US2438562A - Seal for electric discharge devices and method of manufacture - Google Patents
Seal for electric discharge devices and method of manufacture Download PDFInfo
- Publication number
- US2438562A US2438562A US528182A US52818244A US2438562A US 2438562 A US2438562 A US 2438562A US 528182 A US528182 A US 528182A US 52818244 A US52818244 A US 52818244A US 2438562 A US2438562 A US 2438562A
- Authority
- US
- United States
- Prior art keywords
- tube
- metal
- quartz
- refractory metal
- layer
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
- H01J5/32—Seals for leading-in conductors
- H01J5/40—End-disc seals, e.g. flat header
- H01J5/42—End-disc seals, e.g. flat header using intermediate part
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2893/00—Discharge tubes and lamps
- H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
- H01J2893/0034—Lamp bases
Definitions
- This invention relates to electric discharge devices, and more especially to seals and terminal structures for such devices and to their manufacture. It is especially useful for devices employing quartz envelopes, such as high pressure metal vapor lamps referred to hereinafter as HPMV lamps.
- a limit is set on the power that can be dissipated in a HPMV lamp by the overheating of the electrodes, especially the anode ii the device is operated on D.
- the drawing is an elevation, in section, of a seal and electrode structure made in accordance with this invention.
- a metal that wets the layer e. an, as copper wets tune sten
- the manufacture oi a device comprising a sealed envelope of quartz comprises the following steps: (1) coating with an adherent layer of refractory metal, for example tungsten, the whole of the circumference of a quartz tube or of a part thereof; (2) collapsing onto the said tube part of another quartz tube, so that part of the said layer is embedded in (quartz, and another part lies in the space between the two tubes; (3) filling the said space with a molten metal (for example copper) which wets the said metal layer, and causing the said molten metal to cover the open end of the first said tube that lies within the second said tube (4) partially embedding in, or otherwise placing in intimate thermal contact with, the said molten metal a refractory metal. for example, a tungsten body; and (5) sealing the second said tube into the aperture of a quartz Q envelope. Steps (3) and (4) may be performed in the same operation.
- an adherent layer of refractory metal for example tungsten
- a device comprising a quartz envelope, comprises Within the envelope a body of refractory metal (A) in close thermal contact with metal which is continuous with metal (E) which (a) closes the inner end of a tube passing through the said envelope and unclosed at its outer end, (b) fills the space between the said tube (inner tube) and an outer tube surrounding it, the said tubes being fused together outside the said space and (c) wets a metal layer deposited on the outer side of the said inner tube and thereby makes a gas-tight junction with the inner tube.
- A body of refractory metal
- E which (a) closes the inner end of a tube passing through the said envelope and unclosed at its outer end, (b) fills the space between the said tube (inner tube) and an outer tube surrounding it, the said tubes being fused together outside the said space and (c) wets a metal layer deposited on the outer side of the said inner tube and thereby makes a gas-tight junction with the inner tube.
- 6 is the said inner tube, 2 the said outer tube.
- the outer tube carries on its outer surface the members 3 by means of which it is joined to the remainder of the envelope, a portion of which is indicated by the dotted lines ill.
- the inner tube is coated along part of its length with the layer :3 of tungsten or equivalent metal; part of the outer tube has been collapsed onto the inner tube, so that at E the tubes are completely united and at the layer l is embedded between them.
- i is a tune;- sten block which may serve as an electrode and from which a lead 3 passes to the exterior of the device down the inner tube 5.
- 9 is copper or equivalent metal filling: space between the inner and outer tubes and wetting the layer l where it is in contact with it; the block ii is partially embedded in it.
- the layer is formed on the tube l and the tube 2 collapsed onto it.
- the upper open end of the tube i is blocked by a stopper (indicated at it) through which the lead 8 passes, supporting the block just above the open end.
- Molten copper is then poured into the outer tube so as to fill up the space that it occupies in the figure. Air could enter the envelope only by passing between the copper and the quartz; it is prevented from doing so by intimate contact oi the copper with the tungsten layer t and of this layer with the quartz on which it is deposited.
- refractory metals may be used for the coating 4, such for example, as molybdenum or platinum.
- other metals than copper may be usec. for the filling; metal such for example, as silver.
- the metals copper and silver, 01 course, have lower melting points than tun aesasee sten, molybdenum or platinum and, unlike mercury for example, are solid at ordinary temperatures.
