The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 2004
Filed:
Apr. 26, 2002
Applicant:
Inventors:
Aron Vecht, London NW 11 7DL, GB;
Dominic Andrew Davies, West Wickham, Kent BR4 OEG, GB;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G 1/12 ; C01G 9/08 ; C01G 1/102 ; C01G 1/300 ;
U.S. Cl.
CPC ...
C01G 1/12 ; C01G 9/08 ; C01G 1/102 ; C01G 1/300 ;
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.