Patent number: 6841937
Abstract: An electric lamp which is provided with an electric light source in a light-transmitting bulb provided with a coating comprising an inorganic colored pigment selected from the group formed by oxide nitride pigments of the general formula A1?xA?xBO2?xN1+x, wherein A=Mg, Ca, Sr, Ba, Zn, A?=Ln, Bi, Al, Fe, B=V, Nb, Ta, Mo, W and B?=Ti, Zr, Hf, Sn, Ge, Si, Nb, Ta and 0<x<1 or an oxide-nitride pigment of the general formula AB1?xB?xBO1+xN2?x, wherein A=Mg, Ca, Sr, Ba, Zn, A?=Ln, Bi, Al, Fe, B=V, Nb, Ta, Mo W and B?=Ti, Zr, Hf, Sn, Ge, Si, Nb, Ta and 0<x<1 or an oxide-nitride pigment of the general formula AyA?2?yB2O5+yN2?y, wherein A=Mg, Ca, Sr, Ba, Zn, A?=Ln, Bi, Al, Fe, B=V, Nb, Ta, Mo, W and B?=Ti, Zr, Hf, Sn, Ge, Si, Nb, Ta and 0<y<2 or an oxide-nitride pigment of the general formula A?2B2?yB?yO5+yN2?y, wherein A=Mg, Ca, Sr, Ba, Zn, A?=Ln, Bi, Al, Fe, B=V, Nb, Ta, Mo, W and B?=Ti, Zr, Hf, Sn, Ge, Si, Nb, Ta and 0<y<2 or an oxide-nitride pigment of the general formula CD2?mD?mO4
Type:
Grant
Filed:
May 24, 2001
Date of Patent:
January 11, 2005
Assignee:
Koninklijke Philips Electronics N.V.
Inventors:
Joachim Opitz, Sonja Louisa Leona Ceulemans
