US3670193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamps producing energy in the visible and ultra-violet ranges
Assignee: Duro Test Corp
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Filing: 1970-05-14
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Granted: 1972-06-13
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Expires: 1990-05-14
Abstract
Abstract Electric lamps having spectral radiation characteristics approximating natural daylight with a controlled amount of energy in the near and middle ultraviolet ranges which also produce light of sufficient intensity and proper color to make them usable as general illuminants.
Inventors
- 👤 Luke Thorington
- 👤 Louis J Parascandola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:50
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/08; C09K11/0838; C09K11/66; C09K11/67; C09K11/68; C09K11/70; C09K11/71
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
200 words
An electric lamp for general illumination purposes operable from a source of voltage comprising an envelope capable of transmitting light in the visible, and middle and near ultraviolet ranges, a pair of electrodes for connection to said voltage source and an ionizable medium within said envelope, said electrodes and said ionizable medium upon operation of the lamp producing an electrical discharge, means cooperating with the radiant power of the electrical discharge for producing radiation having a spectrum in the visible light range with a C.I.E. color rendering index of at least 80, radiation in the near ultraviolet range, and radiation in the middle ultraviolet range, said visible and said ultraviolet radiation produced being transmitted through said envelope in the quantities of between about 6-50 microwatts of middle range ultraviolet radiation and between about 150-700 microwatts of near range ultraviolet radiation per lumen of visible light with the radiant power ratio of near ultraviolet/middle ultraviolet radiation being in the range from between about 8 to 40, said ultraviolet radiation transmitted through said envelope being of a total quantity substantially the same per lumen of visible light transmitted through said envelope as found in natural daylight of the same correlated color temperature.
Claim 2
Dependent Claim
200 words
An electric lamp for general illumination purposes operable from a source of voltage comprising an envelope capable of transmitting light in the visible, and middle and near ultraviolet ranges, a pair of electrodes for connection to said voltage source and an ionizable medium within said envelope, said electrodes and said ionizable medium upon operation of the lamp producing an electrical discharge, means cooperating with the radiant power of the electrical discharge for producing radiation having a spectrum in the visible light range with a C.I.E. color rendering index of at least 80, radiation in the near ultraviolet range, and radiation in the middle ultraviolet range, said visible and said ultraviolet radiation produced being transmitted through said envelope in the quantities of between about 6-50 microwatts of middle range ultraviolet radiation and between about 150-700 microwatts of near range ultraviolet radiation per lumen of visible light with the radiant power ratio of near ultraviolet/middle ultraviolet radiation being in the range from between about 8 to 40, said ultraviolet radiation transmitted through said envelope being of a total quantity substantially the same per lumen of visible light transmitted through said envelope as found in natural daylight of the same correlated color temperature.
Claim 3
Dependent Claim
63 words
An electric lamp as in claim 1 wherein said means cooperating with the radiant power of the electrical discharge produces respective quantities of radiation transmitted through said envelope in each of said middle and near ultraviolet ranges per lumen of visible light which are substantially the same as that found in the corresponding ranges of natural daylight for the same correlated color temperature.
Claim 4
Dependent Claim
63 words
An electric lamp as in claim 1 wherein said means cooperating with the radiant power of the electrical discharge produces ultraviolet radiation transmitted through said envelope in the middle ultraviolet range which is of a quantity less than that which would produce minimum perceptible erythema on an average untanned caucasian skin during exposure for an eight-hour period at a 100 foot candle level.
Claim 5
Dependent Claim
24 words
An electric lamp as in claim 1 wherein said envelope is of a material which substantially blocks the transmission of radiation below 290 nanometers.
Claim 6
Dependent Claim
200 words
A fluorescent lamp for general illumination purposes operable from a source of voltage comprising an ultraviolet and visible light transmitting envelope, a pair of electrodes for connection to said voltage source, an inert gas and an ionizable medium within said envelope for producing an electrical discharge upon operation of the lamp, means including a blend of phosphors internally coated on said envelope for producing upon operation of the lamp and in cooperation with the radiant power of the electrical discharge radiation which is transmitted through said envelope including visible light having a C.I.E. color rendering index of at least 80, and an ultraviolet emission of radiation in both the near and the middle ultraviolet ranges which is transmitted through said envelope in the quantities of between about 6-50 microwatts of middle range ultraviolet radiation and between about 150-700 microwatts of near range ultraviolet radiation per lumen of visible light with the radiant power ratio of near ultraviolet/middle ultraviolet radiation being in the range from between about 8 to 40 and the quantity of total ultraviolet radiation being substantially the same per lumen of visible light transmitted through the envelope as found in natural daylight of the same correlated color temperature.