- the method of making a seal for high intensity electric discharge devices which comprises coating the outer surface of an inner quartz tube which is open at both ends with an adherent layer of refractory metal, collapsing onto the said tube part of an outer quartz tube so that part of the said layer is embedded in quartz and another part is exposed in the space between the two tubes, and filling the said space with a molten metal which has a substantially lower melting point than said refractory metal and which wets the said refractory metal and is solid at ordinary temperatures, and causing the said molten metal to cover over the adjacent open end of the inner tube, whereby to hermetically seal the said adjacent end of the inner tube by an air-tight bond between the said molten metal, the refractory metal and the wall of the said inner tube.
- the method of making a seal for high intensity electric discharge devices which comprises coating the outer surface of an inner quartz tube which is open at both ends with an adherent layer of refractory metal, collapsing onto the said tube part ofan outer quartz tube so that part of the said layer is embedded in quartz and another part is exposed in the space between the two tubes, and filling the said space with a molten metal which has a substantiallyv lower melting point thansaid refractory metal and which wets the said refractory metal and is solid at ordinary temperatures, and causing the said molten metal to cover over the adjacent open end of the inner tube and partially embedding a refractory metal electrode body in the said molten metal, whereby to hermetically seal the said adjacent end of the inner tube by an air-tight bond between the said molten metal, the refractory metal and the wall of the said inner tube.
- a seal and electrode structure for high intensity electric discharge devices comprising an inner quartz tube open at both ends and having on its outer surface a circumferentially extending adherent layer of refractory metal, an outer quartz tube surrounding said inner tube, portions of said tubes being fused together with at least a portion of the layer of refractory metal in the space between portions of the tubes not fused together, a quantity of a second metal which is solid at ordinary temperatures and which wets to the said refractory metal solidified in situ in the space between the tubes and covering over the adjacent end of theinner tube, the said second metal being wetted to the refractory metal layer on the inner tube and thereby forming a gas-tight junction with the tube, and a refractory metal electrode in close thermal contact with the said second metal.
- a seal and electrode structure for high intensity electric discharge devices comprising an inner quartz tube open at both ends and having on its outer surface a circumferentially extending adherent layer of refractory metal, an outer quartz tube surrounding said inner tube, portions of said tubes being fused together with a part of the said layer of metal embedded in the joint and another part in the space between portions of the tubes not fused together, a quantity of a second metal which is solid at ordinary temperatures and which wets to the said refractory metal solidified in situ in the space between the tubes 4 and covering over the'adjacent end of the inner tube, the said second metal being wetted to the refractorymetal layer on the inner tube and thereby forming a gas-tight junction with the tube, and a refractory metal electrode in close thermal contact with the said second metal.
- a seal and electrode structure for high intensity electric discharge devices comprising anv inner quartz tube open at both ends and having on its outer surface a circumferentially extending adherent layer of tungsten, an outer quartz tube surrounding said inner tube, portions of said tubes being fused together with at least a portion of the layer of tungsten in the space'between portions of the tubes not fused together, a quantity i of copper solidified in situ in the space between the tubes and covering over the adjacent end of the inner tube, the said copper being wetted to the tungsten layer on the inner tube and thereby forming a gas-tight junction with the tube, and a refractory metal electrode in close thermal contact with the said copper.
- the method of making a seal for high intensity electric discharge devices which comprises bringing into telescoping relation a surrounding outer quartz tube and an inner quartz tube externally coated over an intermediate portion of its length within the outer tube with a circumferentially extending adherent layer of refractory metal, the relative sizes of said tubes for at least part of their lengths affording space between them around one end of the inner tube and at least part of its said adherent refractory metal layer; fusing together portions of said tubes, while leaving the aforesaid space between them; filling v said space with other metal, in molten condition,
- a seal for high intensity electric discharge devices comprising an inner quartz tube open at both ends and having its outer surface coated with an adherent layer of refractory metal, a larger outer quartz tube around said inner tube having part thereof collapsed onto the inner tube so that part of said layer is embedded in quartz, while another part extends into a space between the two tubes, and a quantity of another metal which has a lower melting point than the said refractory metal and which wets the said refractory metal and is solid at ordinary temperatures filling the said space, and covering over the adjacent end of the said inner tube, thereby hermetically sealing the said end of the inner tube by an air-tight bond between. the second mentioned metal, the refractory metal and the wall of said inner tube.
