Granted Patent
Utility
US 5,276,161 · App. 07/582,292
Process for the preparation of benzotriazoles
Inventors:
Helmut Prestel, Rudolf Maul
Patented Case
View Patent ↗
Granted: Jan 4, 1994
Filed: Sep 13, 1990
Inventors
Helmut Prestel
Rudolf Maul
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.