On May 23, 1995 the United States Patent Office issued a patent titled "Centrifuge process to separate the isotopes of uranium hexafluoride" to Dr. Qadir in which it was acknowledged by the Patent Office that method gives a complete istopic separation of U-235 from U-238 with a purity of almost 100% in a single stage. Details of this patent can be seen at the web site of the Patent Office under patent number 5,417,944.