- a composite assembly comprising a quartz tube, a circumferentially extending deposit of refractorymetal in intimate contact with the outer surface of said tube adjacent one open end thereof, and a body of another metal which wets the said refractory metal and is solid at ordinary temperatures enclosing and covering over the said end of the tube and forming a gas-tight junction with said tube directly through said deposit of 10.
- a composite assembly comprising a quartz tube, a body of copper enclosing and covering over one open end of said tube, and an intervening deposit of tungsten in direct intimate gas-tight contact between the outer surface of said tube and the adjoining surface of said body hermetically sealing said body to said tube, the said body of copper being wetted to the said deposit of tungsten.
- a composite assembly for an electric discharge device comprising a quartz tube, a body of metal enclosing and covering over one open end of said tube, and an intervening deposit of refractory metal in direct intimate gas-tight contact between the outer surface of said tube and the adjoining surface of said body hermetically sealing said body to said tube, said body being of metal which wets the said refractory metal and is solid at ordinary temperatures, and an electrade of refractory metal partially embedded in said body.
- the method of making a seal for high intensity electric discharge devices which comprises depositing a layer of refractory metal in intimate gas-tight contact with the outer surface of a quartz tube and adjacent one open end thereof, and casting around and over the said end of the tube, including a portion having the layer of refractory metal thereon, a molten metal which wets the said refractory metal and is solid at ordinary temperatures, whereby to form a body of the cast metal enclosing the said end of the tube and making a gas-tight junction therewith.
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Description
March30, 1948. E, KETTL WELL 2,438,562
SEAL FOR ELECTRIC DISCHARGE DEVICES AND METHOD OF MANUFACTURE Filed March 27, 1944 hven'ta': I Eric ke't'tlewell, by M' v HisAfiorneg.
Patented Mar. 30, 1948 SEAL FOR ELECTRIC DISCHARGE DEVICES AND METHOD OF MANUFACTURE Eric Kettleweil, Kingsbury, London, England, aslignor to General Electric Company, a corporation of New York Application March 27, 1944, Serial No. 528,182
In Great Britain March 13, 1942 Section 1, Public Law 690, August 8, 1946 Patent expires March 13, 1962 12' Claims. 1
This invention relates to electric discharge devices, and more especially to seals and terminal structures for such devices and to their manufacture. It is especially useful for devices employing quartz envelopes, such as high pressure metal vapor lamps referred to hereinafter as HPMV lamps.
A limit is set on the power that can be dissipated in a HPMV lamp by the overheating of the electrodes, especially the anode ii the device is operated on D. C. The limit could be iii-=- creased if the electrode could be placed in close thermal connection with the exterior of the envelope, as is the anti-cathode in many X-ray.
tubes; for then water-or forced air-cooling could be applied to it. But, while the envelopes of X-ray tubes are usually of glass, having a comparatively high coeiliclent of thermal expansion, those of the l-IPMV lamps in which the limitation is serious are generally of quartz. Many of the devices used in li -ray tubes for the purpose are not readily applicable to .EJPMV lamps of quartz. The object of this invention is to modify these devices so that they are applicable to lamps with quartz envelopes.
The drawing is an elevation, in section, of a seal and electrode structure made in accordance with this invention.
The method depends on the fact that a layer of tungsten, and possibly certain other metals, can be deposited on quartz so that (l) a metal that wets the layer (e. an, as copper wets tune sten) can be made to form a gas=tiaht junction with the quartz and (2) the layer can be sealed into quartz by the technique employed in making a strip seal.
According to one aspect of the invention, the manufacture oi a device comprising a sealed envelope of quartz comprises the following steps: (1) coating with an adherent layer of refractory metal, for example tungsten, the whole of the circumference of a quartz tube or of a part thereof; (2) collapsing onto the said tube part of another quartz tube, so that part of the said layer is embedded in (quartz, and another part lies in the space between the two tubes; (3) filling the said space with a molten metal (for example copper) which wets the said metal layer, and causing the said molten metal to cover the open end of the first said tube that lies within the second said tube (4) partially embedding in, or otherwise placing in intimate thermal contact with, the said molten metal a refractory metal. for example, a tungsten body; and (5) sealing the second said tube into the aperture of a quartz Q envelope. Steps (3) and (4) may be performed in the same operation.
According to another aspect of the invention, a device, comprising a quartz envelope, comprises Within the envelope a body of refractory metal (A) in close thermal contact with metal which is continuous with metal (E) which (a) closes the inner end of a tube passing through the said envelope and unclosed at its outer end, (b) fills the space between the said tube (inner tube) and an outer tube surrounding it, the said tubes being fused together outside the said space and (c) wets a metal layer deposited on the outer side of the said inner tube and thereby makes a gas-tight junction with the inner tube.
