Granted Patent
Utility
US 4,407,976 · App. 06/271,882
Anionic adsorbent
Inventors:
Jurg Merz, Hans Wegmuller, Rudolf F. Wurster
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Jun 9, 1981
Inventors
Jurg Merz
Hans Wegmuller
Rudolf F. Wurster
Assignee (at issue)
Ciba-Geigy
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.