Fluorescent lamps having improved maintenance and method of making same
US4459507A · kind A · utility
18Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1982 |
| Grant date | Jul 10, 1984 |
| Priority date | — |
| Expiry date | Feb 18, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/35
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Lumen maintenance of fluorescent lamps is improved by applying over the phosphor of the lamps a vapor deposited film of yttrium oxide having a purity of 99.99%. The vapor is generated by electron beam bombardment of an yttrium oxide target and the film is most efficacious when applied to a thickness of from about 120 to about 600 angstroms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.