US2212556A - Method of manufacturing electric discharge tubes - Google Patents

Method of manufacturing electric discharge tubes Download PDF

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US2212556A
US2212556A US123205A US12320537A US2212556A US 2212556 A US2212556 A US 2212556A US 123205 A US123205 A US 123205A US 12320537 A US12320537 A US 12320537A US 2212556 A US2212556 A US 2212556A
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seals
glass
electric discharge
ceramic
tube
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US123205A
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Baier Otto
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Alcatel Lucent Deutschland AG
C Lorenz AG
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Standard Elektrik Lorenz AG
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
    • C04B37/02—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles
    • C04B37/023—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used
    • C04B37/025—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used consisting of glass or ceramic material
    • 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
    • H01J5/20—Seals between parts of vessels
    • H01J5/22—Vacuum-tight joints between parts of vessel
    • H01J5/24—Vacuum-tight joints between parts of vessel between insulating parts of vessel
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
    • C04B2237/10—Glass interlayers, e.g. frit or flux
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
    • C04B2237/32—Ceramic
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
    • C04B2237/40—Metallic
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/59—Aspects relating to the structure of the interlayer
    • C04B2237/592—Aspects relating to the structure of the interlayer whereby the interlayer is not continuous, e.g. not the whole surface of the smallest substrate is covered by the interlayer
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/62—Forming laminates or joined articles comprising holes, channels or other types of openings
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/64—Forming laminates or joined articles comprising grooves or cuts
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/76—Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/78—Side-way connecting, e.g. connecting two plates through their sides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/80—Joining the largest surface of one substrate with a smaller surface of the other substrate, e.g. butt joining or forming a T-joint
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/84—Joining of a first substrate with a second substrate at least partially inside the first substrate, where the bonding area is at the inside of the first substrate, e.g. one tube inside another tube
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/88—Joining of two substrates, where a substantial part of the joining material is present outside of the joint, leading to an outside joining of the joint
    • 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
    • H01J2893/0037—Solid sealing members other than lamp bases
    • H01J2893/0038—Direct connection between two insulating elements, in particular via glass material

