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:
Nov. 27, 2018
Filed:
Aug. 07, 2014
Applicant:
Sumitomo Chemical Company, Limited, Chuo-ku, Tokyo, JP;
Inventors:
Nobuyuki Hatanaka, Osaka, JP;
Akira Yokota, Osaka, JP;
Tadahiro Kobayashi, Osaka, JP;
Mitsutaka Sase, Niihama, JP;
Yoshifumi Komatsu, Niihama, JP;
Assignee:
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/30 (2006.01); G02F 1/1335 (2006.01);
U.S. Cl.
CPC ...
G02B 5/3083 (2013.01); G02B 5/305 (2013.01); G02B 5/3016 (2013.01); G02F 2001/133541 (2013.01);
Abstract
To provide an optical film excellent in suppression of light leakage in black display. An optical film having at least two phase difference layers and having optical properties represented by the formulae (30) and (31) is provided:−2.0≤*≤0.5  (30)−0.5≤*≤5.0  (31)wherein, a* and b* represent the chromatic coordinate in the L*a*b* color system.