Granted Patent
Utility
US 4,814,233 · App. 07/067,589
Material coated with polyamic acid ester
Inventor:
Josef Pfeifer
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Jun 29, 1987
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.