Invention Grant
- Patent Title: Dry erasable projection article and system
- Patent Title (中): 干式可擦式投影物品和系统
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Application No.: US12684565Application Date: 2010-01-08
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Publication No.: US08220932B2Publication Date: 2012-07-17
- Inventor: Yufeng Liu , Encai Hao , David T. Yust , Lan H. Liu , Frederick J. Gustafson , Willem V. Bastiaens , Yu Yang
- Applicant: Yufeng Liu , Encai Hao , David T. Yust , Lan H. Liu , Frederick J. Gustafson , Willem V. Bastiaens , Yu Yang
- Applicant Address: US MN St. Paul
- Assignee: 3M Innovative Properties Company
- Current Assignee: 3M Innovative Properties Company
- Current Assignee Address: US MN St. Paul
- Agent Robert H. Jordan
- Main IPC: G03B21/26
- IPC: G03B21/26 ; G03B21/28 ; G03B21/56 ; G03B21/60 ; G02B27/14 ; G02F1/1335 ; H01K1/26 ; F21V9/14 ; B43L1/00
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.
Public/Granted literature
- US20100171929A1 DRY ERASABLE PROJECTION ARTICLE AND SYSTEM Public/Granted day:2010-07-08
Information query