One embodiment of the invention will now be described by way oi example with reference to the accompanying drawing. 6 is the said inner tube, 2 the said outer tube. The outer tube carries on its outer surface the members 3 by means of which it is joined to the remainder of the envelope, a portion of which is indicated by the dotted lines ill. The inner tube is coated along part of its length with the layer :3 of tungsten or equivalent metal; part of the outer tube has been collapsed onto the inner tube, so that at E the tubes are completely united and at the layer l is embedded between them. i is a tune;- sten block which may serve as an electrode and from which a lead 3 passes to the exterior of the device down the inner tube 5. 9 is copper or equivalent metal filling: space between the inner and outer tubes and wetting the layer l where it is in contact with it; the block ii is partially embedded in it.
In making the device, the layer is formed on the tube l and the tube 2 collapsed onto it. The upper open end of the tube i is blocked by a stopper (indicated at it) through which the lead 8 passes, supporting the block just above the open end. Molten copper is then poured into the outer tube so as to fill up the space that it occupies in the figure. Air could enter the envelope only by passing between the copper and the quartz; it is prevented from doing so by intimate contact oi the copper with the tungsten layer t and of this layer with the quartz on which it is deposited.
It will be obvious those skilled in the art that other refractory metals may be used for the coating 4, such for example, as molybdenum or platinum. Moreover, other metals than copper may be usec. for the filling; metal such for example, as silver. The metals copper and silver, 01 course, have lower melting points than tun aesasee sten, molybdenum or platinum and, unlike mercury for example, are solid at ordinary temperatures.
What I claim as new and desire to secure by Letters Patent of the United States is:
l. The method of making a seal for high intensity electric discharge devices which comprises coating the outer surface of an inner quartz tube which is open at both ends with an adherent layer of refractory metal, collapsing onto the said tube part of an outer quartz tube so that part of the said layer is embedded in quartz and another part is exposed in the space between the two tubes, and filling the said space with a molten metal which has a substantially lower melting point than said refractory metal and which wets the said refractory metal and is solid at ordinary temperatures, and causing the said molten metal to cover over the adjacent open end of the inner tube, whereby to hermetically seal the said adjacent end of the inner tube by an air-tight bond between the said molten metal, the refractory metal and the wall of the said inner tube.
2. The method of making a seal for high intensity electric discharge devices which comprises coating the outer surface of an inner quartz tube which is open at both ends with an adherent layer of refractory metal, collapsing onto the said tube part ofan outer quartz tube so that part of the said layer is embedded in quartz and another part is exposed in the space between the two tubes, and filling the said space with a molten metal which has a substantiallyv lower melting point thansaid refractory metal and which wets the said refractory metal and is solid at ordinary temperatures, and causing the said molten metal to cover over the adjacent open end of the inner tube and partially embedding a refractory metal electrode body in the said molten metal, whereby to hermetically seal the said adjacent end of the inner tube by an air-tight bond between the said molten metal, the refractory metal and the wall of the said inner tube.
3. A seal and electrode structure for high intensity electric discharge devices comprising an inner quartz tube open at both ends and having on its outer surface a circumferentially extending adherent layer of refractory metal, an outer quartz tube surrounding said inner tube, portions of said tubes being fused together with at least a portion of the layer of refractory metal in the space between portions of the tubes not fused together, a quantity of a second metal which is solid at ordinary temperatures and which wets to the said refractory metal solidified in situ in the space between the tubes and covering over the adjacent end of theinner tube, the said second metal being wetted to the refractory metal layer on the inner tube and thereby forming a gas-tight junction with the tube, and a refractory metal electrode in close thermal contact with the said second metal.
4. A seal and electrode structure for high intensity electric discharge devices comprising an inner quartz tube open at both ends and having on its outer surface a circumferentially extending adherent layer of refractory metal, an outer quartz tube surrounding said inner tube, portions of said tubes being fused together with a part of the said layer of metal embedded in the joint and another part in the space between portions of the tubes not fused together, a quantity of a second metal which is solid at ordinary temperatures and which wets to the said refractory metal solidified in situ in the space between the tubes 4 and covering over the'adjacent end of the inner tube, the said second metal being wetted to the refractorymetal layer on the inner tube and thereby forming a gas-tight junction with the tube, and a refractory metal electrode in close thermal contact with the said second metal.
