Secondary-emissive layers
US4099079A · kind A · utility
17Cited by
12References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1975 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Dec 11, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A substrate bearing a secondary-emissive layer which consists of a cermet consisting of a readily evaporable metal, for example Au, Ag, Cu, Ni, Cr, Al or a nickel-chromium alloy, and an alkali metal aluminium fluoride, for example cryolite. The substrate material may be, for example mild steel, or a synthetic plastics material. It is possible to make large dynodes when using mild steel substrates which are much cheaper than silver-magnesium or beryllium-copper and the secondary-emissive layer does not require an activation treatment when incorporated in an electric discharge tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.