Granted Patent
Utility
US 4,455,436 · App. 06/292,961
N-Acyl-o-phenylenediamines
Inventors:
Hans R. Meyer, Max Siegrist
Patented Case
View Patent ↗
Granted: Jun 19, 1984
Filed: Aug 14, 1981
Inventors
Hans R. Meyer
Max Siegrist
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.