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:
Feb. 08, 2011
Filed:
Dec. 04, 2008
Applicants:
Kristina M. Magnusson, Gagnef, SE;
Kenneth Jarefors, Gagnef, SE;
Per-olav Dahlin, Borlange, SE;
Inventors:
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F 1/1347 (2006.01); G02F 1/1335 (2006.01);
U.S. Cl.
CPC ...
Abstract
A protective automatic darkening filter constructionincludes two low twist liquid crystal cellsinterspersed between a series of offset polarizers. The resulting construction provides improved homogeneity in the dark state as viewed by the user over a large viewing angle. By reducing variations in shade, visibility through the filter may be improved.