Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Reexamination Certificate
2011-08-09
2011-08-09
Group, Karl E (Department: 1731)
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
C501S045000, C501S047000, C065S063000, C065S102000, C065S127000
Reexamination Certificate
active
07994082
ABSTRACT:
Preforms for precision press molding made of optical glass, optical elements, and methods of manufacturing the same are provided. The preforms are suited to precision press molding having a broad range of dispersion characteristics, a low glass transition temperature, a low sag point, and good resistance to devitrification while containing no PbO. The optical element is obtained by precision press molding the preform. One example of the preform has a refractive index (nd) of greater than or equal to 1.7 and an Abbé number (vd) of less than or equal to 32. The other example of the preform has an Abbé number (vd) exceeding 32.
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Fujiwara Yasuhiro
Kasuga Yoshiko
Zou Xuelu
Bolden Elizabeth A
Group Karl E
Hoya Corporation
Sughrue & Mion, PLLC
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