Patents Examined by P. Bruce Breneman
  • Crystalline silicas
    Patent number: 4781906
    Abstract: A novel crystalline silica composition having a silica to alumina atomic ratio not lower than 80 and having a certain specific X-ray diffraction pattern after calcination in air for at least 3 hours at a temperature of at least 500.degree. C.
    Type: Grant
    Filed: December 19, 1983
    Date of Patent: November 1, 1988
    Assignee: Labofina, S.A.
    Inventors: Raymond M. Cahen, Guy L. G. Debras, Georges E. M. J. DeClippeleir