DE1089483B - Process for the manufacture of a cathode for an electrical discharge tube - Google Patents
Process for the manufacture of a cathode for an electrical discharge tubeInfo
- Publication number
- DE1089483B DE1089483B DEN6805A DEN0006805A DE1089483B DE 1089483 B DE1089483 B DE 1089483B DE N6805 A DEN6805 A DE N6805A DE N0006805 A DEN0006805 A DE N0006805A DE 1089483 B DE1089483 B DE 1089483B
- Authority
- DE
- Germany
- Prior art keywords
- cathode
- alkaline earth
- porous
- molybdenum
- tube
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000000034 method Methods 0.000 title claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 229910052750 molybdenum Inorganic materials 0.000 claims description 11
- 239000011733 molybdenum Substances 0.000 claims description 11
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 229910052721 tungsten Inorganic materials 0.000 claims description 8
- 239000010937 tungsten Substances 0.000 claims description 8
- 150000001341 alkaline earth metal compounds Chemical class 0.000 claims description 6
- 229910052735 hafnium Inorganic materials 0.000 claims description 4
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 239000010955 niobium Substances 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052715 tantalum Inorganic materials 0.000 claims description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 3
- 240000002989 Euphorbia neriifolia Species 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052790 beryllium Inorganic materials 0.000 claims description 3
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims 1
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000003870 refractory metal Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- 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
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
- H01J9/042—Manufacture, activation of the emissive part
- H01J9/047—Cathodes having impregnated bodies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/14—Solid thermionic cathodes characterised by the material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/28—Dispenser-type cathodes, e.g. L-cathode
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
- Solid Thermionic Cathode (AREA)
- Discharge Lamp (AREA)
Description
Die Erfindung· bezieht sich äüi ein Verfahren zur Herstellung einer Kathode für eine elektrische Entladungsröhre, die im Innern mit einem Vorrat an Erdalkalimetallverbindungen, die aus Mischungen von Erdalkalioxyden mit einem oder mehreren der Oxyde von Silicium, Aluminium, Beryllium, Bor und Thor bestehen, versehen ist und deren für die Emission bestimmte Oberfläche aus einem der porösen, hochschmelzenden Metalle Wolfram, Molybdän, Tantal, Hafnium oder Niob gebildet ist und bei der die Vorratsstoffmischungen geschmolzen sind.The invention relates to a method for Manufacture of a cathode for an electric discharge tube, which is inside with a supply Alkaline earth metal compounds consisting of mixtures of alkaline earth oxides with one or more of the oxides of silicon, aluminum, beryllium, boron and thor are provided and their intended for emission Surface made of one of the porous, refractory metals tungsten, molybdenum, tantalum, Hafnium or niobium is formed and in which the stock mixtures are melted.
Im Hauptpatent ist angegeben, daß die Kathoden dadurch hergestellt werden sollen, daß Pulver der g'eschmolzenen Vorratsstoffmischung gemischt wird mit Pulver des hochschmelzenden Metalls und daß dieses Gemisch anschließend gepreßt und gesintert wird. Die Sintertemperatur kann im Hinblick auf die Verdampfung der Vorratsstoffe nur ziemlich niedrig gewählt werden, weil die Sinterung doch viele Minuten dauern muß, um einen guten Zusammenhang zu err halten. Die niedrige Sintertemperatur bewirkt aber, daß das Kathodengebilde noch ziemlich locker ist, was eine geringe mechanische Festigkeit und eine große Verdampfungsgeschwindigkeit der Vorratsstoffe mit sich bringt. Auch macht das Pressen die Herstellung verwickelter Kathodenformen schwierig.The main patent states that the cathodes are to be produced by mixing powder of the molten storage material mixture with powder of the high-melting metal and that this mixture is then pressed and sintered. The sintering temperature can only be selected fairly low in relation to the evaporation of the stock materials because the sintering but must take many minutes, holding r to a good connection to it. However, the low sintering temperature has the effect that the cathode structure is still quite loose, which results in low mechanical strength and a high rate of evaporation of the stored materials. Pressing also makes intricate cathode shapes difficult to manufacture.
