Ultraviolet light filter and filter system
US5204773A · kind A · utility
11Cited by
3References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1991 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Dec 19, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/208
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An ultraviolet light filter is provided by implanting an ultraviolet light absorbing chemical species into an ultraviolet light transmissive substrate. Two such filters having gradient distributions may be overlapped and shifted relative to each other to provide adjustable attenuation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.