CA2091470A1 - Method and apparatus for introducing mercury into arc discharge lamps - Google Patents
Method and apparatus for introducing mercury into arc discharge lampsInfo
- Publication number
- CA2091470A1 CA2091470A1 CA 2091470 CA2091470A CA2091470A1 CA 2091470 A1 CA2091470 A1 CA 2091470A1 CA 2091470 CA2091470 CA 2091470 CA 2091470 A CA2091470 A CA 2091470A CA 2091470 A1 CA2091470 A1 CA 2091470A1
- Authority
- CA
- Canada
- Prior art keywords
- mercury
- lamp
- ceramic
- sphere
- article
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
- H01J61/28—Means for producing, introducing, or replenishing gas or vapour during operation of the lamp
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/38—Exhausting, degassing, filling, or cleaning vessels
- H01J9/395—Filling vessels
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
METHOD AND APPARATUS FOR INTRODUCING
MERCURY INTO ARC DISCHARGE LAMPS
ABSTRACT OF THE DISCLOSURE
An alumina sphere having a porous wall structure and a cavity within is employed to introduce mercury into an arc discharge lamp, such as a fluorescent lamp. Mercury is introduced into the ceramic sphere by subjecting the sphere to reduced pressure, surrounding it with liquid mercury and increasing the pressure to force the mercury inside.
The mercury-containing sphere is then introduced into the exhaust tube of the lamp before it is sealed.
Heat or a combination of heat and reduced pressure is used to drive the mercury out of the sphere and into the interior of the lamp.
MERCURY INTO ARC DISCHARGE LAMPS
ABSTRACT OF THE DISCLOSURE
An alumina sphere having a porous wall structure and a cavity within is employed to introduce mercury into an arc discharge lamp, such as a fluorescent lamp. Mercury is introduced into the ceramic sphere by subjecting the sphere to reduced pressure, surrounding it with liquid mercury and increasing the pressure to force the mercury inside.
The mercury-containing sphere is then introduced into the exhaust tube of the lamp before it is sealed.
Heat or a combination of heat and reduced pressure is used to drive the mercury out of the sphere and into the interior of the lamp.
Description
2091~70 METHOD AND APPARATUS FOR INTRODUCING
MERCURY INTO ARC DISC~ARGE LAMPS
BACRGROUND OF THE INyENTION
Field of the Invention This invention relates to a method and apparatus for dosing liquids. More particularly, this invention relate~ to a process for introducing mercury into a porous, hollow ceramic article, followed by introducing the mercury-containing article into an arc discharge lamp, such as a fluorescent lamp, and then discharging the mercury from the article inside the lamp and to a lamp containing the mercury and the article.
Backg~Qund of the DisçlQ~
Most electric arc discharge lamps employ mercury as at least one of th~ ionizable components required to initiate or sustain th~ arc discharge and it i~ therefore necessary to introduce the proper amount of m~rcury into the lamp during the manufacturing process. The lamp industry is constantly looking for ways to introduce mercury into such lamps in a facile, inexpensive and reproducible manner. In the past, various machines and devices have been employed to introduce the mercury into the lamp in a liquid form; as an amalgam; in the interstice~ of a s~ntered metal or composite, and in mercury-containing metal or glass capsules which must be ruptured after lamp manufacture in order to release the mercury.
2o9l~7~
SUMMAR~ OF THE INVENTION
It has now been discovered that a porous, hollow ceramic article, such as a sphere having porous walls, can be filled with a liquid such as mercury, the mercury-containing article then introduced into a lamp and the mercury discharged out of the ceramic article inside the lamp. The liquid or mercury is introduced into the porous, hollow ceramic article by placing the article in a subatmospheric environment to reduce the pressure inside the hollow portion or cavity of the article and then introducing the desired liquid or mercury into the reduced pressure cavity through the porous wall. The mercury-containing ceramic article is then introduced into a lamp and the mercury discharged out of the article inside the lamp by reducing the pressure in the lamp, heating the lamp and/or the article or a combination of heat and reduced pres~ure. This invention has been found to be part$cularly useful in dosing m2rcury into low pressure arc discharge lamps such as the well known fluorescent lamps.
