Ligand-modified filter and methods for reducing metals from liquid compositions
US11772055B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | Feb 24, 2021 |
| Grant date | Oct 3, 2023 |
| Priority date | — |
| Expiry date | Jun 17, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2301/028
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Described are filter materials having polycarboxyl ligands, such as iminodiacetic acid, which are highly effective for filtering metals or metal ions from fluids. The filter materials can be particularly useful to filter various fluid compositions, such as those used for wet etching, removing photoresist, and cleaning steps in microelectronic device manufacturing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.