Fluorescent lamps having reduced interference colors
US5258689A · kind A · utility
18Cited by
9References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1991 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Dec 11, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Fluorescent lamps having a tin oxide layer protected by a layer of colloidal alumina having a median particle diameter below 0.4 micron exhibit an objectionable pearlescent coloration if the alumina layer thickness is within the range of 500-8,000 .ANG.. This coloration is reduced to an acceptable level by incorporating from 10-30 wt. % of particulate alumina having a median diameter above 0.75 micron in the colloidal alumina.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.