Granted Patent
Utility
US 4,617,375 · App. 06/755,382
Polyamide, from condensed cyclic dicarboxylic acid and branched chain diamine
Inventor:
Josef Pfeifer
Patented Case
View Patent ↗
Granted: Oct 14, 1986
Filed: Jul 16, 1985
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.