Granted Patent
Utility
US 4,629,777 · App. 06/608,755
Polyimides, a process for their preparation and their use
Inventor:
Josef Pfeifer
Patented Case
View Patent ↗
Granted: Dec 16, 1986
Filed: May 10, 1984
Inventor
Josef Pfeifer
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.