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:
Jan. 14, 1992
Filed:
Sep. 11, 1989
Friedrich Bittner, Bad Soden, DE;
Walter Hinrichs, Bruehl, DE;
Herbert Hovestadt, deceased, late of Erftstadt, DE;
Ludwig Lange, Bruehl, DE;
Erich Splett, Huerth-Berrenrath, DE;
Degussa Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Methods for the preparation of lower sodium polysulfides such as sodium disulfide from higher sodium polysulfides and sodium. To this end, either molten sodium polysulfide placed in a receiver is reacted with sodium in a stoichiometric ratio corresponding to the desired product under vigorous agitation and under protective gas or the higher polysulfide and the sodium are dosed into a polysulfide melt in a receiver under the same conditions either alternatively or simultaneously. In all instances, the dosing of the sodium is set so that the reaction mixture remains capable of being agitated and the agitation is continued until the desired product composition has been achieved.