GB405466A - - Google Patents
Info
- Publication number
- GB405466A GB405466A GB5233/33A GB523333A GB405466A GB 405466 A GB405466 A GB 405466A GB 5233/33 A GB5233/33 A GB 5233/33A GB 523333 A GB523333 A GB 523333A GB 405466 A GB405466 A GB 405466A
- Authority
- GB
- United Kingdom
- Prior art keywords
- barium
- azide
- gms
- coating
- carbonate
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Discharge Lamp (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
405,466. Thermionic cathodes. WESTINGHOUSE ELECTRIC & MANUFACTURING CO., East Pittsburg, U.S.A.- (Assignees of Millis, W. T. ; 7720, Tuscarora Street, Wilkinsburg, Pennsylvania, U.S.A.) Feb. 20, 1933, No. 5233. Convention date, March 24, 1932. Drawings to Specification. [Class 39 (i).] The cathode body is coated with borium oxide mixed with compounds of barium or strontium or calcium or mixtures thereof and the coating is dried at a low temperature, mounted in a vacuum-tight container and heated to reduce the azide to free metallic barium. In an example, 25 gms. of barium carbonate and 25 gms. of strontium carbonate are mixed with 10 gms. of barium azide and the mixture is bound by nitro-cellulose dissolved in 75 c.c. of amyl acetate. The percentage of azide in the coating may vary from 0.5 to 85 of the mixture. Calcium carbonate may be added or may replace the strontium carbonate. The coating is dried at room temperature or at 100‹ C. The cathode is then mounted in the tube which is subjected to the usual high vacuum treatment, decomposing the carbonates into oxides and the azide to metallic barium. Curves showing the remission compared with standard cathodes at different wattages are given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US600366A US1966211A (en) | 1932-03-24 | 1932-03-24 | Cathode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB405466A true GB405466A (en) | 1934-02-08 |
Family
ID=32508278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5233/33A Expired GB405466A (en) | 1932-03-24 | 1933-02-20 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1966211A (en) |
| BE (1) | BE395224A (en) |
| FR (1) | FR753113A (en) |
| GB (1) | GB405466A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2464702A (en) * | 1944-11-04 | 1949-03-15 | Hartford Nat Bank & Trust Co | Process for manufacturing cathodes for electron discharge tubes |
| US2840751A (en) * | 1953-05-28 | 1958-06-24 | Westinghouse Electric Corp | Electrode coating composition and electrode for cold cathode gas discharge lamp |
-
0
- BE BE395224D patent/BE395224A/xx unknown
-
1932
- 1932-03-24 US US600366A patent/US1966211A/en not_active Expired - Lifetime
-
1933
- 1933-02-20 GB GB5233/33A patent/GB405466A/en not_active Expired
- 1933-03-24 FR FR753113D patent/FR753113A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR753113A (en) | 1933-10-07 |
| BE395224A (en) | |
| US1966211A (en) | 1934-07-10 |
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