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:
Jan. 16, 2007
Filed:
Oct. 03, 2002
John C. Wright, Bucks, GB;
Michael C. Lea, Bracknell, GB;
John C. Wright, Bucks, GB;
Michael C. Lea, Bracknell, GB;
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A light-guide light () suitable for use in illuminated displays and signs comprises a housing () defining an optical cavity having first and second generally parallel major faces (), and a light source () positioned to direct light into the optical cavity from one side. The first major face () comprises a material (for example, a prismatic film) having coefficients of reflection and transmission that vary with the angle at which light is incident on the material. The second major face () comprises a narrow-scattering reflective material having a reflectance of at least 85%, for example a highly-efficient reflective material provided with a suitable textured pattern.