Granted Patent
Utility
US 6,667,349 · App. 09/673,090
Method for producing osmotically and mechanically stable gel-like anion exchangers
Inventors:
Holger Lutjens, Reinhold Klipper, Georg Martin, Alfred Mitschker, Michael Holzbrecher
Patented Case
View Patent ↗
Granted: Dec 23, 2003
Filed: Oct 11, 2000
Inventors
Holger Lutjens
Reinhold Klipper
Georg Martin
Alfred Mitschker
Michael Holzbrecher
Assignee (at issue)
Bayer Aktiengesellschaft
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.