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. 20, 2009
Filed:
Jun. 23, 2005
Jehuda Greener, Rochester, NY (US);
James F. Elman, Fairport, NY (US);
Yuanqiao Rao, Pittsford, NY (US);
Jon A. Hammerschmidt, Rochester, NY (US);
David B. Bailey, Webster, NY (US);
Jehuda Greener, Rochester, NY (US);
James F. Elman, Fairport, NY (US);
YuanQiao Rao, Pittsford, NY (US);
Jon A. Hammerschmidt, Rochester, NY (US);
David B. Bailey, Webster, NY (US);
Nitto Denko Corporation, Osaka, JP;
Abstract
A multilayer compensator includes one or more polymeric first layers and one or more polymeric second layers. The first layers comprise a polymer having an out-of-plane birefringence between −0.005 and +0.005. The second layers comprise an amorphous polymer having an out-of-plane birefringence that is either less than −0.005 or greater than +0.005. The overall in-plane retardation of the multilayer compensator is greater than 20 nm, and the out-of-plane retardation is more negative than −20 nm or more positive than +20 nm. The amorphous polymer of the second layer(s) has a glass transition temperature (Tg) such that 110° C.≦Tg≦180° C. when the Rof the multilayer compensator is more negative than −20 nm, and 100° C.≦Tg≦160° C. when the Rof the multilayer compensator is more positive than +20 nm.