BRIEF DES~RIp~lON OF THE DRAWINGS
Figure 1 schematically illustrates a porous, hollow ceramic microsphere made of alumina useful in the practice of the invention.
Figure 2(a) is a partial sectional view of a fluorescent lamp assembly having a porous, hollow mercury-containing ceramic sphere lodged inside the mount stem at one end of the lamp prior to sealing the exhaust tube and Figure 2(b) illustrates the lamp after sealing the exhaust tube and complsting the lamp.
MERCURY INTO ARC DISC~ARGE LAMPS
BACRGROUND OF THE INyENTION
Field of the Invention This invention relates to a method and apparatus for dosing liquids. More particularly, this invention relate~ to a process for introducing mercury into a porous, hollow ceramic article, followed by introducing the mercury-containing article into an arc discharge lamp, such as a fluorescent lamp, and then discharging the mercury from the article inside the lamp and to a lamp containing the mercury and the article.
Backg~Qund of the DisçlQ~
Most electric arc discharge lamps employ mercury as at least one of th~ ionizable components required to initiate or sustain th~ arc discharge and it i~ therefore necessary to introduce the proper amount of m~rcury into the lamp during the manufacturing process. The lamp industry is constantly looking for ways to introduce mercury into such lamps in a facile, inexpensive and reproducible manner. In the past, various machines and devices have been employed to introduce the mercury into the lamp in a liquid form; as an amalgam; in the interstice~ of a s~ntered metal or composite, and in mercury-containing metal or glass capsules which must be ruptured after lamp manufacture in order to release the mercury.
2o9l~7~
SUMMAR~ OF THE INVENTION
It has now been discovered that a porous, hollow ceramic article, such as a sphere having porous walls, can be filled with a liquid such as mercury, the mercury-containing article then introduced into a lamp and the mercury discharged out of the ceramic article inside the lamp. The liquid or mercury is introduced into the porous, hollow ceramic article by placing the article in a subatmospheric environment to reduce the pressure inside the hollow portion or cavity of the article and then introducing the desired liquid or mercury into the reduced pressure cavity through the porous wall. The mercury-containing ceramic article is then introduced into a lamp and the mercury discharged out of the article inside the lamp by reducing the pressure in the lamp, heating the lamp and/or the article or a combination of heat and reduced pres~ure. This invention has been found to be part$cularly useful in dosing m2rcury into low pressure arc discharge lamps such as the well known fluorescent lamps.
BRIEF DES~RIp~lON OF THE DRAWINGS
Figure 1 schematically illustrates a porous, hollow ceramic microsphere made of alumina useful in the practice of the invention.
Figure 2(a) is a partial sectional view of a fluorescent lamp assembly having a porous, hollow mercury-containing ceramic sphere lodged inside the mount stem at one end of the lamp prior to sealing the exhaust tube and Figure 2(b) illustrates the lamp after sealing the exhaust tube and complsting the lamp.
2~147~
Referring to Figure 1, a cross section of a porous, hollow ceramic sphere useful in the practice of the invention is shown in schematic form. Thus, hollow sphere 10 is shown as comprising cavity 12 surrounded by outer wall 14. Wall 14 is sufficiently porous to allow mercury to be introduced into the interior hollow portion or inner cavity 12 of the sphere under the proper conditions. Hollow ceramic spheres having porous walls useful in the practice of the invention may be obtained from Microcel Technology, Inc., of Edison, New Jersey. These are hollow, thin-shell spheres having strength, low density and extreme resistance to thermal shock and have been made of more than twenty different ceramics including alumina, zirconia, mullite and kaolin They ar~ available in sizes ranging from 1 to 7 mm in diameter with wall thicknesses of from 12-150 microns. Although these hollow, porous microspheres are made primarily for low mass kiln furniture, radiant burners, high-temperature low-bearing insulation and filters for molten metal, they have be~n found useful in the practice of the present invention.