5. A seal and electrode structure for high intensity electric discharge devices comprising anv inner quartz tube open at both ends and having on its outer surface a circumferentially extending adherent layer of tungsten, an outer quartz tube surrounding said inner tube, portions of said tubes being fused together with at least a portion of the layer of tungsten in the space'between portions of the tubes not fused together, a quantity i of copper solidified in situ in the space between the tubes and covering over the adjacent end of the inner tube, the said copper being wetted to the tungsten layer on the inner tube and thereby forming a gas-tight junction with the tube, and a refractory metal electrode in close thermal contact with the said copper.
6. The method of making a seal for high intensity electric discharge devices which comprises bringing into telescoping relation a surrounding outer quartz tube and an inner quartz tube externally coated over an intermediate portion of its length within the outer tube with a circumferentially extending adherent layer of refractory metal, the relative sizes of said tubes for at least part of their lengths affording space between them around one end of the inner tube and at least part of its said adherent refractory metal layer; fusing together portions of said tubes, while leaving the aforesaid space between them; filling v said space with other metal, in molten condition,
which has a substantially lower melting point than said refractory metal and which wets to the said refractory metal and is solid at ordinary temperatures, and also causing this molten metal to cover over the adjacent end of the inner tube; and bringing a refractory metal electrode into close thermal contact with the said other metal, which is allowed to solidify in situ, whereby to hermetically seal the said adjacent end of the inner tube by an air-tight bond between the said molten metal, the refractory metal and the wall of the said inner tube.
7. A seal for high intensity electric discharge devices comprising an inner quartz tube open at both ends and having its outer surface coated with an adherent layer of refractory metal, a larger outer quartz tube around said inner tube having part thereof collapsed onto the inner tube so that part of said layer is embedded in quartz, while another part extends into a space between the two tubes, and a quantity of another metal which has a lower melting point than the said refractory metal and which wets the said refractory metal and is solid at ordinary temperatures filling the said space, and covering over the adjacent end of the said inner tube, thereby hermetically sealing the said end of the inner tube by an air-tight bond between. the second mentioned metal, the refractory metal and the wall of said inner tube.
8. A composite assembly comprising a quartz tube, a circumferentially extending deposit of refractorymetal in intimate contact with the outer surface of said tube adjacent one open end thereof, and a body of another metal which wets the said refractory metal and is solid at ordinary temperatures enclosing and covering over the said end of the tube and forming a gas-tight junction with said tube directly through said deposit of 10. A composite assembly comprising a quartz tube, a body of copper enclosing and covering over one open end of said tube, and an intervening deposit of tungsten in direct intimate gas-tight contact between the outer surface of said tube and the adjoining surface of said body hermetically sealing said body to said tube, the said body of copper being wetted to the said deposit of tungsten.
11. A composite assembly for an electric discharge device comprising a quartz tube, a body of metal enclosing and covering over one open end of said tube, and an intervening deposit of refractory metal in direct intimate gas-tight contact between the outer surface of said tube and the adjoining surface of said body hermetically sealing said body to said tube, said body being of metal which wets the said refractory metal and is solid at ordinary temperatures, and an electrade of refractory metal partially embedded in said body.
12. The method of making a seal for high intensity electric discharge devices which comprises depositing a layer of refractory metal in intimate gas-tight contact with the outer surface of a quartz tube and adjacent one open end thereof, and casting around and over the said end of the tube, including a portion having the layer of refractory metal thereon, a molten metal which wets the said refractory metal and is solid at ordinary temperatures, whereby to form a body of the cast metal enclosing the said end of the tube and making a gas-tight junction therewith.
