Granted Patent
Utility
US 5,010,192 · App. 07/406,338
Pyridazinone manufacture
Inventors:
Michael Yelland, John Kelshaw Conway
Patented Case
View Patent ↗
Granted: Apr 23, 1991
Filed: Sep 13, 1989
Inventors
Michael Yelland
John Kelshaw Conway
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.