发明授权
US07166420B2 Protection of transient documents using a photochromic protective layer 有权
使用光致变色保护层保护瞬态文件

Protection of transient documents using a photochromic protective layer
摘要:
A protective, switchable layer adapted for use in transient imageable documents is disclosed. The protective layer can be disposed on an underlying photochromic layer and enables writing or imaging the underlying layer. The protective layer prevents unintentional writing on the photochromic layer, such as can otherwise occur from exposure to certain wavelengths of light.
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