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:
Dec. 29, 1998
Filed:
Feb. 26, 1997
Applicant:
Inventors:
Hans-Gunther Breidohr, Wuppertal, DE;
Michael Pelger, Wuppertal, DE;
Panajotis Argyriadis, Wuppertal, DE;
Assignee:
Akzo Nobel NV, Arnhem, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29B / ; B01D / ; B01D / ;
U.S. Cl.
CPC ...
264345 ; 21050023 ; 21050029 ; 2105003 ; 21050031 ; 2643 / ; 2643 / ;
Abstract
Properties of cellulosic membranes such as the length and the ultrafiltration rate are stabilized by warmth/humidity conditioning, whereby temperatures in a range of about 30.degree. to 60.degree. C. and relative humidities in a range of about 10 to 60% are suitable. The membranes may be enveloped at a relative humidity of about 40 to 60% and at about 20.degree. to 25.degree. C. in a packaging which is at least substantially impermeable to the passage of moisture before being subjected to the conditioning.