Die Erfindung bezweckt, diese Nachteile zu vermeiden. The invention aims to avoid these disadvantages.
Bei einem Verfahren zur Herstellung einer Kathode für eine elektrische Entladungsröhre, die im Innern mit einem Vorrat an Erdalkalimetallverbindungen, die aus Mischungen von Erdalkalioxyden mit einem oder mehreren der Oxyde von Silicium, Aluminium, Beryllium, Bor und Thor bestehen, versehen ist und deren für die Emission bestimmte Oberfläche aus einem der porösen, hochschmelzenden Metalle Wolfram, Molybdän, Tantal, Hafnium oder Niob gebildet ist und bei der die Vorratsstoffmischungen geschmolzen sind, nach Patent 973 193, wird gemäß der Erfindung der poröse Kathodenkörper mit den geschmolzenen Erdalkalimetallverbindungen durchtränkt.In a method of making a cathode for an electric discharge tube, which is internally with a supply of alkaline earth metal compounds, the from mixtures of alkaline earth oxides with one or more of the oxides of silicon, aluminum, beryllium, Boron and Thor are made, and their surface intended for emission is made of one of the porous, refractory metals tungsten, molybdenum, tantalum, hafnium or niobium is formed and at which the stock mixtures are melted, according to patent 973 193, is according to the invention of porous cathode bodies with the molten alkaline earth metal compounds soaked.
Durch dieses Verfahren wird ein Kathodenkörper mit großer Festigkeit erhalten, da es möglich ist, vorher den porösen Kathodenkörper sehr hoch zu sintern, wodurch eine große Festigkeit entsteht; ferner können die verschiedensten Kathodenformen hergestellt werden, und darüber hinaus ist zufolge der geringen Porosität auch die Verdampfung gering.By this method, a cathode body with great strength is obtained, since it is possible to sinter the porous cathode body very high beforehand, which results in great strength; further A wide variety of cathode shapes can be produced, and in addition is due to the low Porosity also low evaporation.
Da die Kathode keine abgeschlossene Vorratskammer zu enthalten braucht, kann sie durchaus beliebig gestaltet sein. Der poröse, hochschmelzende Metallkörper, z. B. aus Wolfram, kann z. B. auch mit Kupfer durchtränkt und durch Schneiden nach Wunsch gestaltet sein.Since the cathode does not need to contain a closed storage chamber, it can be of any size be designed. The porous, refractory metal body, e.g. B. made of tungsten, z. B. also with Impregnated with copper and shaped as desired by cutting.
Verfahren zur HerstellungMethod of manufacture
einer Kathode für eine elektrischea cathode for an electrical
EntladungsröhreDischarge tube
Zusatz zum Patent 973 193Addendum to patent 973 193
Anmelder:Applicant:
N. V. Philips' Gloeilampenfabrieken,
Eindhoven (Niederlande)NV Philips' Gloeilampenfabrieken,
Eindhoven (Netherlands)
Vertreter: Dr. rer. nat. P. Roßbach, Patentanwalt,
Hamburg 1, Möncfcebergstr. 7Representative: Dr. rer. nat. P. Roßbach, patent attorney,
Hamburg 1, Möncfcebergstr. 7th
Beanspruchte Priorität:
V. St. v. Amerika vom 27. Februar 1952Claimed priority:
V. St. v. America February 27, 1952
Roberto Levi, New York, N. Y.,Roberto Levi, New York, N.Y.,
und Ray Collier Hughes, Ardsley, N. Y. (V. St. A.),and Ray Collier Hughes, Ardsley, N.Y. (V. St. A.),
sind als Erfinder genannt wordenhave been named as inventors
Es ist jedoch auch möglich, das mit einem niedrigschmelzenden Füllmetall durchtränkte hochschmelzende Metall durch Hämmern, Plätten oder Ziehen so zu formen, daß band- oder drahtförmige Kathoden erhalten werden können. Die Poren des porösen Metallkörpers werden vorzugsweise in einer neutralen Atmosphäre oder im Vakuum mit den Erdalkaliverbindungen durchtränkt. Die neutrale Atmosphäre wird im allgemeinen von einem nicht verunreinigten Edelgas gebildet werden, obgleich auch Stickstoff, gegebenenfalls mit einer geringen Wasserstoffmenge, verwendbar sein kann. Die Poren können ausgefüllt werden, indem der poröse Metallkörper in die geschmolzene Masse getaucht oder indem die zu schmelzende Masse in angemessener Menge auf den