CA2261380A1 - Mercury and lead free high pressure sodium lamp - Google Patents
Mercury and lead free high pressure sodium lamp Download PDFInfo
- Publication number
- CA2261380A1 CA2261380A1 CA002261380A CA2261380A CA2261380A1 CA 2261380 A1 CA2261380 A1 CA 2261380A1 CA 002261380 A CA002261380 A CA 002261380A CA 2261380 A CA2261380 A CA 2261380A CA 2261380 A1 CA2261380 A1 CA 2261380A1
- Authority
- CA
- Canada
- Prior art keywords
- lamp
- arc tube
- lead
- outer envelope
- free
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims abstract description 13
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 13
- 239000011734 sodium Substances 0.000 title claims abstract description 13
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title description 4
- 229910052753 mercury Inorganic materials 0.000 title description 4
- 239000011521 glass Substances 0.000 claims abstract description 8
- 238000003466 welding Methods 0.000 claims abstract description 4
- 229910052724 xenon Inorganic materials 0.000 claims abstract description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims abstract description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000005388 borosilicate glass Substances 0.000 claims description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 claims description 3
- 229910011255 B2O3 Inorganic materials 0.000 claims description 2
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims 1
- 229910052593 corundum Inorganic materials 0.000 claims 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 claims 1
- NOTVAPJNGZMVSD-UHFFFAOYSA-N potassium monoxide Inorganic materials [K]O[K] NOTVAPJNGZMVSD-UHFFFAOYSA-N 0.000 claims 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 229910052785 arsenic Inorganic materials 0.000 description 3
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 239000010955 niobium Substances 0.000 description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000005354 aluminosilicate glass Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
- H01J61/825—High-pressure sodium lamps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
- H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
- H01J5/62—Connection of wires protruding from the vessel to connectors carried by the separate part
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
- H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
- H01J61/22—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent vapour of an alkali metal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/302—Vessels; Containers characterised by the material of the vessel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/34—Double-wall vessels or containers
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
- Discharge Lamp (AREA)
Abstract
A long-life, environmentally disposable high pressure sodium lamp comprising:
an arc tube capable of withstanding internal wall temperatures of 1250 to 1300°C and having electrodes sealed therein and being designed for operation at a given wattage;
a discharge space within the arc tube and an arc generating and sustaining medium within the discharge space, the medium being mercury-free and containing sodium in an amount of about 0.02 mg to 0.06 mg/watt of designed operation, and xenon at a pressure of 100 to 200 Torr; mounting means supporting the arc tube within a glass outer envelope, the glass outer envelope being lead-free and arsenic-free; and an electrically conductive base closing the outer envelope and containing lead-in wires affixed to the electrodes, the lead-in wires being attached to the base by welding.
an arc tube capable of withstanding internal wall temperatures of 1250 to 1300°C and having electrodes sealed therein and being designed for operation at a given wattage;
a discharge space within the arc tube and an arc generating and sustaining medium within the discharge space, the medium being mercury-free and containing sodium in an amount of about 0.02 mg to 0.06 mg/watt of designed operation, and xenon at a pressure of 100 to 200 Torr; mounting means supporting the arc tube within a glass outer envelope, the glass outer envelope being lead-free and arsenic-free; and an electrically conductive base closing the outer envelope and containing lead-in wires affixed to the electrodes, the lead-in wires being attached to the base by welding.
Description
ATT'Y DOCKET NO.: 98-1-316 MERCURY AND LEAD FREE HIGH PRESSURE SODIUM LAMP
TECHNICAL FIELD
This invention relates to discharge lamps and more particularly to high pressure sodium lamps. Still more particularly, it relates to such lamps that are environmentally disposable.
BACKGROUND ART
Discharge lamps generally include a discharge chamber of quartz or alumina supported within an envelope of borosilicate or aluminosilicate glass. Disposal of these lamps at the end of life has been deemed an environmental hazard because the outer envelope glass includes lead and arsenic and the discharge chamber includes mercury.
