Controlled-porosity dispenser cathode
US4101800A · kind A · utility
20Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1977 |
| Grant date | Jul 18, 1978 |
| Priority date | — |
| Expiry date | Jul 6, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An emissive member for a controlled-porosity, dispenser-type cathode comping a three-component sandwich consisting of: (1) a supporting disc; (2) a layer of nonsintered alkaline earth material on said disc; and (3) a thin perforated foil on said layer. The foil is made of refractory metal and has a uniform pattern of tiny holes through which the active material of the reservoir migrates to coat the surface of the foil, the foil thus serving as the electron-emitting surface of the cathode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.