porösen Metallkörper gebracht wird und das Tränken dann durch Heizen erfolgt. Die porösen Metallkörper können aus Wolfram, Molybdän, Hafnium, Tantal, Niob oder Rhenium bestehen. However, it is also possible to use the high-melting point impregnated with a low-melting filler metal To shape metal by hammering, flattening or drawing in such a way that band-shaped or wire-shaped cathodes can be obtained. The pores of the metal porous body are preferably in a neutral Atmosphere or in a vacuum with the alkaline earth compounds. The neutral atmosphere is in the generally formed by an uncontaminated noble gas, although nitrogen, if appropriate with a small amount of hydrogen, may be usable. The pores can be filled, by immersing the porous metal body in the molten mass or by adding the mass to be melted is applied in an appropriate amount on the metal porous body, and then impregnated by heating he follows. The porous metal bodies can consist of tungsten, molybdenum, hafnium, tantalum, niobium or rhenium.
Die Erfindung wird an Hand der Zeichnung näher erläutert, in derThe invention is explained in more detail with reference to the drawing, in which
Fig. 1 eine Kathode mit flacher Emissionsoberfläche und1 shows a cathode with a flat emission surface and
Fig. 2 eine Kathode mit zylindrischer Emissionsoberfläche zeigt. Fig. 2 shows a cathode with a cylindrical emission surface.
009 608/266009 608/266
In Fig. 1 bezeichnet 1 ein Molybdänröhrchen, das auf der oberen Seite durch eine gesinterte Wolframscheibe 2 verschlossen ist, die mit einem geschmolzenen Gemisch aus Bariumoxyd und Aluminiumoxyd in einem Molekularverhältnis von 5 :2 durchtränkt ist. Die untere Seite 4 der Wolframscheibe 2 ist derart bearbeitet, daß die Poren zum Verhüten von Emission und Verdampfung auf der unteren Seite geschlossen sind. Die untere Seite der Scheibe 2 kann auch durch eine Molybdänplatte abgedeckt werden, die nach dem Tränken angebracht wird. Obgleich der Tränkvorgang vor dem Befestigen der Scheibe 2 in der Büchse 1 durchgeführt werden kann, hat folgendes Verfahren Vorteile: Die Büchse mit der in ihr befestigten Scheibe 2 wird mit der offenen Seite aufwärts gewendet in einem Molybdäntiegel mit Deckel in einen Ofen eingeführt. Die Büchse 1 enthält die gewünschte Menge an Erdalkalimetallverbindungen. Nach dem Entlüften wird mittels Hochfrequenzerhitzung die Temperatur des Molybdäntiegels in etwa 5 Sekunden auf einen Wert von etwa 1600 bis 1700° C gesteigert; diese Temperatur wird während etwa 5 Sekunden bis einer Minute aufrechterhalten. Nach Abkühlen kann der Heizfaden und gegebenenfalls die Molybdänverschlußplatte montiert werden. Bei einer Kathodentemperatur von 1000° C ergeben sich Emissionen von 1 bis 2 A/cm2. Es können Lebensdauern von 1000 Stunden erreicht werden.In Fig. 1, 1 denotes a molybdenum tube which is closed on the upper side by a sintered tungsten disk 2 which is impregnated with a molten mixture of barium oxide and aluminum oxide in a molecular ratio of 5: 2. The lower side 4 of the tungsten disk 2 is machined in such a way that the pores are closed to prevent emission and evaporation on the lower side. The lower side of the disc 2 can also be covered by a molybdenum plate which is attached after the impregnation. Although the impregnation process can be performed prior to securing the disc 2 in the sleeve 1, has the following processing advantages: Cartridges with the attached in their disc 2 is upwardly ge with the open side turns in a molybdenum crucible with a lid in a furnace introduced. The can 1 contains the desired amount of alkaline earth metal compounds. After venting, the temperature of the molybdenum crucible is increased to a value of about 1600 to 1700 ° C in about 5 seconds by means of high-frequency heating; this temperature is maintained for about 5 seconds to a minute. After cooling, the filament and, if necessary, the molybdenum sealing plate can be installed. At a cathode temperature of 1000 ° C, emissions of 1 to 2 A / cm 2 result . Lifetimes of 1000 hours can be achieved.