Further, the electrically conductive base may have the in-leads for the lamp attached thereto by a lead-based solder. The lead, arsenic and mercury are presumed to be hazardous to animal and human health.
DISCLOSURE OF INVENTION
It is, therefore, an object of the invention to obviate the disadvantages of the prior art.
It is another object of the invention to provide an environmentally safe lamp that may be disposed of easily.
Yet another object of the invention is the enhancement of lamp disposal. -These objects are accomplished, in one aspect of the invention, by the provision of a long-life, environmentally disposable high pressure sodium lamp comprising: an arc tube capable of withstanding internal wall temperatures of 1250 to 1300°C and having electrodes sealed therein and being designed for operation at a given wattage;
a discharge space within the arc tube and an arc generating and sustaining medium within ATT'Y DOCKET NO.: 98-1-316 the discharge space, the medium being mercury-free and containing sodium in an amount of about 0.02 mg to 0.06 mg/watt of designed operation, and xenon at a pressure of 100 to 200 Torr; mounting means supporting the arc tube within a glass outer envelope, the glass outer envelope being lead-free and arsenic-free; and an electrically conductive base closing the outer envelope and containing lead-in wires affixed to the electrodes, the lead-in wires being attached to the base by welding.
Lamps so constructed may be safely and legally disposed of in conventional land fills.
l0 BRIEF DESCRIPTION OF THE DRAWINGS
The single figure illustrates a lamp embodying the invention.
BEST MODE FOR CARRYING OUT THE INVENTION
For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims taken in conjunction with the above-described drawings.
Referring now to the drawing with greater particularity, there is shown a high pressure sodium vapor lamp 100 having a vitreous outer envelope 6 with a standard mogul screw base 4 attached to the stem end which is shown lowermost in the figure. A
reentrant stem press 8 has a pair of relatively heavy lead-in conductors 10 and 12 extending through the stem 8 and having outer ends of conductors 10 and 12 connected to the screw shell 17 and eyelet 18 by welding, thus eliminating the need for lead-bearing solder.
The lamp 100 has an inner envelope or arc tube 14 centrally located within the outer envelope 6. The arc tube 14 is comprised of a length of light transmitting ceramic formed of polycrystalline alumina ceramic that is translucent. The arc tube 14 contains a charge of an arc generating and sustaining medium which is mercury-free and contains sodium in an amount of 0.02 to 0.06 mg/watt of designed lamp operation (for lamps of ATT'Y DOCKET NO.: 98-1-316 70 to 150 watt operation), and 100 to 200 Torr of xenon, preferably, 140 to 160 Torr.
The amount of sodium present is enough to operate the lamp in a saturated mode for the 24,000 hour life. The upper end of the arc tube 14 is closed by an alumina ceramic plug 20 through which a niobium in-lead 26 projects and which supports an upper electrode (not shown) within the arc tube 14. The lower end of arc tube 14 has a closure which comprises a ceramic plug 21 through which extends a thin-walled niobium tube 26. The niobium tube 26 serves as an in-lead for arc tube 14. The shank of the lower electrode (not shown) of arc tube 14 projects into tube 26 and may be locked in place by crimping the tube 26 about the lower electrode at location 25. The arc tube 14 has a tungsten wire 50 coiled thereabout. The wire 50 is connected to one of the electrodes by a thermal switch 52 and is placed between the electrodes where the lowest breakdown voltage is achieved. The thermal switch opens when the lamp is warm so as to minimize electric fields across the tube wall The arc tube 14 is of primary interest to the invention and has an arc chamber 40 defined by walls 42. The arc tube comprises magnesia in an amount of about 0.020 to 0.050 wgt. percent; zirconia in an amount of about 0.018 wgt. percent, and about 0.035 wgt.
percent yttria; balance alumina. Such an arc tube is capable of operating with internal wall temperatures of 1250 to 1300°C and is shown in U.S. Patent No.
