Optical glass

Details Optical glass Optical glass

1975-01-03

1976-05-25

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 53, 106 54, 106 47R, C03C 304, C03C 310, C03C 308, C03C 300

Patent

active

039589994

ABSTRACT:
A thorium oxide-free B.sub.2 O.sub.3 --La.sub.2 O.sub.3 --Gd.sub.2 O.sub.3 --Ta.sub.2 O.sub.5 system optical glass is improved in stability to devitrification and in optical constants by introducing at least one of a divalent metal oxide such as ZnO, CdO, PbO, BaO, SrO, CaO, and MgO into the optical glass composition or replacing Ta.sub.2 O.sub.5 of the optical glass composition with a divalent metal oxide. If desired, the glass may be free of CdO.

REFERENCES:
patent: 2678281 (1954-05-01), Geffcker
patent: 2899322 (1959-08-01), Bromer et al.
patent: 2996392 (1961-08-01), Bromer et al.
patent: 3006776 (1961-10-01), Geffcker et al.
patent: 3074805 (1963-01-01), Geffcker et al.
patent: 3081178 (1963-03-01), Weissenberg et al.
patent: 3320170 (1967-05-01), Vickey et al.
patent: 3563773 (1971-02-01), Bromer et al.
patent: 3615762 (1971-10-01), Parry et al.
patent: 3615769 (1971-10-01), Leitz et al.
patent: R21175 (1939-08-01), Morey
Abs. 700,156, 12/1949, DePaolis.

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