Dry erasable projection article and system
US8220932B2 · kind B2 · utility
3Cited by
36References
24Claims
0Family size
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Key dates
| Filing date | Jan 8, 2010 |
| Grant date | Jul 17, 2012 |
| Priority date | — |
| Expiry date | Jan 15, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/56
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A communication article and system comprising a writing member having a dry erasable front surface and a projection member is disclosed. The projection member includes an asymmetric optical diffuser that scatters light in a first direction with a first viewing angle AH, and in a second direction orthogonal to the first direction with a second viewing angle AV. The ratio AH/AV is at least about 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.