Ligand-modified filter and methods for reducing metals from liquid compositions
US11465104B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Jan 31, 2020 |
| Grant date | Oct 11, 2022 |
| Priority date | — |
| Expiry date | Jan 31, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/346
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Described are filter materials including a polyol ligand, such as n-methylglucamine, and/or a polyphosphonic acid ligand, which are highly effective for filtering metals or metal ions from fluids. The filter materials can be particularly useful to filter basic and acidic 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.