Granted Patent
Utility
US 4,316,005 · App. 06/162,275
Cationic adsorption agent
Inventors:
Rudolf F. Wurster, Jurg Merz
Patented Case
View Patent ↗
Granted: Feb 16, 1982
Filed: Jun 23, 1980
Inventors
Rudolf F. Wurster
Jurg Merz
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.