Process for preparation of water-free oxide material
US4462974A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1983 |
| Grant date | Jul 31, 1984 |
| Priority date | — |
| Expiry date | Apr 4, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F17/271
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The specification discloses new and improved processes for forming water-free metal or non-metal oxide materials, which may then be melted and formed into optical components in vitreous or crystal form, which are free of the hydrogen-impurity absorption in the near infrared wavelength range. In one process a water-free oxide is prepared by reacting a chosen organic compound containing oxygen bonded to an atom of the metal or non-metal, with a chosen organic acid anhydride to form an intermediate product which is then decomposed to form the desired oxide and to simultaneously regenerate the organic acid anhydride. The regenerated organic acid anhydride reacts with and removes traces of water and water-derived impurities during the formation of the desired oxide and prevents the inclusion of these impurities in the oxide as formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.