extend substantially continuously from the girdle to a culet. Each pavilion side and corner has four facets, including a lower girdle star facet, two lower girdle facets and a lower bezel facet. The gemstone has the classic elegance of a step cut in the crown and attempts to achieve the good dispersion of a brilliant cut in the pavilion.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: April 2, 2002
    Assignee: Tiffany and Company
    Inventor: Robert S. Greeff
  • Patent number: 5970744
    Abstract: A cut cornered mixed-cut square gemstone comprises a step-cut crown, with two steps and a table, a girdle and a pavilion. The crown and pavilion are substantially square with four equal sides, and corners about 1/3 the length of the sides. The pavilion sides and corners are defined by eight rib lines which extend substantially continuously from the girdle to a culet. Each pavilion side and corner has four facets, including a lower girdle star facet, two lower girdle facets and a lower bezel facet. The gemstone has the classic elegance of a step cut in the crown and attempts to achieve the good dispersion of a brilliant cut in the pavilion.
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: October 26, 1999
    Assignee: Tiffany and Company
    Inventor: Robert S. Greeff
  • Patent number: D442114
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: May 15, 2001
    Assignee: Tiffany and Company
    Inventor: Robert S. Greeff
  • Patent number: D463315
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: September 24, 2002
    Assignee: Tiffany And Company
    Inventor: Robert S. Greeff