Granted Patent
Utility
US 4,634,779 · App. 06/430,413
Cyanogenation of benzopyrones and naphthopyrones
Inventor:
Peter Mockli
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: Sep 30, 1982
Inventor
Peter Mockli
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.