U.S. Philips Corporation

Hendrik Verweij

Jan Haisma

Hendrik J Joormann

Arend Schuurman

Paulus H Offermans

Andreas P Krebbers

A steam iron having an acid-resistant, hydrophilic coating in the steam chamber. The steam chamber coating is provided from an acid, colloidal suspension comprising alumina, magnesia, silica, or mixtures thereof, and contains, preferably, an acid phosphate compound. In this case, particularly Al(H.sub.2 PO.sub.4).sub.3 is very suitable. The steam chamber coating is very corrosion-resistant.

Steam iron having a hydrophilic acid resistant steam changer

Glasses consisting of 45-55 mol. % P.sub.2 O.sub.5, 15-40 mol. % BaO, 5-15 mol. % Li.sub.2 O, 5-35 mol. % PbO, 0-2 mol. % Al.sub.2 O.sub.3 and 0-6 mol. % F are suitable for the precision pressing of lenses.

Glass and glass objects

Glass objects, lenses in particular, can be pressed with precision from a glass which contains 45-55 mol. % P.sub.2 O.sub.5, 15-40 mol. % BaO, 5-15 mol. % Li.sub.2 O, 5-35 mol. % PbO, 0-2 mol. % Al.sub.2 O.sub.3 and 0-6 mol. % F.

Precision pressed glass object

Glass objects, lenses in particular, can be pressed with precision from a glass which contains 45-55 mol. % P.sub.2 O.sub.5, 15-40 mol. % BaO, 5-15 mol. % Li.sub.2 O, 5-35 mol. % PbO, 0-2 mol. % Al.sub.2 O.sub.3 and 0-6 mol. % F. A cube of glass is made from the above composition and preheated to a temperature of 20.degree.-60.degree. C. above the American softening point to obtain a polishing effect. The preheated cube is then inserted into preheated dies which are closed to form a precision pressed object of the glass.

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Eindhoven, Netherlands

Hendrik Verweij