Method for enhancing electron emission from carbon-containing cathode
US5728435A · kind A · utility
4Cited by
18References
55Claims
0Family size
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Key dates
| Filing date | May 22, 1995 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | May 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2329/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode structure is formed by a process in which a carbon-containing electron-emissive cathode is subjected to electronegative atoms that include oxygen and/or fluorine. The cathode is also subjected to atoms of electropositive metal, typically after being subjected to the atoms of oxygen and/or fluorine. The combination of the electropositive metal atoms and the electronegative atoms enhances the electron emissivity by reducing the work function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.