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. 09, 1999
Filed:
Nov. 28, 1997
Applicant:
Inventors:
Rebecca Klotzer, Hamburg, DE;
Bernd Seibig, Geesthacht, DE;
Dieter Paul, Kleinmachnow, DE;
Klaus-Viktor Peinemann, Geesthacht, DE;
Assignee:
GKSS-Forschungszentrum Geesthacht GmbH, Geesthacht, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D01D / ;
U.S. Cl.
CPC ...
264 41 ; 264 51 ; 2642093 ; 2642095 ; 264235 ; 264563 ;
Abstract
In a method of producing hollow fiber membranes, wherein a molten polymer charged with a gas under pressure is provided in an extrusion apparatus, the polymer melt including the gas under pressure is extruded from the extrusion apparatus through a hollow fiber-forming extrusion nozzle with a predetermined pressure drop which provides for a concurrent expansion of the gas contained in the polymer melt thereby forming a porous hollow fiber membrane.