Process for preparing aqueous gel inks with variable color, and aqueous gel inks thereof
US11807762B2 · kind B2 · utility
0Cited by
4References
19Claims
0Family size
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Key dates
| Filing date | Nov 18, 2019 |
| Grant date | Nov 7, 2023 |
| Priority date | — |
| Expiry date | Nov 5, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/16
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
There is a process for preparing in situ an aqueous gel ink with variable color having the following steps: There also is an aqueous gel ink with variable color obtained according to the process of the disclosure, having a reducing agent, metallic nanoparticles and iron powder.There further is a writing instrument having an aqueous gel ink with variable color according to the disclosure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.