Electric lamp with a coating containing a metal oxide pigment for displaying formation
AssigneeU.S. Philips Corporation
InventorsAnna L. Bouwkamp-Wijnoltz, Petrus E. J. Legierse, Guybert M. C. Derks
Life of this patent
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Abstract
The electric lamp has an information-displaying external coating (3) which is provided on the lamp envelope. The coating (3) comprises a metal oxide as the pigment, which is dispersed in a polysiloxane matrix which may contain lithium. The coating (3) is obtained by using a marking ink, which may be applied by means of an ink jet printing process.
Claims13
An electric lamp comprising a translucent lamp envelope (1) in which an electric element (2) is arranged, and a cap (4) connected to said envelope (1), an outer surface of said lamp (1) being provided with a black coating (3) displaying information and comprising a pigment and a binder, wherein the pigment consists essentially of an iron-containing mixed oxide, which pigment is dispersed in a polysiloxane-containing matrix.
A marking ink for use on an electric lamp, comprising a black pigment, a binder and a diluent, wherein the pigment consists essentially of an iron-containing mixed oxide and the binder is selected from the group formed by silicone resin, silicone polyester and mixtures of silicone resin and polyester.
Dependencies are inferred from the claim text.