These hollow ceramic spheres have been filled with mercury by first placing the spheres in a vacuum chamber and subjecting the spheres to vacuum or subatmospheric pressure in order to insure the desired vacuum throughout the hollow pore structure of the wall and inside the hollow cavity 12 of the spheres. After the desired vacuum or subatmospheric pressure has been reached inside the cavity, the spheres are surrounded by liquid mercury either by placing them in a pool of l~quid mercury within the vacuum chamber or introducing liquid mercury into the 2~91~70 vacuum chamber until it completely surrounds and covers all the spheres, after which time the ambient surrounding the sphere-containing pool of mercury is increased to the desired pressure. Hollow microspheres made of alumina have been filled with mercury by placing the spheres in a vacuum cha~ber and reducing the pressure to a vacuum, introducing mercury into the chamber to form a pool of liquid mercury containing the spheres and then increasing the pressure over the mercury to a value ranging from atmospheric to, i.e., 200 psi. This causes the liquid mercury to penetrate through the porous walls 14 of the spheres 10 into the cavity 12. The rate of penetration of the mercury into the interior hollow cavity 12 of a sphere is dependent upon the pressure differential across the porsus wall, the porosity and the temperature, it being well known and understood to those skilled in th~ art that increased temperature, porosity and pres~ure will increase the rate of penetration of mercury into the hollow sphere portion 12. On the other hand, if the porosity is too great mercury loss or leakage during storage or the lamp manufacturing process will be a problem. If the porosity is too little, release of the mercury from the sphere into the lamp may take too lonq.
After the mercury ha~ penetrated and filled the hollow interior cavity 12 of the microspheres in the mercury pool, the mercury is drained from the pool, or the spheres removed from the pool, and the mercury-filled spheres placed in storage under suitable conditions until they are used in the lamp making process. Storage of the mercury filled microspheres is done without the need for any special precautions or handling. The vapor pressure of - 35 mercury is sufficiently low at ambient conditions and 20919L7~
its surface tension sufficiently high to prevent the mercury from leaking or vaporizing out through the porous wall of the spheres. The amount of mercury that a hollow ceramic sphere according to the invention can contain is, of course, dependent on the size of the sphere and the cavity contained within.
For example, a 3 mm diamet~r alumina sphere having a 0.1 mm wall thickness will hold about 80 mg of morcury and a 1.5 mm diameter sphere of the same wall thickness will hold about 20 mg of mercury.
Turninq to Figure 2(a) there is shown, in schematic form, a partial section of one end of a fluorescent lamp construction prior to being sealed.
Thus, fluorescent lamp preassembly 20 comprises glass envelope 22 having a coating of on~ or more phosphors - 24 on the interior surface thereof and enclosing c~vity 26. Filament mount structure 28 is shown at one end of lamp 20 a~ comprising gla~s mount stem 30 which terminates at one end in flare portion 36 fused to ~nv-lop~ 22 at 38. Mount stem 30 contains a pair of electrically conductive lead~ 34 hermetically sealQd within and extending therethrough to one end of each o~ which is attached electrode 32 inside the lamp and the other end extends exterior of the lamp ~or subsequent connection to electrically conductive pins 54. The interior of electrode mount structure ~8 contains exhaust tube 40 which terminates inside the mount stem at exhaust hole 42. Prior to final se~ling the lamp, the assembly 20 is heated to about 300-C, exhausted, filled with argon at a pressure of about 2 torr and exhaust tube 40 is then tipped-off by heating to seal the lamp. The low pressure in the lamp assists in collapsing the exhaust tube and sealing it at the poin~ where it is heated by a torch (not shown) to achieve sealing and removal of the excess portion of the exhaust tube after sealing.