Definitions

  • the invention relates to a novel method of manufacturing such tubes. More particularly, the invention is concerned with tubes of the kind wherein parts thereof are held together by glass seals or seals of another suitable material, and one of its objects is to produce such seals in a furnace in order to employ a nonoxidizing or reducing atmosphere and in this way to protect the electrodes from oxidizing.
  • FIG. 1 is a partially diagrammatic sectional view of an electron tube of the kind adapted to be manufactured by the novel method.
  • Fig. 2 is a sectional view representing another kind of electron tube with which the invention is applicable.
  • Fig. 3 is a partially diagrammatic sectional view illustrating a slight modification of the device shown in Fig. 1.
  • the tube shown in Fig. 1 has a vacuum vessel which is composed of a ceramic cylinder l, formed integral with an end wall or bottom 2 by any known method, and of a ceramic cover 3.
  • Bottom 2 carries two conductors 4, 5.
  • Two conductors 6, I are carried by cover 3. These conductors are fastened to bottom 2 or cover 3 by glass seals 20, 2!, 22, 23 and are connected to electrodes 34, 35, 36, 31 which are in this way supported by them.
  • conductor 4 is joined to the anode 34 while conductor 5 is connected to a suppressor grid 35.
  • Conductor 6 is secured to grid 36, and conductor 1 is connected to the cathode 31.
  • Such electrodes are shown in dotted lines and in a purely diagrammatic manner, since they are immaterial to the invention.
  • Cover 3 has a tubular extension 8 that serves for evacu-. ating the vessel in a well known manner. After such evacuation the vessel is sealed off at 3.
  • the manufacture of the tube is as follows.
  • the conductors 4, 5 are sealed into the bottom 2 while conductors 6, l are sealed into cover 3, this being done by means of the seals 20 to 23 which may consist of hard glass, for instance.
  • the conductors are fastened or welded to the electrodes either before producing the seals or thereafter. In the case represented by way of example it is best to fasten them thereto prior to producing the seals 20 to 23 and then to proceed as follows.
  • the conductors 4 to 1,.fixed to the electrodes 34 to 31, are inserted in bores of the parts 2, 3, whereupon the seals 20 to 23 are produced in order to fasten these conductors in such bores.
  • the scaling is best effected in a furnace, the advantage being that a reducing atmosphere can be employed in order to prevent the electrodes from oxidizing.
  • the two structures I, 2, 4, 5, 20, 2i and 6, I, 3, 22, 23 are then placed together, when the second melting operation has to be effected.
  • This consists in producing the seal 10 by which the cover 3 and cylinder I are firmly held together.
  • this melting too is accomplished in a furnace in order to ensure a perfect result.
  • such second melting operation is effected by means of a material which is of a lower melting point than the sealing material at 20 to 23. While as stated hard glass or the like is suitable for the seals 20 to 23, so called soldering glass may be used for the seal Ill.
  • the tube is then evacuated in a well known manner by means of a pump connected with the tubular extension 8 by the intermediary of a piece of glass tube inserted over extension 8.
  • This piece of glass is sealed off after evacuation so as to form a glass seal 9, as is well known with devices of this kind.
  • Such glass tube is preferably likewise of a hard glass. This is possible here since the sealing off is effected with the aid of a pointed flame so as to cause only a local heating. The remaining melting spots may be protected from the influence of heat.
  • the ceramic bodies may be so constructed that they are not subjected to mutual displacement during the time in which the several melting operations are effected.
  • cover 3 may be provided with an annular groove adapted to receive the open end of cylinder I.
  • the methods of tooling ceramic material have been so improved that accuracies of a fraction of one millimeter can be obtained. This is advantageous above all in the case of electron tubes made of a ceramic material, since material of this nature permits the desired proportions to be adhered to very closely.
  • the novel method is therefore particularly suitable in the case of tubes intended for very short wave lengths, the inner dimensions of the tube being as predetermined.
  • the anode 34 is arranged to form part of the vacuum vesmaterial.
  • the anode 34 has cooling ilns II and is preferably made of copper.
  • the anode has an annular projection it .at each oi its face ends. In these projections the cylinders l2, I! are seated. Preferably, the projections l8 are shrunk onto these cylinders.
  • Electrode leads 4 are illustrated but the electrodes provided in addition to the anode 34 are not shown in Fig. 2 as their structure is not material to the practising of the invention.
  • Fig. 2 The parts represented in Fig. 2 are rigidly interconnected by annular seals l0, l8, l1, l8. which may be done by tubular pieces of glass, for instance, which are inserted over the parts to be fastened to each other and are then caused in a furnace to melt.
  • the seals l'l, i8 are produced in a first melting operation by means of a hard glass or similar
  • the seals l0, it are made in a second operation and consist of a material having a lower melting point than the material of which seals l1, l8 are made.
  • tubular extension 8 is made in one with cover 3. Tubes of this kind being very small, however, extension 8 and cover 3 are easy to in- Jure in the course of manufacture. Therefore,
  • the tubular extension 8 may be fixed in a recess o? he cover 3 by means of a seal 24 whose melting point is lower than that of The vacuum vessel further consists of the seals 20 to 28.
  • the seals i0 and 24 may thus be produced in the same operation. In other respects the construction represented in Fig. 3.
  • the method of manufacturing a discharge tube having envelope part of ceramic material and at least one portion of metal which comprises Joining the metal portion to a ceramic part by one melting operation using a material having a high melting point, such as hard glass, and subsequently Joining said one ceramic portion to another ceramic portion by a melting operation using another material having a lower melting point, such as soft glass.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Description

