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:
Jul. 12, 2005
Filed:
Feb. 22, 2001
Richard John Pokorny, Maplewood, MN (US);
Marc Dudley Radcliffe, Newport, MN (US);
Philip Edwin Watson, Maplewood, MN (US);
Christopher Chadwick Bowley, Woodbury, MN (US);
Ikuko Ebihara, St. Paul, MN (US);
Richard John Pokorny, Maplewood, MN (US);
Marc Dudley Radcliffe, Newport, MN (US);
Philip Edwin Watson, Maplewood, MN (US);
Christopher Chadwick Bowley, Woodbury, MN (US);
Ikuko Ebihara, St. Paul, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
An optical body includes a substrate and a cholesteric liquid crystal layer disposed on the substrate. The cholesteric liquid crystal layer has a non-uniform pitch along a thickness direction of the layer and comprises a crosslinked polymer material that substantially fixes the cholesteric liquid crystal layer. The crosslinking hinders diffusion of cholesteric liquid crystal material within the cholesteric liquid crystal layer. In other methods of making an optical body, a reservoir of chiral material is provided during the process over a first cholesteric liquid crystal layer to diffuse into the layer and provide a non-uniform pitch. Alternatively, two coating compositions can be disposed on a substrate where the material of the first coating composition is not substantially soluble in the second coating composition.