TECHNICAL FIELD
This invention relates to discharge lamps and more particularly to high pressure sodium lamps. Still more particularly, it relates to such lamps that are environmentally disposable.
BACKGROUND ART
Discharge lamps generally include a discharge chamber of quartz or alumina supported within an envelope of borosilicate or aluminosilicate glass. Disposal of these lamps at the end of life has been deemed an environmental hazard because the outer envelope glass includes lead and arsenic and the discharge chamber includes mercury.
Further, the electrically conductive base may have the in-leads for the lamp attached thereto by a lead-based solder. The lead, arsenic and mercury are presumed to be hazardous to animal and human health.
DISCLOSURE OF INVENTION
It is, therefore, an object of the invention to obviate the disadvantages of the prior art.
It is another object of the invention to provide an environmentally safe lamp that may be disposed of easily.
Yet another object of the invention is the enhancement of lamp disposal. -These objects are accomplished, in one aspect of the invention, by the provision of a long-life, environmentally disposable high pressure sodium lamp comprising: an arc tube capable of withstanding internal wall temperatures of 1250 to 1300°C and having electrodes sealed therein and being designed for operation at a given wattage;
a discharge space within the arc tube and an arc generating and sustaining medium within ATT'Y DOCKET NO.: 98-1-316 the discharge space, the medium being mercury-free and containing sodium in an amount of about 0.02 mg to 0.06 mg/watt of designed operation, and xenon at a pressure of 100 to 200 Torr; mounting means supporting the arc tube within a glass outer envelope, the glass outer envelope being lead-free and arsenic-free; and an electrically conductive base closing the outer envelope and containing lead-in wires affixed to the electrodes, the lead-in wires being attached to the base by welding.
Lamps so constructed may be safely and legally disposed of in conventional land fills.
l0 BRIEF DESCRIPTION OF THE DRAWINGS
The single figure illustrates a lamp embodying the invention.
BEST MODE FOR CARRYING OUT THE INVENTION
For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims taken in conjunction with the above-described drawings.
Referring now to the drawing with greater particularity, there is shown a high pressure sodium vapor lamp 100 having a vitreous outer envelope 6 with a standard mogul screw base 4 attached to the stem end which is shown lowermost in the figure. A
reentrant stem press 8 has a pair of relatively heavy lead-in conductors 10 and 12 extending through the stem 8 and having outer ends of conductors 10 and 12 connected to the screw shell 17 and eyelet 18 by welding, thus eliminating the need for lead-bearing solder.
The lamp 100 has an inner envelope or arc tube 14 centrally located within the outer envelope 6. The arc tube 14 is comprised of a length of light transmitting ceramic formed of polycrystalline alumina ceramic that is translucent. The arc tube 14 contains a charge of an arc generating and sustaining medium which is mercury-free and contains sodium in an amount of 0.02 to 0.06 mg/watt of designed lamp operation (for lamps of ATT'Y DOCKET NO.: 98-1-316 70 to 150 watt operation), and 100 to 200 Torr of xenon, preferably, 140 to 160 Torr.
The amount of sodium present is enough to operate the lamp in a saturated mode for the 24,000 hour life. The upper end of the arc tube 14 is closed by an alumina ceramic plug 20 through which a niobium in-lead 26 projects and which supports an upper electrode (not shown) within the arc tube 14. The lower end of arc tube 14 has a closure which comprises a ceramic plug 21 through which extends a thin-walled niobium tube 26. The niobium tube 26 serves as an in-lead for arc tube 14. The shank of the lower electrode (not shown) of arc tube 14 projects into tube 26 and may be locked in place by crimping the tube 26 about the lower electrode at location 25. The arc tube 14 has a tungsten wire 50 coiled thereabout. The wire 50 is connected to one of the electrodes by a thermal switch 52 and is placed between the electrodes where the lowest breakdown voltage is achieved. The thermal switch opens when the lamp is warm so as to minimize electric fields across the tube wall The arc tube 14 is of primary interest to the invention and has an arc chamber 40 defined by walls 42. The arc tube comprises magnesia in an amount of about 0.020 to 0.050 wgt. percent; zirconia in an amount of about 0.018 wgt. percent, and about 0.035 wgt.
percent yttria; balance alumina. Such an arc tube is capable of operating with internal wall temperatures of 1250 to 1300°C and is shown in U.S. Patent No.
