Method of making cathode heaters
US4126489A · kind A · utility
7Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1975 |
| Grant date | Nov 21, 1978 |
| Priority date | — |
| Expiry date | Jul 21, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of improving the thermal emmissivity of a cathode heater wire to allow lower temperature operation of the heater without an attendant lowering in the cathode operating temperature, in which method the surface of a tungsten or molybdenum wire is oxidized, then coated with a salt of a refractory metal, and finally heated to reduce the salt and oxide to their metallic forms thereby causing the heater wire to be roughened and darkened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.