Granted Patent
Utility
US 5,221,723 · App. 07/864,146
Thermally stable bisimido copolymerizates
Inventor:
Rene Arpin
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Apr 6, 1992
Inventor
Rene Arpin
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.