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:
Dec. 02, 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;
SOCIÉTÉ 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 an aqueous gel ink with fixed color comprising the following steps: (i) preparing a gel-based matrix of aqueous ink; (ii) preparing an aqueous suspension of silver nanoparticles with fixed color by mixing silver salts with: —water, —a mixture of at least an alkali metal or alkaline earth metal salt of citrate, preferably an alkali citrate salt and an alkali metal hydride, preferably NaBH4, —a further reducing agent, preferably ascorbic acid, —and oxidizing agent, preferably hydrogen peroxide HO(iii) adding under agitation the aqueous suspension of silver nanoparticles obtained in step (ii) to the gel-based matrix of aqueous ink obtained in step (i), to obtain an aqueous gel ink with fixed color with silver nanoparticles dispersed therein.