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. 12, 1993
Filed:
Nov. 22, 1991
Applicant:
Inventors:
Stefan Astegger, Vocklabruck, AT;
Heinrich Firgo, Vocklabruck, AT;
Bernd Wolschner, Vocklabruck, AT;
Johann Manner, Weyregg/Attersee, AT;
Karin Weinzierl, Timelkam, AT;
Stefan Zikeli, Regau, AT;
Dieter Eichinger, Vocklabruck, AT;
Assignee:
Lenzing Aktiengesellschaft, Lenzing, AT;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210651 ; 210663 ; 210688 ; 210777 ;
Abstract
An aqueous N-methylmorpholine-N-oxide solution which was used as a spinning bath in the production of cellulosic products is regenerated by contacting it with active coal, silicon dioxide or alumina adsorbent and filtering, thereby reducing turbidity, eliminating nitrosoamine, decolorizing the solution and removing transition metals like iron therefrom.