Granted Patent
Utility
US 4,716,424 · App. 06/494,467
Pressure-sensitive or heat-sensitive recording material
Inventors:
Jean C. Petitpierre, Hermann Nachbur, Albert Wurmli
Patented Case
View Patent ↗
Granted: Dec 29, 1987
Filed: May 13, 1983
Inventors
Jean C. Petitpierre
Hermann Nachbur
Albert Wurmli
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.