Granted Patent
Utility
US 4,347,180 · App. 06/222,808
High caustic coupling process for preparing substituted 2-nitro-2'-hydroxyazobenzenes
Inventors:
Roland A. E. Winter, Martin Dexter
Patented Case
View Patent ↗
Granted: Aug 31, 1982
Filed: Jan 5, 1981
Inventors
Roland A. E. Winter
Martin Dexter
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.