Granted Patent
Utility
US 4,254,032 · App. 06/029,593
Carbazolylmethane compounds
Inventors:
Jean C. Petitpierre, Peter Burri
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Apr 12, 1979
Inventors
Jean C. Petitpierre
Peter Burri
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.