Granted Patent
Utility
US 4,377,683 · App. 06/272,866
Transparent copolyamide from isophorone diamine and substituted undecane diamine
Inventors:
Josef Pfeifer, Dieter Reinehr
Patented Case
View Patent ↗
Granted: Mar 22, 1983
Filed: Jun 12, 1981
Inventors
Josef Pfeifer
Dieter Reinehr
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.