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:
Feb. 23, 1993
Filed:
Jul. 16, 1991
Peter Hinterholzer, Timelkam, AT;
Stefan Zikeli, Regau, AT;
Heinrich Firgo, Vocklabruck, AT;
Bernd Wolschner, Vocklabruck, AT;
Dieter Eichinger, Vocklabruck, AT;
Johann Manner, Weyregg/Attersee, AT;
Stephan Astegger, Vocklabruck, AT;
Karin Weinzierl, Timelkam, AT;
Lenzing Aktiengesellschaft, Lenzing, AT;
Abstract
A solution of cellulose in water and N-methylmorpholine-N-oxide (NMMO) containing 2 to 44% by weight cellulose is stabilized at 0.01 to 1%, preferably 0.1% H.sub.2 O.sub.2 and 0.01 to 2%, preferably 0.1% of an H.sub.2 O.sub.2 stabilizer, preferably oxalic acid or a salt thereof during formation of the solution and during heating to prevent discoloration of the cellulose and reduce the composition of NMMO.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile