US1701849A - Electric discharge tube - Google Patents
Electric discharge tube Download PDFInfo
- Publication number
- US1701849A US1701849A US654481A US65448123A US1701849A US 1701849 A US1701849 A US 1701849A US 654481 A US654481 A US 654481A US 65448123 A US65448123 A US 65448123A US 1701849 A US1701849 A US 1701849A
- Authority
- US
- United States
- Prior art keywords
- cathode
- electric discharge
- hafnium
- discharge tube
- tubes
- 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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
- Y10T428/12812—Diverse refractory group metal-base components: alternative to or next to each other
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
- Y10T428/12826—Group VIB metal-base component
- Y10T428/1284—W-base component
Definitions
- the present invention relates to electric discharge-tubes, more particularly it relates to discharge-tubes being provided with an incandescent cathode.
- incandescent cathodes of discharge-tubes are at least at their surface made of hafnium, i. e. the element the atomic number of which is 7 2.
- Hafnium is highly refractory and has a low constant of Richardson.
- the said metal has consequently the advantage that at a. temperature at which the speedof volatilization is exceedingly small it has a very high emission of electrons.
- Discharge-tubes with glowcathodes accordin r to the invention are quite suitable for use as -ray tubes, rectifiers, receivingand generating tubes or amplifiers for wireless telcgraphy and telephony and other purposes.
- the accompanying drawing shows a discharge-tube with three electrodes, viz an incandescent cathode, an anode and a grid, such as are generally applied as receivers or amplifiers for wireless telegraphy, telephony or other purposes.
- a closed envelope 1 which may consist of glass or the like is provided with a stem 9 supporting the electrodes.
- the electrodes are concentrically arranged within each other.
- the anode 2 consisting for example of nickel, is shaped as a nearly closed cylinder and is supported by its current-lead 5.
- the grid 3 consists of a coiled 654,481, and in France February 21, 1923.
- the incandescent cathode, 4 is a wire stretched between current-leads 7 and 8.
- the current-leads 5, 6, 7 and 8 are hermetically sealed into the stem 9.
- the envelope 1 may be highly evacuated in any known manner.
- the incandescent cathode 4 may consist of hafnium. It may also consist of acore of a suitable refractory material, having a covering of hafnium; the core may consist for example of tungsten.
- R 1 An electrode for an electric discharge tube comprising a cathode containing hafmum.
- An electric discharge tube comprising a cathode thesurface of which contains hafmum.
- a cathode adapted to emit electrons, said cathode comprising a core of conducting refractory material and a coating of hafnlum.
- An electron "emitting cathode comprising a filamentary conductor containing hafnium.
- An electron emitting cathode comprising a filamentary conductor the surface of which contains hafnium.
- An electron emitting cathode comprising a filamentary conductor having a coating of hafnium.
- An electron emitting cathode comprising a core of tungsten coated with a film of hafnium.
- a cathode for electron-discharge devices having the element hafnium as a constituent thereof.
Landscapes
- Discharge Lamp (AREA)
- Electron Sources, Ion Sources (AREA)
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR423178X | 1923-02-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1701849A true US1701849A (en) | 1929-02-12 |
Family
ID=8898679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US654481A Expired - Lifetime US1701849A (en) | 1923-02-21 | 1923-07-28 | Electric discharge tube |
Country Status (5)
Country | Link |
---|---|
US (1) | US1701849A (fr) |
DE (1) | DE423178C (fr) |
FR (1) | FR573663A (fr) |
GB (1) | GB211825A (fr) |
NL (1) | NL13930C (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3174063A (en) * | 1960-04-27 | 1965-03-16 | Gen Electric | Compatible electrode system in vacuum thermionic apparatus |
-
0
- NL NL13930D patent/NL13930C/xx active
-
1923
- 1923-02-21 FR FR573663D patent/FR573663A/fr not_active Expired
- 1923-06-24 DE DEN22223D patent/DE423178C/de not_active Expired
- 1923-07-28 US US654481A patent/US1701849A/en not_active Expired - Lifetime
- 1923-08-08 GB GB20240/23A patent/GB211825A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3174063A (en) * | 1960-04-27 | 1965-03-16 | Gen Electric | Compatible electrode system in vacuum thermionic apparatus |
Also Published As
Publication number | Publication date |
---|---|
NL13930C (fr) | |
GB211825A (en) | 1924-05-01 |
FR573663A (fr) | 1924-06-27 |
DE423178C (de) | 1925-12-21 |
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