Patent · US Expired

Preparation of sulphides

US6733739B2 · kind B2 · utility

1Cited by
6References
8Claims
0Family size

Inventors

Key dates

Filing dateApr 26, 2002
Grant dateMay 11, 2004
Priority date—
Expiry dateMay 25, 2022

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC01P2006/60
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

Sulphides are prepared by combining a dithionite compound with an aqueous alkaline solution of an appropriate cation or mixture of cations. On heating the corresponding sulphides are precipitated. The dithionite compound may be a dithionite dianion which is produced as an intermediary when thiourea dioxide is used as a starting material in the solution. Examples of appropriate cations are zinc (as zinc acetate) and copper (as copper acetate). The precipitate is dried and subsequently fired to produce high quality sulphides which may be used as phosphors or other optoelectronic materials.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.