Heating the lamp assembly prior to exhausting or to applying a vacuum to the interior of the lamp envelope aids in outgassing the interior of the lamp. A mercury-containing ceramic sphere 10 is inserted into the lamp exhaust tube 40. In one embodiment the sphere passes through exhaust hole 42 and into interior cavity 26 wherein the mercury is released into the lamp due to the combination of heat and reduced pressure in the lamp. In another embodiment hole 42 is sufficiently small compared to the diameter of the sphere so as not to permit sphere 10 to pass therethrough into the interior cavity 26 of lamp envelope 22. The lamp assembly 20 is then exhausted through tube 40 and a suitable inert gas, such as argon at a pres~ure of about 4 torr, is fillad into the lamp through exhaust tube 40 and hole 42 either be~ore of after the mercury-containing sphere 10 i5 inserted into the exhaust tube, after which tube 40 i~ soaled as shown in Figure 2(b) containing ceramic sphere 10 enclosed either within it inside the interior of mount stem 30 or in the interior cavity 26 of the lamp. It is preferred to reta~n sphere 10 in the sealed and tipped-off remainder of the exhaust tub~ 40 within mount stem 30 BO th~t the sphere cannot abrade or scratch the phosphor coating 24 in the lamp. After the sealed lamp assembly 20 has cooled, end caps 52 and electrical connection pins 54 are assembled onto the lamp structure to produce the completed fluorescent lamp 50.
A number of 40 watt fluorescent lamps having a coating of a calcium halophosphate phosphor 24 disposed on the inside surface of lamp envelope 22 were made in four foot lengths, being typical F40T12 2 ~ 7 0 cool white fluorescent lamps common in both the home and in industry. About ten lamps were made wherein the mercury-containing ceramic sphere was introduced into the interior cavity 26 of the lamp through the exhaust tube 40 and exhaust hole 42. The sphere was 3 mm in diameter, contained 80 mg of mercury and was introduced into the lamp when the lamp had cooled to about 200-C, after which 4 torr of argon was introduced into the lamp and the exhaust tube tipped-off and sealed. Another batch of ten were prepared in a similar manner, but using a 1.5 mm diameter ceramic sphere 10 conta~ning about 20 mg of mercury which was introduced into the lamp cavity 26 after exhaustion and back filling with 4 torr of argon. The lamp was at a temperature of 200-C. ~oth batches of lamps were assembled with end caps and pins. These lamps wers all energized and started immediately and found to be operating satisfactorily with no 108~ in maintenance or performance after a p-riod of 6000 hours, at which time the lamps were turned off and the te~t was completed. This thus demonstrates a reduction to practice of the invention and the fact that the practice of the invention produces satisfactory fluore~cent lamps.
Referring to Figure 1, a cross section of a porous, hollow ceramic sphere useful in the practice of the invention is shown in schematic form. Thus, hollow sphere 10 is shown as comprising cavity 12 surrounded by outer wall 14. Wall 14 is sufficiently porous to allow mercury to be introduced into the interior hollow portion or inner cavity 12 of the sphere under the proper conditions. Hollow ceramic spheres having porous walls useful in the practice of the invention may be obtained from Microcel Technology, Inc., of Edison, New Jersey. These are hollow, thin-shell spheres having strength, low density and extreme resistance to thermal shock and have been made of more than twenty different ceramics including alumina, zirconia, mullite and kaolin They ar~ available in sizes ranging from 1 to 7 mm in diameter with wall thicknesses of from 12-150 microns. Although these hollow, porous microspheres are made primarily for low mass kiln furniture, radiant burners, high-temperature low-bearing insulation and filters for molten metal, they have be~n found useful in the practice of the present invention.