5,682,082, which is assigned to the assignee of the instant invention.
The outer envelope 6 is lead-free and arsenic-free and preferably is a borosilicate glass having a composition of 13.5 to 16.8 wt. % B203, 2.0 to 4.0 wt % A1203, 2.0 to 5 wt.
Na20, 1.3 to 4.0 wt. % K20, from 0 to 0.30 wt. % Li20, 0 to 1.0 wt. % CaO, 0 to 1.0 wt.
% MgO, 0.05 to 0.17 wt. % Fe203, 0.005 to 0.06 wt. % Ce02, and the balance Si02.
Preferably, the amounts of Fe203 and Ce02 comprise no greater than 0.19 wt. %
and the sum of the amounts of Na20, K20 and Li02 comprise no greater that 7.5 wt. %.
Such a glass is shown, for example in S.N. 09/085,989, filed 05/28/98 and assigned to the assignee of the present invention.
There is thus provided and environmentally safe, easily disposable discharge lamp that is free of lead, including lead solder, and mercury and arsenic. The lamp has a 24,000 hour life.
ATT'Y DOCKET NO.: 98-1-316 While there have been shown and described what are at present considered the preferred embodiments of the invention, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the scope of the invention as defined by the appended claims.
The outer envelope 6 is lead-free and arsenic-free and preferably is a borosilicate glass having a composition of 13.5 to 16.8 wt. % B203, 2.0 to 4.0 wt % A1203, 2.0 to 5 wt.
Na20, 1.3 to 4.0 wt. % K20, from 0 to 0.30 wt. % Li20, 0 to 1.0 wt. % CaO, 0 to 1.0 wt.
% MgO, 0.05 to 0.17 wt. % Fe203, 0.005 to 0.06 wt. % Ce02, and the balance Si02.
Preferably, the amounts of Fe203 and Ce02 comprise no greater than 0.19 wt. %
and the sum of the amounts of Na20, K20 and Li02 comprise no greater that 7.5 wt. %.
Such a glass is shown, for example in S.N. 09/085,989, filed 05/28/98 and assigned to the assignee of the present invention.
There is thus provided and environmentally safe, easily disposable discharge lamp that is free of lead, including lead solder, and mercury and arsenic. The lamp has a 24,000 hour life.
ATT'Y DOCKET NO.: 98-1-316 While there have been shown and described what are at present considered the preferred embodiments of the invention, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the scope of the invention as defined by the appended claims.
Claims (6)
1. A long-life, environmentally disposable high pressure sodium lamp comprising:
an arc tube capable of withstanding internal wall temperatures of 1250 to 1300°C and having electrodes sealed therein and being designed for operation at a given wattage; a discharge space within said arc tube and an arc generating and sustaining medium within said discharge space, said medium being mercury-free and containing sodium in an amount of about 0.02 mg to 0.06 mg/watt of designed operation, and xenon at a pressure of 100 to 200 Torr; mounting means supporting said arc tube within a glass outer envelope, said glass outer envelope being lead-free and arsenic-free;
and an electrically conductive base closing said outer envelope and containing lead-in wires affixed to said electrodes, said lead-in wires being attached to said base by welding.
an arc tube capable of withstanding internal wall temperatures of 1250 to 1300°C and having electrodes sealed therein and being designed for operation at a given wattage; a discharge space within said arc tube and an arc generating and sustaining medium within said discharge space, said medium being mercury-free and containing sodium in an amount of about 0.02 mg to 0.06 mg/watt of designed operation, and xenon at a pressure of 100 to 200 Torr; mounting means supporting said arc tube within a glass outer envelope, said glass outer envelope being lead-free and arsenic-free;
and an electrically conductive base closing said outer envelope and containing lead-in wires affixed to said electrodes, said lead-in wires being attached to said base by welding.
