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:
Dec. 29, 2015
Filed:
Aug. 23, 2011
David G. Freier, Saint Paul, MN (US);
Rolf W. Biernath, Wyoming, MN (US);
Thomas R. Hoffend, Jr., Woodbury, MN (US);
David G. Freier, Saint Paul, MN (US);
Rolf W. Biernath, Wyoming, MN (US);
Thomas R. Hoffend, Jr., Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
The disclosure generally relates to switchable light extractors and in particular to switchable light extractors useful for extracting light from light ducts used for interior lighting of a building. The disclosure also relates to lighting systems that include the light extractors, and methods of extracting light from a lighting system. The switchable light extractors generally include a first and a second reflective film, each having a plurality of voids that can aligned to extract light from a light duct.