Optical: systems and elements – Lens
Reexamination Certificate
2008-01-29
2008-01-29
Spector, David N. (Department: 2873)
Optical: systems and elements
Lens
C359S754000, C359S796000, C501S011000, C501S032000
Reexamination Certificate
active
11523845
ABSTRACT:
The optical elements are made from an opto-ceramic material that is characterized by high density, transparency for visible light and IR, high refractive index, high Abbe number and outstanding relative partial dispersion. Mixed oxides are sintered to obtain the opto-ceramic material. The mixed oxides contain zirconium oxide and hafnium oxide mixed with one or more oxides of yttrium, scandium, lanthanide elements, and optionally mixed with one or more of SiO2, Na2O, and TiO2. Alternatively the mixed oxides contain zirconium oxide and hafnium oxide mixed with CaO and/or MgO and optionally mixed with one or more of SiO2, Na2O, and TiO2. In addition, the mixed oxides can also include one or more oxides of Al, Ga, In, and Sc; optionally one or more oxides of yttrium, some lanthanide elements; and optionally one or more of SiO2, Na2O, MgO, CaO, and TiO2.
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Alkemper Jochen
Beier Wolfram
Hayden Joseph S.
Lentes Frank-Thomas
Letz Martin
Schott AG
Spector David N.
Striker Michael J.
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