Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Reexamination Certificate
2007-03-28
2011-10-18
Group, Karl (Department: 1731)
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
C501S051000, C501S078000, C501S079000, C065S064000, C065S126000, C065S127000
Reexamination Certificate
active
08039408
ABSTRACT:
The optical glass of the present invention has a refractive index ndof 1.70 or greater and an Abbé number of 50 or greater. Given as mole percentages, it comprises:B2O320 to 80 percent,SiO20 to 30 percent,Li2O1 to 25 percent;ZnO0 to 20 percent,La2O34 to 30 percent,Gd2O31 to 25 percent,Y2O30 to 20 percent,ZrO20 to 5 percent,MgO0 to 25 percent,CaO0 to 15 percent,SrO0 to 10 percent,with the combined quantity of the above components being 97 percent or greater. The molar ratio of {ZnO/(La2O3+Gd2O3+Y2O3)} is 0.8 or less and the molar ratio of {(CaO +SrO+BaO)/(La2O3+Gd2O3+Y2O3)} is 0.8 or less. Ta2O5may be incorporated as an optional component, with the molar ratio {(ZrO2+Ta2O5)/(La2O3+Gd2O3+Y2O3)}being 0.4 or less. The present invention further relates to a preform for precision press molding comprised of this glass, an optical element comprised of this glass, and methods of manufacturing the same.
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Bolden Elizabeth A
Group Karl
Hoya Corporation
Sughrue & Mion, PLLC
LandOfFree
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