Aug. 27, 1940. o. BAIER 2,212,556
METHOD OF MANUFACTURING ELECTRIC DISCHARGE TUBES Filed Jan. 50, 1937 Patented Aug. 27, 1940 UNITED STATES PATENT OFFICE METHOD OF MANUFACTURING ELECTRIC DISCHARGE TUBES Application January 30, 1937, Serial No. 123,205 In Germany January 28, 1936 3 Claims.
Methods of producing and tooling ceramic materials of the kind adapted for use with electric devices, especially high frequency devices, have been improved in such a manner that discharge vessels and the like can be manufactured mainly from ceramic materials.
The invention relates to a novel method of manufacturing such tubes. More particularly, the invention is concerned with tubes of the kind wherein parts thereof are held together by glass seals or seals of another suitable material, and one of its objects is to produce such seals in a furnace in order to employ a nonoxidizing or reducing atmosphere and in this way to protect the electrodes from oxidizing.
Other objects and advantages will be understood from the following description, reference being had to the accompanying drawing in which Fig. 1 is a partially diagrammatic sectional view of an electron tube of the kind adapted to be manufactured by the novel method. Fig. 2 is a sectional view representing another kind of electron tube with which the invention is applicable. Fig. 3 is a partially diagrammatic sectional view illustrating a slight modification of the device shown in Fig. 1.
The tube shown in Fig. 1 has a vacuum vessel which is composed of a ceramic cylinder l, formed integral with an end wall or bottom 2 by any known method, and of a ceramic cover 3. Bottom 2 carries two conductors 4, 5. Two conductors 6, I are carried by cover 3. These conductors are fastened to bottom 2 or cover 3 by glass seals 20, 2!, 22, 23 and are connected to electrodes 34, 35, 36, 31 which are in this way supported by them. For instance, conductor 4 is joined to the anode 34 while conductor 5 is connected to a suppressor grid 35. Conductor 6 is secured to grid 36, and conductor 1 is connected to the cathode 31. Such electrodes are shown in dotted lines and in a purely diagrammatic manner, since they are immaterial to the invention. Cover 3 has a tubular extension 8 that serves for evacu-. ating the vessel in a well known manner. After such evacuation the vessel is sealed off at 3.
The manufacture of the tube is as follows.
The conductors 4, 5 are sealed into the bottom 2 while conductors 6, l are sealed into cover 3, this being done by means of the seals 20 to 23 which may consist of hard glass, for instance. The conductors are fastened or welded to the electrodes either before producing the seals or thereafter. In the case represented by way of example it is best to fasten them thereto prior to producing the seals 20 to 23 and then to proceed as follows. The conductors 4 to 1,.fixed to the electrodes 34 to 31, are inserted in bores of the parts 2, 3, whereupon the seals 20 to 23 are produced in order to fasten these conductors in such bores. The scaling is best effected in a furnace, the advantage being that a reducing atmosphere can be employed in order to prevent the electrodes from oxidizing. The two structures I, 2, 4, 5, 20, 2i and 6, I, 3, 22, 23 are then placed together, when the second melting operation has to be effected. This consists in producing the seal 10 by which the cover 3 and cylinder I are firmly held together. Preferably, this melting too is accomplished in a furnace in order to ensure a perfect result. In order however to avoid the seals 20 to 23 becoming soft, thus admitting of displacement of the electrodes, such second melting operation is effected by means of a material which is of a lower melting point than the sealing material at 20 to 23. While as stated hard glass or the like is suitable for the seals 20 to 23, so called soldering glass may be used for the seal Ill. The tube is then evacuated in a well known manner by means of a pump connected with the tubular extension 8 by the intermediary of a piece of glass tube inserted over extension 8. This piece of glass is sealed off after evacuation so as to form a glass seal 9, as is well known with devices of this kind. Such glass tube is preferably likewise of a hard glass. This is possible here since the sealing off is effected with the aid of a pointed flame so as to cause only a local heating. The remaining melting spots may be protected from the influence of heat.
In connection with the here described method gauges or other devices adapted to attain the highest degree of accuracy may be employed. The ceramic bodies may be so constructed that they are not subjected to mutual displacement during the time in which the several melting operations are effected. For instance, cover 3 may be provided with an annular groove adapted to receive the open end of cylinder I. The methods of tooling ceramic material have been so improved that accuracies of a fraction of one millimeter can be obtained. This is advantageous above all in the case of electron tubes made of a ceramic material, since material of this nature permits the desired proportions to be adhered to very closely. The novel method is therefore particularly suitable in the case of tubes intended for very short wave lengths, the inner dimensions of the tube being as predetermined.
In the construction shown in Fig. 2 the anode 34 is arranged to form part of the vacuum vesmaterial.
sel. This tube is of small dimensions while being intended for greater demands. The anode 34 has cooling ilns II and is preferably made of copper. two cylinders I2, I! and two covers l4, 3. The anode has an annular projection it .at each oi its face ends. In these projections the cylinders l2, I! are seated. Preferably, the projections l8 are shrunk onto these cylinders.
Electrode leads 4, are illustrated but the electrodes provided in addition to the anode 34 are not shown in Fig. 2 as their structure is not material to the practising of the invention.
The parts represented in Fig. 2 are rigidly interconnected by annular seals l0, l8, l1, l8. which may be done by tubular pieces of glass, for instance, which are inserted over the parts to be fastened to each other and are then caused in a furnace to melt.
The seals l'l, i8 are produced in a first melting operation by means of a hard glass or similar The seals l0, it are made in a second operation and consist of a material having a lower melting point than the material of which seals l1, l8 are made.
In the construction represented in Figs. 1 and 2 the tubular extension 8 is made in one with cover 3. Tubes of this kind being very small, however, extension 8 and cover 3 are easy to in- Jure in the course of manufacture. Therefore,
as shown in Fig. 3, the tubular extension 8 may be fixed in a recess o? he cover 3 by means of a seal 24 whose melting point is lower than that of The vacuum vessel further consists of the seals 20 to 28. The seals i0 and 24 may thus be produced in the same operation. In other respects the construction represented in Fig. 3.
is the same as that shown in Fla. 1.
What is claimed is:
i. The method of manufacturing a discharge tube having envelope part of ceramic material and at least one portion of metal, which comprises Joining the metal portion to a ceramic part by one melting operation using a material having a high melting point, such as hard glass, and subsequently Joining said one ceramic portion to another ceramic portion by a melting operation using another material having a lower melting point, such as soft glass.
2. ,A method in accordance with claim 1 wherein the Joining operation is carried out in a reducing atmosphere.
3. The method of manufacturing a discharge tube having portions of ceramic material, forming at least a part of the envelope tube, and parts of metal including a member extending through a bore in one of said portions of ceramic material, which comprises: sealing'the metallic member in said bore with a material having a high melting point such as hard glass, then attaching an electrode to said member, and finally Joining the portions of ceramic material together by a melting operation using a sealing material having a relatively low melting point,
such as soft glass.
O'I'I'O BAIER.
US123205A 1936-01-28 1937-01-30 Method of manufacturing electric discharge tubes Expired - Lifetime US2212556A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2458945A (en) * 1942-03-18 1949-01-11 Hartford Nat Bank & Trust Co Electric discharge tube comprising electrodes secured to rods
US2505066A (en) * 1947-09-17 1950-04-25 Bell Telephone Labor Inc Method of making assemblies of resistor bodies
US2556059A (en) * 1949-06-21 1951-06-05 Tung Sol Lamp Works Inc Electric incandescent lamp and method of manufacturing
US2695442A (en) * 1947-08-26 1954-11-30 Hartford Nat Bank & Trust Co Method of manufacturing electric discharge tubes
US2802131A (en) * 1952-11-21 1957-08-06 Rauland Corp Ionic discharge device construction
US2812466A (en) * 1953-06-08 1957-11-05 Eitel Mccullough Inc Ceramic electron tube
US2813218A (en) * 1951-04-20 1957-11-12 Philips Corp Electric discharge tube
US3239322A (en) * 1961-05-24 1966-03-08 Gen Electric Process for sealing vacuum-tight spinel bodies
US3239323A (en) * 1961-06-28 1966-03-08 Gen Electric Method for sealing ceramics
US3298083A (en) * 1964-01-02 1967-01-17 Rca Corp Method of making electron gun mount
US3365284A (en) * 1968-01-23 Vincent J Alessi Method and apparatus for making a circuit component with a circuit element and wire leads sealed in a glass sleeve
US3376376A (en) * 1964-06-16 1968-04-02 Corning Glass Works Miniature transistor enclosed in a glass disc-shaped housing

