Patent No. EP3727599 (titled "Composition For Dyeing Keratin Fibers Containing A Combination Of A P-Phenylene Derivative And 2,7-Naphthalenediol And Use Thereof For Reducing A Yellow Tinge In A Hairstyle") was filed by Laboratoire Biosthetique Kosmetik on Dec 21, 2017. The application was issued on Nov 22, 2023.

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