These hollow ceramic spheres have been filled with mercury by first placing the spheres in a vacuum chamber and subjecting the spheres to vacuum or subatmospheric pressure in order to insure the desired vacuum throughout the hollow pore structure of the wall and inside the hollow cavity 12 of the spheres. After the desired vacuum or subatmospheric pressure has been reached inside the cavity, the spheres are surrounded by liquid mercury either by placing them in a pool of l~quid mercury within the vacuum chamber or introducing liquid mercury into the 2~91~70 vacuum chamber until it completely surrounds and covers all the spheres, after which time the ambient surrounding the sphere-containing pool of mercury is increased to the desired pressure. Hollow microspheres made of alumina have been filled with mercury by placing the spheres in a vacuum cha~ber and reducing the pressure to a vacuum, introducing mercury into the chamber to form a pool of liquid mercury containing the spheres and then increasing the pressure over the mercury to a value ranging from atmospheric to, i.e., 200 psi. This causes the liquid mercury to penetrate through the porous walls 14 of the spheres 10 into the cavity 12. The rate of penetration of the mercury into the interior hollow cavity 12 of a sphere is dependent upon the pressure differential across the porsus wall, the porosity and the temperature, it being well known and understood to those skilled in th~ art that increased temperature, porosity and pres~ure will increase the rate of penetration of mercury into the hollow sphere portion 12. On the other hand, if the porosity is too great mercury loss or leakage during storage or the lamp manufacturing process will be a problem. If the porosity is too little, release of the mercury from the sphere into the lamp may take too lonq.
After the mercury ha~ penetrated and filled the hollow interior cavity 12 of the microspheres in the mercury pool, the mercury is drained from the pool, or the spheres removed from the pool, and the mercury-filled spheres placed in storage under suitable conditions until they are used in the lamp making process. Storage of the mercury filled microspheres is done without the need for any special precautions or handling. The vapor pressure of - 35 mercury is sufficiently low at ambient conditions and 20919L7~
its surface tension sufficiently high to prevent the mercury from leaking or vaporizing out through the porous wall of the spheres. The amount of mercury that a hollow ceramic sphere according to the invention can contain is, of course, dependent on the size of the sphere and the cavity contained within.
For example, a 3 mm diamet~r alumina sphere having a 0.1 mm wall thickness will hold about 80 mg of morcury and a 1.5 mm diameter sphere of the same wall thickness will hold about 20 mg of mercury.
Turninq to Figure 2(a) there is shown, in schematic form, a partial section of one end of a fluorescent lamp construction prior to being sealed.
Thus, fluorescent lamp preassembly 20 comprises glass envelope 22 having a coating of on~ or more phosphors - 24 on the interior surface thereof and enclosing c~vity 26. Filament mount structure 28 is shown at one end of lamp 20 a~ comprising gla~s mount stem 30 which terminates at one end in flare portion 36 fused to ~nv-lop~ 22 at 38. Mount stem 30 contains a pair of electrically conductive lead~ 34 hermetically sealQd within and extending therethrough to one end of each o~ which is attached electrode 32 inside the lamp and the other end extends exterior of the lamp ~or subsequent connection to electrically conductive pins 54. The interior of electrode mount structure ~8 contains exhaust tube 40 which terminates inside the mount stem at exhaust hole 42. Prior to final se~ling the lamp, the assembly 20 is heated to about 300-C, exhausted, filled with argon at a pressure of about 2 torr and exhaust tube 40 is then tipped-off by heating to seal the lamp. The low pressure in the lamp assists in collapsing the exhaust tube and sealing it at the poin~ where it is heated by a torch (not shown) to achieve sealing and removal of the excess portion of the exhaust tube after sealing.
Heating the lamp assembly prior to exhausting or to applying a vacuum to the interior of the lamp envelope aids in outgassing the interior of the lamp. A mercury-containing ceramic sphere 10 is inserted into the lamp exhaust tube 40. In one embodiment the sphere passes through exhaust hole 42 and into interior cavity 26 wherein the mercury is released into the lamp due to the combination of heat and reduced pressure in the lamp. In another embodiment hole 42 is sufficiently small compared to the diameter of the sphere so as not to permit sphere 10 to pass therethrough into the interior cavity 26 of lamp envelope 22. The lamp assembly 20 is then exhausted through tube 40 and a suitable inert gas, such as argon at a pres~ure of about 4 torr, is fillad into the lamp through exhaust tube 40 and hole 42 either be~ore of after the mercury-containing sphere 10 i5 inserted into the exhaust tube, after which tube 40 i~ soaled as shown in Figure 2(b) containing ceramic sphere 10 enclosed either within it inside the interior of mount stem 30 or in the interior cavity 26 of the lamp. It is preferred to reta~n sphere 10 in the sealed and tipped-off remainder of the exhaust tub~ 40 within mount stem 30 BO th~t the sphere cannot abrade or scratch the phosphor coating 24 in the lamp. After the sealed lamp assembly 20 has cooled, end caps 52 and electrical connection pins 54 are assembled onto the lamp structure to produce the completed fluorescent lamp 50.
