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:
Nov. 04, 2003
Filed:
Feb. 06, 2001
Applicant:
Inventors:
Michael F. Weber, Shoreview, MN (US);
David L. Wortman, St. Paul, MN (US);
Andrew J. Ouderkirk, Woodbury, MN (US);
Sanford Cobb, Jr., St. Mary's Point, MN (US);
Assignee:
3M Innovative Properties Company, Saint Paul, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 7/02 ; G02B 2/700 ; G02B 2/710 ; G02B 2/728 ;
U.S. Cl.
CPC ...
B32B 7/02 ; G02B 2/700 ; G02B 2/710 ; G02B 2/728 ;
Abstract
Optical devices such as light pipes which incorporate multilayer optical films in which the refractive indices of two adjacent layers in the thickness direction are substantially matched or are small relative to the difference in refractive indices of said two adjacent layers in an given in-plane direction which is at least 0.05. The multilayer optical film exhibits low absorptivity and can reflect light approaching at shallow angles as well as normal to the film.