Granted Patent
Utility
US 4,316,621 · App. 06/192,382
Pressure-sensitive or heat-sensitive recording material
Inventor:
Jean C. Petitpierre
Patented Case
View Patent ↗
Granted: Feb 23, 1982
Filed: Sep 30, 1980
Inventor
Jean C. Petitpierre
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.