A number of 40 watt fluorescent lamps having a coating of a calcium halophosphate phosphor 24 disposed on the inside surface of lamp envelope 22 were made in four foot lengths, being typical F40T12 2 ~ 7 0 cool white fluorescent lamps common in both the home and in industry. About ten lamps were made wherein the mercury-containing ceramic sphere was introduced into the interior cavity 26 of the lamp through the exhaust tube 40 and exhaust hole 42. The sphere was 3 mm in diameter, contained 80 mg of mercury and was introduced into the lamp when the lamp had cooled to about 200-C, after which 4 torr of argon was introduced into the lamp and the exhaust tube tipped-off and sealed. Another batch of ten were prepared in a similar manner, but using a 1.5 mm diameter ceramic sphere 10 conta~ning about 20 mg of mercury which was introduced into the lamp cavity 26 after exhaustion and back filling with 4 torr of argon. The lamp was at a temperature of 200-C. ~oth batches of lamps were assembled with end caps and pins. These lamps wers all energized and started immediately and found to be operating satisfactorily with no 108~ in maintenance or performance after a p-riod of 6000 hours, at which time the lamps were turned off and the te~t was completed. This thus demonstrates a reduction to practice of the invention and the fact that the practice of the invention produces satisfactory fluore~cent lamps.
Claims (15)
1. A ceramic article having a porous wall structure and a hollow or cavity within wherein said cavity contains a liquid.
2. The article of claim 1 wherein said liquid comprises mercury.
3. The article of claim 2 being a sphere.
4. The article of claim 3 being alumina.
5. A method for introducing a liquid into a ceramic article having a porous wall structure and containing a hollow or cavity within which comprises the steps of (i) subjecting said ceramic to reduced pressure of a value and for a time sufficient to achieve the desired reduced pressure in said cavity, (ii) surrounding said ceramic with a liquid with which it is desired to introduce into said cavity and then (iii) increasing the pressure on said liquid surrounding said ceramic to force said liquid through said porous walls into said cavity.
6. The method of claim 5 wherein said liquid comprises mercury.
7. The method of claim 5 wherein said ceramic is a sphere.
8. The method of claim 7 wherein said ceramic is alumina.
9. An arc discharge lamp containing mercury and a ceramic article having a hollow cavity within said article, wherein at least a portion of said mercury in said lamp comes from within said ceramic article.
10. The lamp of claim 9 being a fluorescent lamp and wherein said ceramic article is present within a mount stem structure contained within said lamp.
11. The lamp of claim 9 wherein said ceramic is an alumina sphere.
12. The lamp of claim 10 wherein said ceramic is an alumina sphere.
13. A method of introducing mercury into a fluorescent lamp having an exhaust tube wherein the interior of said exhaust tube communicates with the interior of said lamp, said method comprising introducing a porous, mercury-containing ceramic article into said exhaust tube, subjecting said ceramic article to heat or heat and reduced pressure to release at least a portion of said mercury into said lamp interior and sealing said exhaust tube.
