Electron emitting element
US5189341A · kind A · utility
30Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 1991 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | May 16, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/3042
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron emitting element capable of preventing pollution of the emitter due to absorption of gas thereon, to thereby ensure stable emission of electrons over a long period of time even in a low vacuum atmosphere. The electron emitting element is constructed so as to permit a part of electrons emitted from one of emitters to impinge on the other of the emitters being ready for emission to clean it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.