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:
Aug. 28, 2001
Filed:
May. 09, 1997
Bettie C. Fong, Woodbury, MN (US);
Wade D. Kretman, St. Paul, MN (US);
Keith M. Kotchick, St. Paul, MN (US);
Sanford Cobb, Jr., St. Mary's Point, MN (US);
Richard A. Miller, Stillwater, MN (US);
Todd R. Williams, Lake Elmo, MN (US);
Kazuhiko Toyooka, Yamagata, JP;
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A brightness enhancement article that includes: (a) a transparent, flexible substrate; (b) a first major surface having an array of prisms with blunted or rounded peaks characterized by a chord width, cross-sectional pitch width, and radius of curvature in which the chord width is equal to about 20-40% of the cross-sectional pitch width and the radius of curvature is equal to about 20-50% of the cross-sectional pitch width; and (c) a second major surface characterized by a plurality of light scattering protrusions. The article has a haze value between about 20-60% and a transmission value no greater than about 94% when measured under conditions in which the first surface has a substantially planar topography.