Granted Patent
Utility
US 4,250,096 · App. 05/948,857
3- and 4-Azidophthalic acid derivatives
Inventors:
Vratislav Kvita, Hans Zweifel, Gerd Greber
Patented Case
View Patent ↗
Granted: Feb 10, 1981
Filed: Oct 5, 1978
Inventors
Vratislav Kvita
Hans Zweifel
Gerd Greber
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.