Method for the preparation of pure carboxyethyl germanium sesquioxide
US5919964A · kind A · utility
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8Claims
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Key dates
| Filing date | Nov 24, 1997 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Nov 24, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F7/30
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention provides a method for synthesizing pure carboxyethyl germanium sesquioxide that does not include any toxic impurities, such as germanium dioxide or metallic germanium. Neither of these toxic compounds is used as a starting material. The method involves steps which ensure the full reaction of germanium tetrachloride in order to ensure that none is available to form germanium dioxide and steps which ensure the removal of any germanium dioxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.