US3882345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal halide discharge lamp containing tin and sodium halides
Assignee: General Electric Co
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Filing: 1973-11-12
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Granted: 1975-05-06
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Expires: 1993-11-12
Abstract
Abstract A tin halide lamp containing stannous chloride SnCl2, stannous iodide SnI2, and mercury which are almost completely vaporized in operation, an excess of tin for thermodynamic stability, an inert starting gas, and a predetermined small quantity of sodium chloride, bromide, or iodide exceeding the quantity vaporized. The lamp exhibits a continuous spectrum on which the broadened sodium D-lines are superimposed. The D-lines shift the color coordinates to the black body locus and simultaneously increase the efficacy for a superior combination of color rendition and efficiency without any reduction in life.
Inventors
- 👤 Gregory J Kazek
- 👤 Dimitrios M Speros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:00
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
A HIGH INTENSITY DISCHARGING LAMP EXHIBITING A SUBSTANTIALLY CONTINUOUS SPECTRUM IN THE VISIBLE RANGE PLUS BROADENED SODIUM D LINE RADIATION COMPRISING A SEALED ELONGATED ARC TUBE OF LIGHT-TRANSMITTING MATERIAL, ARC SUPPORTING ELECTRODES MOUNTED AT OPPOSITE ENDS OF SAID ARC TUBE ON INLEADS SEALED THERETHROUGH, AND ADISCHARGE SUSTAINING FILLING WITHIN SAID ARC TUBE COMPRISING PER CUBIC CETIMETER OF ARC TUBE VOLUME FROM 0.15 TO 0.70 MILLIGRAMS OF SNCL2, FROM 0.60 TO 2.50 MILLIGRAMS OF SNL2, AT LEAST 0.1. MILLIGRAM OF TIN, FROM 2.0 TO 6.0 MG OF MERCURY, FROM 1.0X10-6 TO 2.0X10-5 MOLES OF ONE OF SODIUM CHLORIDE, SODIUM BROMIDE, SODIUM IODIDE AND MIXTURES THEREOF, AND A SMALL QUANTITY OF AN INSERT STARTING GAS
Claim 2
Dependent Claim
113 words
A HIGH INTENSITY DISCHARGING LAMP EXHIBITING A SUBSTANTIALLY CONTINUOUS SPECTRUM IN THE VISIBLE RANGE PLUS BROADENED SODIUM D LINE RADIATION COMPRISING A SEALED ELONGATED ARC TUBE OF LIGHT-TRANSMITTING MATERIAL, ARC SUPPORTING ELECTRODES MOUNTED AT OPPOSITE ENDS OF SAID ARC TUBE ON INLEADS SEALED THERETHROUGH, AND ADISCHARGE SUSTAINING FILLING WITHIN SAID ARC TUBE COMPRISING PER CUBIC CETIMETER OF ARC TUBE VOLUME FROM 0.15 TO 0.70 MILLIGRAMS OF SNCL2, FROM 0.60 TO 2.50 MILLIGRAMS OF SNL2, AT LEAST 0.1. MILLIGRAM OF TIN, FROM 2.0 TO 6.0 MG OF MERCURY, FROM 1.0X10-6 TO 2.0X10-5 MOLES OF ONE OF SODIUM CHLORIDE, SODIUM BROMIDE, SODIUM IODIDE AND MIXTURES THEREOF, AND A SMALL QUANTITY OF AN INSERT STARTING GAS
Claim 3
Dependent Claim
23 words
A lamp as in claim 1 wherein the weight ratio of Na to Sn present in halide form does not exceed about 0.1.
Claim 4
Dependent Claim
27 words
A lamp as in claim 1 wherein the weight ratio of Na to Sn present in halide form is in the range of about 0.07 to 0.09.
Claim 5
Dependent Claim
41 words
A lamp as in claim 1 wherein the weight ratio of Na to Sn present in halide form is in the range of about 0.07 to 0.09 and the weight ratio of SnCl2 to SnI2 is from about 0.3:1 to 0.4:1.
Claim 6
Dependent Claim
55 words
A lamp as in claim 1 wherein the weight ratio of Na to Sn present in halide form is in the range of about 0.07 to 0.09 and the quantity of sodium halide is selected to increase the x chromaticity coordinate and shift the color point of the lamp substantially to the black body locus.
Claim 7
Dependent Claim
68 words
A lamp as in claim 1 wherein the weight ratio of Na to Sn present in halide form is in the range of about 0.07 to 0.09, the weight ratio of SnCl2 to SnI2 is from about 0.3:1 to 0.4:1, and the quantity of sodium halide is selected to increase the x chromaticity coordinate and shift the color point of the lamp substantially to the black body locus.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |