Patents Assigned to Hanoch Stark
  • Device particularly useful for cutting or grinding round girdles of gems
    Patent number: 4233783
    Abstract: A cutting device is described particularly useful for cutting or grinding the round girdle surfaces of round-cut gems, the cutting device comprising a plurality of cutting heads each formed with a grinding surface on one face defined by a cavity circular in transverse section and having a larger diameter than that of the round surface to be cut. The device further includes a drive for rotating the heads around the longitudinal axis of its respective cavity, and nozzles for supplying liquid to the grinding surfaces of the cavities.
    Type: Grant
    Filed: January 26, 1979
    Date of Patent: November 18, 1980
    Assignee: Hanoch Stark
    Inventor: Hanoch Stark