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:
Sep. 30, 2003
Filed:
Oct. 11, 2000
Susan L. Kent, Shorewood, MN (US);
Ronald J. Tabar, St. Paul, MN (US);
Richard C. Allen, Lilydale, MN (US);
Elisa M. Cross, Woodbury, MN (US);
William Ward Merrill, White Bear Lake, MN (US);
Stephen A. Johnson, Woodbury, MN (US);
Peter D. Condo, Lake Elmo, MN (US);
Timothy J. Hebrink, Oakdale, MN (US);
Joseph A. Gangi, St. Paul, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
An improved optical film having a continuous/disperse phase morphology and a method for making the same is provided. At least one of the continuous and disperse phases comprises a blend of homopolymers which are inter-reacted, as by transesterification. The resulting films exhibit a higher degree of birefringence for a given level of strain than analogous films in which the blend is replaced by a random copolymer.