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. 28, 2010
Filed:
Dec. 18, 2006
Katsuhiko Heki, Hino, JP;
Katsuhiko Heki, Hino, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
An optical film producing method, comprises steps of: extruding a melted material including a melted cellulose ester resin from a casting die by using an extruding device; forming a film by pressing the extruded melted material between a first rotating member and a second rotating member; and winding up the formed film, wherein the following formulas are satisfied: 30° C.≦T1−T2≦60° C., 0° C.≦T2−T3≦20° C., Tg<T3, where T1 is the temperature of the melted material at an exit of the casting die, T2 is the temperature of the film at a point where the film firstly contacts the first rotating member, T3 is the temperature of the film at a point where the film is pressed between the first rotating member and the second rotating member, and Tg is the glass transition temperature of the film.