Granted Patent
Utility
US 6,497,752 · App. 09/868,593
Integrally asymmetrical polyolefin membrane
Inventors:
Erich Kessler, Thomas Batzilla, Friedbert Wechs, Frank Wiese
Patented Case
View Patent ↗
Granted: Dec 24, 2002
Filed: Aug 24, 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.