Granted Patent
Utility
US 4,429,110 · App. 06/387,119
Transparent polyamide from branched chain arylalkyl diamine
Inventor:
Josef Pfeifer
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Jun 10, 1982
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.