Back to results
US 4,395,653 AGranted
Electric lamp with neodymium oxide vitreous coating
AssigneeGeneral Electric Company
InventorWilliam A. Graff
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeGeneral Electric Company
InventorWilliam A. Graff
Estimating the term…
Selective light absorption coatings are provided for electric lamps which comprise a transparent vitreous frit containing neodymium oxide to selectively absorb radiation in the green and yellow wavelength region of the visible spectrum while transmitting the remaining visible radiation. A preferred vitreous frit is zinc borosilicate glass containing neodymium oxide which can be fired as an enamel coating on the exterior surface of the soda-lime glass envelope customarily employed for incandescent lamps. In a different preferred embodiment, the transparent vitreous frit containing neodymium oxide is admixed with an inorganic particulate filler and said mixture electrostatically deposited on the interior surface of the lamp glass envelope.
An electric lamp which includes a light transparent glass envelope, a visible light source located within said envelope, and a coating which contains neodymium oxide melted into a transparent vitreous frit which is deposited on the surface of said envelope to absorb light emitted by said light source selectively in the green and yellow wavelength region of the visible spectrum.
An incandescent lamp comprising a sealed soda-lime glass envelope, a pair of lead-in wires hermetically sealed within said envelopes, and a resistive filament connected to said lead-in wires, the improvement which consists of a glossy coating of a transparent vitreous frit containing neodymium oxide being fired on the outer surface of said glass envelope to absorb light selectivity in the green and yellow wavelength region from the radiation that is being emitted by the resistive filament without producing significant reduction in the remaining transmitted visible light.
An incandescent lamp comprising a sealed soda-lime glass envelope, a pair of lead-in wires hermetically sealed within said envelope, and a resistive filament connected to said lead-in wires, the improvement which consists of an electrostatically deposited coating on the inner surface of said glass envelope to absorb light in the green and yellow wavelength region of the spectrum without reducing the light output of said lamp more than approximately 15%, said coating comprising a physical mixture of a vitreous frit containing neodymium oxide dispersed therein with silica powder.
Dependencies are inferred from the claim text.