Patents Assigned to Theodore Aaron Litovits
  • Joint doping of porous glasses to produce materials with high modifier concentrations
    Patent number: 4299608
    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: September 14, 1979
    Date of Patent: November 10, 1981
    Assignees: Pedro Buarque de Macedo, Theodore Aaron Litovits
    Inventors: Pedro B. Macedo, Mrinmay Samanta, Joseph H. Simmons
  • Joint doping of porous glasses to produce materials with high modifier concentrations
    Patent number: 4188198
    Abstract: A glass article is produced by doping a porous glass matrix with at least one member selected from the group consisting of PbO and Bi.sub.2 O.sub.3 and at least one member selected from the group consisting of K.sub.2 O, Rb.sub.2 O and Cs.sub.2 O, and producing a profile in dopant composition by immersion in a multiple-solvent solution.
    Type: Grant
    Filed: November 23, 1977
    Date of Patent: February 12, 1980
    Assignees: Pedro Buarque de Macedo, Theodore Aaron Litovits
    Inventors: Pedro B. Macedo, Joseph H. Simmons, Mrinmay Samanta
  • 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
  • Optical fiber with compression surface layer
    Patent number: 4181403
    Abstract: A glass dielectric fiber waveguide with a composition profile varying radially from the center to the surface, the composition profile causing a surface layer which is in compression, said composition profile being caused by (a) at least one dopant used substantially to create a stress profile wherein the surface is in compression, and (b) at least one dopant used substantially for the purpose of creating an index of refraction profile.
    Type: Grant
    Filed: December 30, 1976
    Date of Patent: January 1, 1980
    Assignees: Pedro Buarque De Macedo, Theodore Aaron Litovits
    Inventors: Pedro B. Macedo, Robert K. Mohr, Prabhat K. Gupta