Nach Fig. 2 besteht die Kathode aus einem gesinterten Wolframröhrchen 5., das mit einem geschmolzenen Gemisch aus Bariumoxyd, Aluminiumoxyd und Boroxyd durchtränkt ist; dieses Gemisch enthält mindestens 60 Gewichtsprozent Bariumoxyd; das VerAccording to Fig. 2, the cathode consists of a sintered tungsten tube 5, which is melted with a Mixture of barium oxide, aluminum oxide and boron oxide is impregnated; this mixture contains at least 60 percent by weight of barium oxide; the Ver
hältnis zwischen den anderen Oxyden ist verhältnismäßig beliebig. Das Röhrchen 5 hat Molybdänverschlußplatten 6, durch die die Zuführungsdrähte für den Heizfaden 7 hindurchragen. Die Poren des Röhrchens 5 sind gleichfalls auf der Innenseite abgeschlossen. The ratio between the other oxides is relatively arbitrary. The tube 5 has molybdenum sealing plates 6, through which the lead wires for the filament 7 protrude. The pores of the Tubes 5 are also closed on the inside.
Claims (2)
Schweizerische Patentschrift Nr. 159 791.Considered publications:
Swiss patent specification No. 159 791.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US273607A US2700000A (en) | 1952-02-27 | 1952-02-27 | Thermionic cathode and method of manufacturing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1089483B true DE1089483B (en) | 1960-09-22 |
Family
ID=23044673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEN6805A Pending DE1089483B (en) | 1952-02-27 | 1953-02-25 | Process for the manufacture of a cathode for an electrical discharge tube |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US2700000A (en) |
| BE (1) | BE517981A (en) |
| CH (1) | CH318053A (en) |
| DE (1) | DE1089483B (en) |
| ES (2) | ES207960A1 (en) |
| FR (1) | FR1077589A (en) |
| GB (1) | GB734311A (en) |
| IT (1) | IT500079A (en) |
| NL (1) | NL96177C (en) |
Families Citing this family (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE531122A (en) * | 1953-08-14 | |||
| NL97571C (en) * | 1953-11-18 | |||
| US2813807A (en) * | 1954-07-19 | 1957-11-19 | Philips Corp | Method of making a dispenser cathode |
| US3041209A (en) * | 1955-06-28 | 1962-06-26 | Gen Electric | Method of making a thermionic cathode |
| BE559450A (en) * | 1956-07-24 | |||
| BE561832A (en) * | 1956-10-24 | |||
| BE563664A (en) * | 1957-01-03 | |||
| US3075066A (en) * | 1957-12-03 | 1963-01-22 | Union Carbide Corp | Article of manufacture and method of making same |
| US2975320A (en) * | 1958-12-03 | 1961-03-14 | Rca Corp | Low-temperature plasma source |
| US3076916A (en) * | 1959-01-21 | 1963-02-05 | Semicon Associates Inc | Impregnated tungsten cathode structures and methods for fabricating same |
| US2995674A (en) * | 1959-02-27 | 1961-08-08 | Raytheon Co | Impregnated cathodes |
| US3155864A (en) * | 1960-03-21 | 1964-11-03 | Gen Electric | Dispenser cathode |
| NL266639A (en) * | 1960-07-05 | |||
| US3160780A (en) * | 1961-01-17 | 1964-12-08 | Philips Corp | Indirectly heated cathode |
| US3258636A (en) * | 1961-09-01 | 1966-06-28 | Electron emitter with activator of sill cide, boride or carbide of solid solu- tion of barium and at least one other alkaline earth metal | |
| NL6515843A (en) * | 1965-12-07 | 1967-06-08 | ||
| NL6602973A (en) * | 1966-03-08 | 1967-09-11 | ||
