U.S. Philips Corporation

Cornelis Machiel Verheij

Dragutin Radielovic

Mercury vapor discharge lamp, in particular low pressure mercury vapor discharge lamp, for color copying by electrophotographic processes, which lamp has a luminescent layer which emits in a band in the blue part, in a band in the green part and in a band in the red part of the spectrum. The luminescent layer comprises two luminescent materials the first of which emits both in the said blue part and in the said green part of the spectrum, while the second emits in the said red part of the spectrum.

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Eindhoven, Netherlands

Cornelis Machiel Verheij