2. The lamp of Claim 1 wherein said sodium amount is sufficient to cause said lap to operate in a saturated mode for at least 24,000 hours.
3. The lamp of Claim 1 wherein said arc tube is formed from polycrystalline alumina containing minor amounts of MgO, ZrO2, and Y2O3.
4. The lamp of Claim 3 wherein said minor amounts are about 0.02 wt. % MgO;
0.018 wt. % ZrO2; and 0.035 wt. % Y2O3.
0.018 wt. % ZrO2; and 0.035 wt. % Y2O3.
5. The lamp of Claim 1 wherein said outer envelope is a borosilicate glass.
6. The lamp of Claim 5 wherein said borosilicate glass has a composition consisting essentially of: B2O3, Al2O3, Fe2O3, Na2O, K2O, CeO2, and SiO2, with optional minor amounts of Li2O, CaO, and MgO, said minor amount totaling less that 2.5 wt. %.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7769898P | 1998-03-12 | 1998-03-12 | |
| US60/077,698 | 1998-03-12 | ||
| US09/244,252 | 1999-02-03 | ||
| US09/244,252 US6268696B1 (en) | 1999-02-03 | 1999-02-03 | Mercury and lead free high pressure sodium lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2261380A1 true CA2261380A1 (en) | 1999-09-12 |
Family
ID=26759571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002261380A Abandoned CA2261380A1 (en) | 1998-03-12 | 1999-02-08 | Mercury and lead free high pressure sodium lamp |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0942456B1 (en) |
| JP (1) | JPH11288692A (en) |
| CA (1) | CA2261380A1 (en) |
| DE (1) | DE69919056T2 (en) |
| HU (1) | HU222332B1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07272680A (en) * | 1994-03-31 | 1995-10-20 | Toshiba Lighting & Technol Corp | Ceramic discharge lamp, lamp lighting device, and illumination fixture |
| US5814944A (en) * | 1996-01-22 | 1998-09-29 | Matsushita Electric Works, Ltd. | High pressure sodium vapor lamp with high color rendering |
| US5682082A (en) | 1996-07-29 | 1997-10-28 | Osram Sylvania Inc. | Translucent polycrystalline alumina and method of making same |
| US6118216A (en) * | 1997-06-02 | 2000-09-12 | Osram Sylvania Inc. | Lead and arsenic free borosilicate glass and lamp containing same |
| WO2013144676A1 (en) | 2012-03-26 | 2013-10-03 | Volacom Ad | Animal collision avoidance system |
-
1999
- 1999-02-08 CA CA002261380A patent/CA2261380A1/en not_active Abandoned
- 1999-02-27 EP EP99103825A patent/EP0942456B1/en not_active Expired - Lifetime
- 1999-02-27 DE DE69919056T patent/DE69919056T2/en not_active Expired - Lifetime
- 1999-03-09 HU HU9900559A patent/HU222332B1/en not_active IP Right Cessation
- 1999-03-11 JP JP11064920A patent/JPH11288692A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0942456A3 (en) | 1999-09-29 |
| DE69919056T2 (en) | 2004-12-30 |
| HU9900559D0 (en) | 1999-05-28 |
| EP0942456B1 (en) | 2004-08-04 |
| JPH11288692A (en) | 1999-10-19 |
| HUP9900559A2 (en) | 1999-10-28 |
| HU222332B1 (en) | 2003-06-28 |
| EP0942456A2 (en) | 1999-09-15 |
| DE69919056D1 (en) | 2004-09-09 |
| HUP9900559A3 (en) | 2001-04-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |