Patents Examined by Frank W. Mien
  • Joint doped porous glass article with high modifier concentrations
    Patent number: 4183620
    Abstract: A glass composition having at least 85 mole percent of SiO.sub.2, where the improvement comprises at least 7 wt percent of at least one member selected from the group consisting of PbO and Bi.sub.2 O.sub.3 and at least 1.5 mole percent of at least one member selected from the group consisting of K.sub.2 O, Rb.sub.2 O and Cs.sub.2 O.
    Type: Grant
    Filed: December 30, 1976
    Date of Patent: January 15, 1980
    Assignees: Pedro Buarque De Macedo, Theodore Aaron Litovits
    Inventors: Pedro B. Macedo, Mrinmay Samanta, Joseph H. Simmons