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. 30, 2013
Filed:
Dec. 16, 2008
Kenton D. Budd, Woodbury, MN (US);
Matthew H. Frey, Cottage Grove, MN (US);
Christopher K. Haas, St. Paul, MN (US);
Vivek Krishnan, St. Paul, MN (US);
Kenton D. Budd, Woodbury, MN (US);
Matthew H. Frey, Cottage Grove, MN (US);
Christopher K. Haas, St. Paul, MN (US);
Vivek Krishnan, St. Paul, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Retroreflective elements and articles that include such elements. The retroreflective elements () include a solid spherical core () having an outer surface. A first complete concentric optical interference layer () overlays the outer surface of the core providing a first interface between the core and the first optical interference layer, and a second complete concentric optical interference layer () overlays the first optical interference layer to provide a second interface between the first optical interference layer and the second optical interference layer. In some embodiments, a third complete concentric optical interference layer overlays the second optical interference layer to provide a third interface between the second optical interference layer and the third optical interference layer. The retroreflective articles include a substrate having a first major surface and a second major surface with a plurality of the retroreflective elements affixed along the first major surface of the substrate.