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:
Jan. 21, 2025
Filed:
Aug. 28, 2020
Societe Bic, Clichy, FR;
Universite DE Haute Alsace, Mulhouse, FR;
Centre National DE LA Recherche Scientifique, Paris, FR;
Olivier Albenge, Clichy, FR;
Romain Metillon, Clichy, FR;
Karine Mougin, Paris, FR;
Feriel Ghellal, Clichy, FR;
Arnaud Spangenberg, Mulhouse, FR;
SOCIETE BIC, Clichy, FR;
UNIVERSITÉ DE HAUTE-ALSACE, Mulhouse, FR;
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris, FR;
Abstract
The present invention concerns a process for preparing in situ an aqueous gel ink with variable color comprising the following steps: (i) preparing a gel-based matrix of aqueous ink comprising 0.005 to 0.1 mol·Lof ester(s) of retinol represented by formula (I), and (ii) adding a solution of 0.002 to 0.05 mol·Lsilver salts (Ag) to the gel-based matrix of aqueous ink prepared in step (i), to obtain an aqueous gel ink with variable color with silver nanoparticles dispersed therein. The present invention also relates to an aqueous gel ink with variable color obtained according to the process of the invention, comprising said ester of retinol represented by formula (I) and silver nanoparticles. The invention finally concerns a writing instrument comprising an aqueous gel ink with variable color according to the invention.