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:
Mar. 20, 1979
Filed:
Jul. 14, 1977
Richard L Crone, Woodbury, MN (US);
Robert L Elton, White Bear Lake, MN (US);
Minnesota Mining and Manufacturing Company, Saint Paul, MN (US);
Abstract
Low-profile raised retroreflective sheeting useful for retroreflecting light that strikes the sheeting at a high incidence angle comprises a base retroreflective layer and a light-directing layer disposed above the base retroreflective layer. The light-directing layer comprises a longitudinally-extending series of short transparent projections which each have upwardly extending front and back edge surfaces. The front edge surface is disposed across the path of high-incidence-angle light so as to transmit a high percentage of such light rays; and the back edge surface is disposed so as to reflect the light transmitted through the front edge surface to the retroreflective layer for retroreflection by the layer and to return light retroreflected by the retroreflection elements back through the front edge surface toward its source.