Granted Patent
Utility
US 4,288,450 · App. 06/110,077
Process for the preparation of novel benzopyrane derivatives
Inventors:
Georges Haas, Alberto Rossi, Knut A. Jaeggi, Alex Sele
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: Jan 7, 1980
Inventors
Georges Haas
Alberto Rossi
Knut A. Jaeggi
Alex Sele
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.