Sharpening metal carbide emitters
US7828622B1 · kind B1 · utility
3Cited by
0References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2007 |
| Grant date | Nov 9, 2010 |
| Priority date | — |
| Expiry date | May 14, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/042
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for sharpening a metal carbide emitter tip is disclosed. The metal carbide emitter tip is exposed to an oxygen rich, low vacuum environment when the metal carbide emitter tip is at a first temperature. The metal carbide emitter tip is rapidly heated to a higher second temperature at regular intervals of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.