Granted Patent
Utility
US 5,777,091 · App. 08/560,264
Phosphonomethylated chitosans
Inventors:
Martin Kuhn, Thomas Maier, Albert Stehlin
Patented Case
View Patent ↗
Granted: Jul 7, 1998
Filed: Nov 21, 1995
Inventors
Martin Kuhn
Thomas Maier
Albert Stehlin
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.