Stable crystalline (6R) -tetrahydrofolic acid
US6596721B2 · kind B2 · utility
7Cited by
6References
16Claims
0Family size
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Key dates
| Filing date | Jan 8, 2001 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Jan 8, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P43/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Pure and extremely stable crystalline (6R)-tetrahydrofolic acids, absolutely inert even when exposed to air and elevated temperature without stabilizers being added, are prepared by a crystallization process at a pH of ≧2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.