Granted Patent
Utility
US 4,609,620 · App. 06/721,348
Pyrazolone compounds and a process for their manufacture
Inventors:
Stephen Postle, William E. Long
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Apr 9, 1985
Inventors
Stephen Postle
William E. Long
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.