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. 12, 2026
Filed:
Mar. 15, 2022
The Hong Kong University of Science and Technology, Hong Kong, CN;
Valerii Vladimirovich Vashchenko, Hong Kong, CN;
Olena Vashchenko, Hong Kong, CN;
Hoi Sing Kwok, Hong Kong, CN;
Cuiling Meng, Huizhou, CN;
Yeuk Lung Ho, Hong Kong, CN;
The Hong Kong University of Science and Technology, Hong Kong, CN;
Abstract
A dichroic bis-azo biphenyl dye of the following formula: The substituents R, R, R, Rare alkyl (CH) or alkenyl (CH) groups with n=1-18. At least one substituent among RRRRis different from the other substituents. A benzidine-free method of making a dichroic bis-azo biphenyl dye is provided in which the biphenyl portion of the dye is formed from different first and second mono-azo dyes by a cross-coupling reaction, which may be a Suzuki reaction. A polarizer is formed from a photoaligned layer of the bis-azo biphenyl dye on a substrate and exhibits a dichroic ratio of at least 40. Chemical modification of the photoaligned bis-azo biphenyl dye layer creates a broad-band thin film polarizer with low light scattering and high thermal and photo tolerances.