High purity amino-organosulfonic acid zwitterionic compositions
US6774261B2 · kind B2 · utility
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19Claims
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Assignee
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Key dates
| Filing date | Aug 29, 2002 |
| Grant date | Aug 10, 2004 |
| Priority date | — |
| Expiry date | Aug 29, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates to high purity hydrogen ion buffers and in particular amino-organosulfonic acid zwitterionic compositions having low metal content. The concentration of any single metal in the composition is no greater than about 500 ppb, and ideally is less than about 20 ppb.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.