14. The method of claim 13 wherein said ceramic article is an alumina sphere.
15. The invention as defined in any of the preceding claims including any further features of novelty disclosed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US875,614 | 1978-02-06 | ||
| US87561492A | 1992-04-28 | 1992-04-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2091470A1 true CA2091470A1 (en) | 1993-10-29 |
Family
ID=25366082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2091470 Abandoned CA2091470A1 (en) | 1992-04-28 | 1993-03-11 | Method and apparatus for introducing mercury into arc discharge lamps |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0568317A1 (en) |
| JP (1) | JPH0620647A (en) |
| KR (1) | KR930022455A (en) |
| CA (1) | CA2091470A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1270598B (en) | 1994-07-07 | 1997-05-07 | Getters Spa | COMBINATION OF MATERIALS FOR MERCURY DISPENSING DEVICES PREPARATION METHOD AND DEVICES SO OBTAINED |
| IT1277239B1 (en) * | 1995-11-23 | 1997-11-05 | Getters Spa | DEVICE FOR THE EMISSION OF MERCURY, THE ABSORPTION OF REACTIVE GASES AND THE SHIELDING OF THE ELECTRODE INSIDE LAMPS |
| CA2177108C (en) * | 1996-05-22 | 2002-10-22 | Minoru Myojo | Low pressure mercury vapor filled discharge lamp |
| IT1291974B1 (en) | 1997-05-22 | 1999-01-25 | Getters Spa | DEVICE AND METHOD FOR THE INTRODUCTION OF SMALL QUANTITIES OF MERCURY IN FLUORESCENT LAMPS |
| IT1317117B1 (en) | 2000-03-06 | 2003-05-27 | Getters Spa | METHOD FOR THE PREPARATION OF MERCURY DISPENSING DEVICES FOR USE IN FLUORESCENT LAMPS |
| JP3688612B2 (en) * | 2000-09-22 | 2005-08-31 | 松下電器産業株式会社 | Mercury inclusion body, method for producing the mercury inclusion body, and fluorescent lamp using the mercury inclusion body |
| US6787980B2 (en) * | 2000-09-22 | 2004-09-07 | Matsushita Electric Industrial Co., Ltd. | Mercury-containing material, method for producing the same and fluorescent lamp using the same |
| ITMI20061344A1 (en) | 2006-07-11 | 2008-01-12 | Getters Spa | METHOD FOR RELEASING MERCURY |
| US7812533B2 (en) * | 2007-11-09 | 2010-10-12 | Osram Sylvania Inc. | Mercury dispenser, method of making mercury dispenser and method of dosing mercury into ARC discharge lamp |
| US8378571B2 (en) | 2007-11-09 | 2013-02-19 | Osram Sylvania Inc. | Precision mercury dispenser using wire |
| DE102010031366A1 (en) * | 2010-07-15 | 2012-01-19 | Osram Gesellschaft mit beschränkter Haftung | Pump tube for a gas discharge lamp, method for producing a pump tube for a gas discharge lamp, and method for filling a gas discharge lamp with a gas filling |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54118674A (en) * | 1978-03-08 | 1979-09-14 | Toshiba Corp | Low pressure mercury vapor discharge lamp |
| US4793980A (en) * | 1978-09-21 | 1988-12-27 | Torobin Leonard B | Hollow porous microspheres as substrates and containers for catalyst |
| JPS5790860A (en) * | 1980-11-26 | 1982-06-05 | Toshiba Corp | Metal halide lamp |
| DE8535777U1 (en) * | 1985-12-19 | 1988-07-21 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München | Storage element for dosing and introducing liquid mercury into a discharge lamp |
| DE3907277A1 (en) * | 1989-03-07 | 1990-09-20 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | MERCURY LOW PRESSURE DISCHARGE LAMP |
| JPH04141940A (en) * | 1990-10-01 | 1992-05-15 | Toshiba Lighting & Technol Corp | Mercury vapor discharge lamp an manufacture thereof |
-
1993
- 1993-03-11 CA CA 2091470 patent/CA2091470A1/en not_active Abandoned
- 1993-04-19 JP JP9031693A patent/JPH0620647A/en active Pending
- 1993-04-27 EP EP93303280A patent/EP0568317A1/en not_active Withdrawn
- 1993-04-27 KR KR1019930007056A patent/KR930022455A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| KR930022455A (en) | 1993-11-24 |
| JPH0620647A (en) | 1994-01-28 |
| EP0568317A1 (en) | 1993-11-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |