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:
Dec. 12, 2006
Filed:
Aug. 18, 2003
Satoshi Sakamaki, Kanagawa, JP;
Satoshi Sakamaki, Kanagawa, JP;
Fuji Photo Film, Co., Ltd, Kanagawa, JP;
Abstract
In order to produce a polarizing filter, first and second protective films are adhered to respective surfaces of a polarized film. When M, Mare determined as respective coefficients of expansion by water absorption of the first and second protective films, the coefficients of expansion satisfy a formula, 0.65·M<M<1.55·M. A difference of the thickness between the first and second protective films is more than 2 μm and less than 100 μm. Further, the first and second protective films are formed of cellulose triacetate, and the polarized film is formed of polyvinylalcohol series. Thus the polarizing filter has no curl to be formed after the protective films are adhered to the polarized film.