The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2012
Filed:
Jan. 08, 2010
Yufeng Liu, Woodbury, MN (US);
Encai Hao, Woodbury, MN (US);
David T. Yust, Woodbury, MN (US);
Lan H. Liu, Rosemount, MN (US);
Frederick J. Gustafson, Bloomington, MN (US);
Willem V. Bastiaens, Medina, MN (US);
Yu Yang, Eden Prairie, MN (US);
Yufeng Liu, Woodbury, MN (US);
Encai Hao, Woodbury, MN (US);
David T. Yust, Woodbury, MN (US);
Lan H. Liu, Rosemount, MN (US);
Frederick J. Gustafson, Bloomington, MN (US);
Willem V. Bastiaens, Medina, MN (US);
Yu Yang, Eden Prairie, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
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 A, and in a second direction orthogonal to the first direction with a second viewing angle A. The ratio A/Ais at least about 2.