US4395653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp with neodymium oxide vitreous coating
Assignee: General Electric Co
•
Filing: 1981-06-24
•
Granted: 1983-07-26
•
Expires: 2001-06-24
Abstract
Abstract 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.
Inventors
- 👤 William A. Graff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:54
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/28; H01K1/32
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
60 words
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.
Claim 2
Dependent Claim
60 words
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.
Claim 3
Dependent Claim
29 words
An electric lamp as in claim 1 having an incandescent filament located within the glass envelope and with said coating being on the outer surface of said glass envelope.
Claim 4
Dependent Claim
31 words
An electric lamp as in claim 2 wherein the glass envelope is formed with soda-lime glass and the vitreous frit has been fired on the outer surface of said glass envelope.
Claim 5
Dependent Claim
39 words
An electric lamp as in claim 1 having an incandescent filament located within a glass envelope with said coating comprising a powdered vitreous frit containing neodymium oxide having been electrostatically deposited on the inner surface of said glass envelope.
Claim 6
Dependent Claim
22 words
An electric lamp as in claim 4 wherein said coating comprises a mixture of said vitreous frit with an inorganic particulate filler.
Claim 7
Dependent Claim
16 words
An electric lamp as in claim 5 wherein the glass envelope is formed with soda-lime glass.
Claim 8
Dependent Claim
86 words
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.
Claim 9
Dependent Claim
86 words
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.
Claim 10
Dependent Claim
19 words
An incandescent lamp as in claim 7 wherein the vitreous frit is a zinc borosilicate glass containing neodymium oxide.
Claim 11
Dependent Claim
67 words
An incandescent lamp as in claim 8 wherein the vitreous frit composition comprises in approximate weight percent: 10-20 ZnO, 8-20 SiO 2 , 15-20 B 2 O 3 , 0-2 Al 2 O 3 , 30-40 Nd 2 O 3 , 1-2 Na 2 O, 6-8 K 2 O, 0-5 BaO, 0-5 CaO, 1-3 ZrO 2 , and 1-3 F except for residual impurities and refining agents.
Claim 12
Dependent Claim
88 words
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.
Claim 13
Dependent Claim
88 words
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.
Claim 14
Dependent Claim
34 words
An incandescent lamp as in claim 10 wherein the silica powder contains diatomaceous silica and a light refractive particulate material selected from the group consisting of alumina, silica, aluminosilica, calcium carbonate, and mixtures thereof.
Claim 15
Dependent Claim
19 words
An incandescent lamp as in claim 10 wherein the vitreous frit is a zinc borosilicate glass containing neodymium oxide.
Claim 16
Dependent Claim
67 words
An incandescent lamp as in claim 10 wherein the vitreous frit composition comprises in approximate weight percent: 7-15 ZnO, 8-18 SiO 2 , 9-19 B 2 O 3 , 0-2 Al 2 O 3 , 40-70 Nd 2 O 3 , 1-2 Na 2 O, 2-6 K 2 O, 0-1 TiO 2 , 0-1 ZrO 2 , and 1-3 F except for residual impurities and refining agents.
References Cited (Backward Citations)
US1900463A
Cited
US2660531A
Cited
US2877139A
Cited
US3005722A
Cited
US3320460A
Cited
US4081709A
Cited
US4315186A
Cited
US4224074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-25 | 1987-01-24 | 1987-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-25 | 1991-01-24 | 1991-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-25 | 1995-01-24 | 1995-07-26 | $7700.00 | Window Closed / Lapsed |