GB700053A - Improvements in or relating to cathodes for electric discharge tubes - Google Patents
Improvements in or relating to cathodes for electric discharge tubesInfo
- Publication number
- GB700053A GB700053A GB2496/52A GB249652A GB700053A GB 700053 A GB700053 A GB 700053A GB 2496/52 A GB2496/52 A GB 2496/52A GB 249652 A GB249652 A GB 249652A GB 700053 A GB700053 A GB 700053A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plate
- cup
- polished
- discharge tubes
- pores
- 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
Links
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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Powder Metallurgy (AREA)
Abstract
700,053. Making catliodes for discharge tubes. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Jan. 30, 1952 [Feb. 2, 1951], No. 2496/52. Classes 83 (2) and 83 (4). [Also in Groups XXIII and XL(a)] Powder metallurgy.-In the manufacture of a cathode comprising a cup 3, having a recessed portion containing a supply of alkaline earth compounds 5, which is closed by a porous refractory-metal plate 1, the pores of the latter are loaded with a filling of a hard material, so that the plate may be polished without closing up the pores. The plate 1, of porous tungsten ,is sintered at 2200‹ C. and then buttwelded to the forced-in bottom 2 of the cup. The plate and cup are then soaked in a solution of polystyrene in acetone, dried and polished, assembled in the tube with the heating element 4, and heated to 400‹ C. to vaporize the polystyrene. In a modification the plate 1 is impregnated with molten copper and polished, after which the copper is removed by sulphuric acid or volatilization in a vacuum and the plate is then welded to the cup.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL298663X | 1951-02-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB700053A true GB700053A (en) | 1953-11-25 |
Family
ID=19783115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2496/52A Expired GB700053A (en) | 1951-02-02 | 1952-01-30 | Improvements in or relating to cathodes for electric discharge tubes |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE508873A (en) |
| CH (1) | CH298663A (en) |
| DE (1) | DE925367C (en) |
| FR (1) | FR1050051A (en) |
| GB (1) | GB700053A (en) |
| NL (1) | NL76950C (en) |
-
0
- BE BE508873D patent/BE508873A/xx unknown
- NL NL76950D patent/NL76950C/xx active
-
1952
- 1952-01-30 GB GB2496/52A patent/GB700053A/en not_active Expired
- 1952-01-30 DE DEN5025A patent/DE925367C/en not_active Expired
- 1952-01-31 CH CH298663D patent/CH298663A/en unknown
- 1952-01-31 FR FR1050051D patent/FR1050051A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE925367C (en) | 1955-03-21 |
| NL76950C (en) | |
| BE508873A (en) | |
| FR1050051A (en) | 1954-01-05 |
| CH298663A (en) | 1954-05-15 |
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