Fluorescent indicator tube and related circuit
US4217578A · kind A · utility
8Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1977 |
| Grant date | Aug 12, 1980 |
| Priority date | — |
| Expiry date | Dec 23, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J63/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fluorescent signal level indicator includes two parallel rows of anode electrodes coated with a layer of fluorescent material to emit light when energized in response to an input analog signal exceeding a corresponding one of graduated reference potentials. A cathode electrode is provided for emitting electrons toward the anodes and a grid electrode is mounted between the cathode and anode electrodes for controlling the amount of electrons passing therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.