Patents Assigned to Ostro Gems
  • Method of producing gemstone quality topaz
    Patent number: 5477055
    Abstract: Gemstone quality topaz is produced by a procedure which involves irradiating the topaz with fast neutrons at elevated temperature to an exposure level of at least about 10.sup.17 cm.sup.-2 followed by irradiation with electrons or gamma rays.
    Type: Grant
    Filed: September 12, 1994
    Date of Patent: December 19, 1995
    Assignee: Ostro Gems
    Inventors: Kurt Skold, Erik Svendsen, William Yelon