Granted Patent
Utility
US 6,375,876 · App. 09/869,153
Method for producing an integrally asymmetrical polyolefin membrane
Inventors:
Erich Kessler, Thomas Batzilla, Friedbert Wechs, Frank Wiese
Patented Case
View Patent ↗
Granted: Apr 23, 2002
Filed: Sep 4, 2001
Inventors
Erich Kessler
Thomas Batzilla
Friedbert Wechs
Frank Wiese
Assignee (at issue)
Membrana GmbH
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.