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:
May. 31, 2022
Filed:
Sep. 27, 2018
Applicant:
Sumitomo Bakelite Co., Ltd., Shinagawa-ku, JP;
Inventors:
Takuya Oyama, Shinagawa-ku, JP;
Tetsuya Ishikawa, Shinagawa-ku, JP;
Assignee:
SUMITOMO BAKELITE CO., LTD., Shinagawa-ku, JP;
Primary Examiner:
Int. Cl.
CPC ...
B32B 27/36 (2006.01); B32B 27/30 (2006.01); G02B 1/04 (2006.01); G02B 5/22 (2006.01);
U.S. Cl.
CPC ...
B32B 27/365 (2013.01); B32B 27/306 (2013.01); G02B 1/04 (2013.01); G02B 5/223 (2013.01); B32B 2307/4026 (2013.01); B32B 2307/42 (2013.01); B32B 2307/71 (2013.01); B32B 2551/00 (2013.01); Y10T 428/31507 (2015.04);
Abstract
An optical sheet of the present invention includes a specific wavelength absorption layer that contains a polycarbonate as a main material and a light absorbing agent that absorbs light of a specific wavelength out of light in a wavelength range of 350 nm to 740 nm, in which the polycarbonate has a viscosity average molecular weight Mv of 20,000 to 30,000. In addition, the specific wavelength absorption layer further includes an ultraviolet absorbing agent that absorbs light in a wavelength range of 100 nm to 420 nm.