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3365284A (en) * 1968-01-23 Vincent J Alessi Method and apparatus for making a circuit component with a circuit element and wire leads sealed in a glass sleeve
US2458945A (en) * 1942-03-18 1949-01-11 Hartford Nat Bank & Trust Co Electric discharge tube comprising electrodes secured to rods
US2695442A (en) * 1947-08-26 1954-11-30 Hartford Nat Bank & Trust Co Method of manufacturing electric discharge tubes
US2505066A (en) * 1947-09-17 1950-04-25 Bell Telephone Labor Inc Method of making assemblies of resistor bodies
US2556059A (en) * 1949-06-21 1951-06-05 Tung Sol Lamp Works Inc Electric incandescent lamp and method of manufacturing
US2813218A (en) * 1951-04-20 1957-11-12 Philips Corp Electric discharge tube
US2802131A (en) * 1952-11-21 1957-08-06 Rauland Corp Ionic discharge device construction
US2812466A (en) * 1953-06-08 1957-11-05 Eitel Mccullough Inc Ceramic electron tube
US3239322A (en) * 1961-05-24 1966-03-08 Gen Electric Process for sealing vacuum-tight spinel bodies
US3239323A (en) * 1961-06-28 1966-03-08 Gen Electric Method for sealing ceramics
US3298083A (en) * 1964-01-02 1967-01-17 Rca Corp Method of making electron gun mount
US3376376A (en) * 1964-06-16 1968-04-02 Corning Glass Works Miniature transistor enclosed in a glass disc-shaped housing

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