Granted Patent
Utility
US 4,962,199 · App. 07/473,140
Pyridazines by magnesium halide catalyzed cyclization
Inventor:
Gopi Yalamanchili
Patented Case
View Patent ↗
Granted: Oct 9, 1990
Filed: Feb 1, 1990
Inventor
Gopi Yalamanchili
Assignee (at issue)
Monsanto Company
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.