ERIC KE'I'ILEWELL.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,159,335 Keyes Nov. 2, 1915 1,740,397 Fehse Dec, 17, 1929 1,803,541 Aba May 5,1931 2,023,931 McCullough Dec. 10, 1935 2,128,178 White Aug. 23, 1938 2,138,224 Barasch Nov. 29, 1938 2,200,939 Trebbin May 14, 1940 2,279,831 Lempert Apr. 14, 1942
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2438562X | 1942-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2438562A true US2438562A (en) | 1948-03-30 |
Family
ID=10906947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US528182A Expired - Lifetime US2438562A (en) | 1942-03-13 | 1944-03-27 | Seal for electric discharge devices and method of manufacture |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2438562A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2876377A (en) * | 1955-09-01 | 1959-03-03 | Westinghouse Electric Corp | Ribbon seal and method of fabrication |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1159335A (en) * | 1913-03-06 | 1915-11-02 | Arthur A Noyes | Seal for vacuum apparatus. |
| US1740397A (en) * | 1926-11-12 | 1929-12-17 | Gen Electric | Seal and method for making the same |
| US1803541A (en) * | 1929-12-03 | 1931-05-05 | Neon Appliances Ltd | Process of attaching external electrodes |
| US2023931A (en) * | 1928-06-18 | 1935-12-10 | Union Nat Bank Of Pittsburgh | Method of mounting tubular electrodes inside the vessels of space discharge devices |
| US2128173A (en) * | 1937-11-27 | 1938-08-23 | Gen Electric | Method of making stems for sealed electrical devices |
| US2138224A (en) * | 1937-01-12 | 1938-11-29 | Barasch Hans Pius | Method of sealing electrical conductors into vitreous envelopes |
| US2200939A (en) * | 1937-08-15 | 1940-05-14 | Gen Electric | Gaseous electric discharge lamp device |
| US2279831A (en) * | 1941-04-30 | 1942-04-14 | Westinghouse Electric & Mfg Co | Discharge device and method of making |
-
1944
- 1944-03-27 US US528182A patent/US2438562A/en not_active Expired - Lifetime
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1159335A (en) * | 1913-03-06 | 1915-11-02 | Arthur A Noyes | Seal for vacuum apparatus. |
| US1740397A (en) * | 1926-11-12 | 1929-12-17 | Gen Electric | Seal and method for making the same |
| US2023931A (en) * | 1928-06-18 | 1935-12-10 | Union Nat Bank Of Pittsburgh | Method of mounting tubular electrodes inside the vessels of space discharge devices |
| US1803541A (en) * | 1929-12-03 | 1931-05-05 | Neon Appliances Ltd | Process of attaching external electrodes |
| US2138224A (en) * | 1937-01-12 | 1938-11-29 | Barasch Hans Pius | Method of sealing electrical conductors into vitreous envelopes |
| US2200939A (en) * | 1937-08-15 | 1940-05-14 | Gen Electric | Gaseous electric discharge lamp device |
| US2128173A (en) * | 1937-11-27 | 1938-08-23 | Gen Electric | Method of making stems for sealed electrical devices |
| US2279831A (en) * | 1941-04-30 | 1942-04-14 | Westinghouse Electric & Mfg Co | Discharge device and method of making |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2876377A (en) * | 1955-09-01 | 1959-03-03 | Westinghouse Electric Corp | Ribbon seal and method of fabrication |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3726582A (en) | Electric discharge lamp comprising container of densely sintered aluminum oxide | |
| US2279831A (en) | Discharge device and method of making | |
| US2100187A (en) | Entrance insulation for electrical conductors | |
| US3531853A (en) | Method of making a ceramic-to-metal seal | |
| US4011480A (en) | Electric discharge lamp | |
| US3742283A (en) | Press seal for lamp having fused silica envelope | |
| US2163408A (en) | Vacuum-tight seal | |
| US2212556A (en) | Method of manufacturing electric discharge tubes | |
| US2504521A (en) | Quartz-to-metal seal | |
| US2438562A (en) | Seal for electric discharge devices and method of manufacture | |
| US6563265B1 (en) | Applying prealloyed powders as conducting members to arc tubes | |
| EP0160316B1 (en) | Single-ended high intensity discharge lamp and manufacture | |
| US4668204A (en) | Single-ended high intensity discharge lamp and manufacture | |
| US2023931A (en) | Method of mounting tubular electrodes inside the vessels of space discharge devices | |
| US8277274B2 (en) | Apparatus and methods for use of refractory abhesives in protection of metallic foils and leads | |
| US2138224A (en) | Method of sealing electrical conductors into vitreous envelopes | |
| US2078892A (en) | Vacuum tube and method of making the same | |
| US3278778A (en) | High-current seal for electric discharge lamp | |
| US2123015A (en) | Seal for discharge lamps | |
| GB1583846A (en) | Closing of electric discharge tubes | |
| US2409361A (en) | Seal for electric lamps and similar devices | |
| US2412836A (en) | Electron discharge device | |
| US6590340B1 (en) | High pressure discharge lamp with tungsten electrode rods having first and second parts | |
| US3866280A (en) | Method of manufacturing high pressure sodium arc discharge lamp | |
| US2231459A (en) | Electrical conductor for vapor electric devices |