U.S. Philips Corporation

Johannes H Van De Heuvel

Gertraud Agnes Meden-Piesslinger

Optical components can be pressed with such a precision that grinding and polishing of the formed components is not necessary, from glasses containing 45-55 wt. % P.sub.2 O.sub.5, 3.5-9 wt. % Al.sub.2 O.sub.3, 5-20 wt. % K.sub.2 O, 0-3 wt. % Li.sub.2 O, 8-15% BaO, 4.5-9 wt. % ZnO, 0-6 wt. % MgO, 0-18 wt. % PbO, 0-1 wt. % SiO.sub.2, 0-3 wt. % B.sub.2 O.sub.3, 0-2 wt. % TiO.sub.2.

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Eindhoven, Netherlands

Johannes H Van De Heuvel