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:
Nov. 03, 1998
Filed:
Feb. 25, 1997
Applicant:
Inventor:
Gerhard Keunecke, Pulheim, DE;
Assignee:
Zimmer Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08B / ;
U.S. Cl.
CPC ...
536 30 ; 536 32 ; 536 38 ;
Abstract
The invention comprises a process for producing cellulose carbamate with improved solubility properties comprising converting cellulose with urea in an inert, liquid, organic reaction carrier, at reaction temperature in the range of 80.degree. to 180.degree. C. where the reaction temperature is increased as the reaction time increases.