Granted Patent
Utility
US 5,496,920 · App. 08/250,133
Increasing the molecular weight of polyamides
Inventors:
Rudolf Pfaendner, Kurt Hoffmann, Heinz Herbst
Patented Case
View Patent ↗
Granted: Mar 5, 1996
Filed: May 27, 1994
Inventors
Rudolf Pfaendner
Kurt Hoffmann
Heinz Herbst
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.