Granted Patent
Utility
US 4,957,847 · App. 07/278,989
Heat-sensitive cyclic diazo compound containing recording material with benzotriazine compound and coupling component
Inventors:
Jean-Marie Adam, Hans-Peter Baumann
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Dec 2, 1988
Inventors
Jean-Marie Adam
Hans-Peter Baumann
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.