| US3514324A (en) * | 1967-05-01 | 1970-05-26 | Kopco Ind | Tungsten coating of dispenser cathode |
| US3538570A (en) * | 1968-02-28 | 1970-11-10 | Otto G Koppius | Thermionic dispenser cathode |
| US4097762A (en) * | 1975-08-14 | 1978-06-27 | International Telephone & Telegraph Corporation | Xenon arc discharge lamp having a particular electrode composition and wherein the arc discharge is obtained without heating the electrode |
| US4636749A (en) * | 1979-08-13 | 1987-01-13 | Brunswick Corporation | Pulsed magnetron tube having improved electron emitter assembly |
| US4377505A (en) * | 1980-12-29 | 1983-03-22 | General Electric Company | Electrical resistor and fabrication thereof |
| FR2514945A1 (en) * | 1981-10-20 | 1983-04-22 | Thomson Csf | Indirectly heated cathode e.g. for CRT - where thin tube made of refractory metal is used to carry pastille impregnated with emitter material, esp. barium scandate |
| WO1985002071A1 (en) * | 1983-11-02 | 1985-05-09 | Brunswick Corporation | Tuning apparatus for a radio frequency power device |
| US4675570A (en) * | 1984-04-02 | 1987-06-23 | Varian Associates, Inc. | Tungsten-iridium impregnated cathode |
| US5418070A (en) * | 1988-04-28 | 1995-05-23 | Varian Associates, Inc. | Tri-layer impregnated cathode |
| KR920003185B1 (en) * | 1990-01-31 | 1992-04-23 | 삼성전관 주식회사 | Dispensor cathode and the manufacturing method of the same |
| JP2985467B2 (en) * | 1992-01-22 | 1999-11-29 | 三菱電機株式会社 | Method for producing impregnated cathode |
| DE19652822A1 (en) * | 1996-12-18 | 1998-06-25 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Sintered electrode |
| US20090284124A1 (en) * | 2008-04-22 | 2009-11-19 | Wolfgang Kutschera | Cathode composed of materials with different electron works functions |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH159791A (en) * | 1931-02-14 | 1933-01-31 | Aeg | Hot cathode for electrical discharge vessels. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL15389C (en) * | 1923-01-12 | |||
| US2389060A (en) * | 1943-08-13 | 1945-11-13 | Callite Tungsten Corp | Refractory body of high electronic emission |
| US2547869A (en) * | 1947-10-31 | 1951-04-03 | Sylvania Electric Prod | Fluorescent lamp electrode |
-
0
- BE BE517981D patent/BE517981A/xx unknown
- NL NL96177D patent/NL96177C/xx active
- IT IT500079D patent/IT500079A/it unknown
-
1952
- 1952-02-27 US US273607A patent/US2700000A/en not_active Expired - Lifetime
-
1953
- 1953-02-24 ES ES0207960A patent/ES207960A1/en not_active Expired
- 1953-02-25 CH CH318053D patent/CH318053A/en unknown
- 1953-02-25 GB GB5269/53A patent/GB734311A/en not_active Expired
- 1953-02-25 FR FR1077589D patent/FR1077589A/en not_active Expired
- 1953-02-25 DE DEN6805A patent/DE1089483B/en active Pending
- 1953-06-01 ES ES0209589A patent/ES209589A1/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH159791A (en) * | 1931-02-14 | 1933-01-31 | Aeg | Hot cathode for electrical discharge vessels. |
Also Published As
| Publication number | Publication date |
|---|---|
| US2700000A (en) | 1955-01-18 |
| GB734311A (en) | 1955-07-27 |
| ES209589A1 (en) | 1953-07-16 |
| ES207960A1 (en) | 1953-07-16 |
| CH318053A (en) | 1956-12-15 |
| BE517981A (en) | |
| NL96177C (en) | |
| FR1077589A (en) | 1954-11-09 |
| IT500079A (en) |
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