Claim 7
Dependent Claim
200 words
A fluorescent lamp for general illumination purposes operable from a source of voltage comprising an ultraviolet and visible light transmitting envelope, a pair of electrodes for connection to said voltage source, an inert gas and an ionizable medium within said envelope for producing an electrical discharge upon operation of the lamp, means including a blend of phosphors internally coated on said envelope for producing upon operation of the lamp and in cooperation with the radiant power of the electrical discharge radiation which is transmitted through said envelope including visible light having a C.I.E. color rendering index of at least 80, and an ultraviolet emission of radiation in both the near and the middle ultraviolet ranges which is transmitted through said envelope in the quantities of between about 6-50 microwatts of middle range ultraviolet radiation and between about 150-700 microwatts of near range ultraviolet radiation per lumen of visible light with the radiant power ratio of near ultraviolet/middle ultraviolet radiation being in the range from between about 8 to 40 and the quantity of total ultraviolet radiation being substantially the same per lumen of visible light transmitted through the envelope as found in natural daylight of the same correlated color temperature.
Claim 8
Dependent Claim
60 words
A fluorescent lamp as in claim 5 wherein said means including the blend of phosphors which cooperates with the electrical discharge produces respective quantities of radiation transmitted through said envelope in each of said middle and near ultraviolet ranges which are substantially the same as that found in the corresponding ranges of natural daylight for the same correlated color temperature.
Claim 9
Dependent Claim
33 words
A fluorescent lamp as set forth in claim 5 wherein the envelope is of a material which limits the transmittance of the short wavelengths of ultraviolet radiation produced substantially to above 290 nanometers.
Claim 10
Dependent Claim
28 words
A fluorescent lamp as set forth in claim 5 wherein the phosphor blend comprises at least the following phosphors: Strontium Calcium Orthophosphate:Tin Magnesium Tungstate Barium Silicate:Lead Zinc Silicate:Manganese.
Claim 11
Dependent Claim
59 words
A fluorescent lamp as set forth in claim 8 wherein the phosphor blend comprises at least the following phosphors at substantially the weight percentages of the total blend indicated: Strontium Calcium Orthophosphate:Tin68.3 Magnesium Tungstate22.2 Barium Silicate:Lead5.0 Zinc Silicate:Manganese4.5 to produce a lamp having a color rendering index of visible light of about 91 at about 5500* K color temperature.
Claim 12
Dependent Claim
35 words
A fluorescent lamp as set forth in claim 5 wherein the phosphor blend comprises at least the following phosphors: Strontium Calcium Orthophosphate:Tin Magnesium Tungstate Calcium Tungstate Magnesium Fluorogermanate Yttrium Vanadate:Europium Barium Silicate:Lead Calcium Zinc Phosphate:Thallium
Claim 13
Dependent Claim
66 words
A fluorescent lamp as set forth in claim 8 wherein the phosphor blend comprises at least the following phosphors at substantially the weight percentages of the total blend indicated: Strontium Calcium Orthophosphate:Tin44.7 Magnesium Tungstate20.8 Calcium Tungstate13.7 Magnesium Fluorogermanate6.8 Yttrium Vanadate:Europium3.3 Barium Silicate:Lead9.0 Calcium Zinc Phosphate:Thallium2.0 to produce a lamp having a color rendering index of visible light of about 96 at about 7500* K color temperature.
Claim 14
Dependent Claim
25 words
A fluorescent lamp as in claim 5 wherein the visible light produced has a color temperature of between about 5000* K and about 8000* K.
Claim 15
Dependent Claim
48 words
A fluorescent lamp as in claim 5 wherein said means including said blend of phosphors for cooperating with said electrical discharge produces light in the visible range with a ratio of the yellow to red components thereof being substantially less than 10:1 at about 5500* K color temperature.
Claim 16
Dependent Claim
48 words
A fluorescent lamp as in claim 5 wherein said means including said blend of phosphors for cooperating with said electrical discharge produces light in the visible range with a ratio of the yellow to red components thereof being substantially less than 7:1 at about 7500* K color temperature.
Claim 17
Dependent Claim
26 words
The fluorescent lamp as in claim 5 wherein said means including said blend of phosphors which cooperates with the electrical discharge produces substantially no infra-red radiation.
Claim 18
Dependent Claim
22 words
A fluorescent lamp as in claim 5 wherein the phosphor blend is substantially uniformly distributed on the internal surface of the envelope.
Claim 19
Dependent Claim
33 words
A fluorescent lamp as in claim 5 wherein said means including said blend of phosphors which cooperates with the electrical discharge produces light having a C.I.E. color rendering index of at least 85.
References Cited (Backward Citations)
US2563900A
Cited
US3355982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |