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:
Jun. 24, 2003
Filed:
Mar. 22, 2001
Applicant:
Inventor:
Alfred Alig, Geiselbach-Omersbach, DE;
Assignee:
Degussa AG, Düsseldorf, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B 1/722 ; C01B 1/738 ;
U.S. Cl.
CPC ...
C01B 1/722 ; C01B 1/738 ;
Abstract
A method of preparing anhydrous sodium sulfide having an Na S content of at least 98 wt %, by drying hydrous sodium sulfide having a water content of 35 to 45%, provided as a solid or in liquefied form, by intensively kneading and mixing hydrated sodium sulfide at an elevated temperature and pressure to thereby liquify said hydrated sodium sulfide and obtain the anhydrous sodium sulfide.