Self-masking transparency viewing apparatus
US5890305A · kind A · utility
5Cited by
41References
65Claims
0Family size
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Key dates
| Filing date | May 15, 1997 |
| Grant date | Apr 6, 1999 |
| Priority date | — |
| Expiry date | May 15, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/024
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A viewing apparatus for transparencies or the like masks any display areas not covered by transparencies by generating masks without moving parts, and adapts the luminance level of the image under study and of other display areas to the optimal viewing conditions required by the observer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.