Granted Patent
Utility
US 4,288,610 · App. 06/123,879
Purification of pyrethroid intermediate compounds by selective partial saponification
Inventor:
Edmund J. Rumanowski
Patented Case
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Granted: Sep 8, 1981
Filed: Feb 25, 1980
Inventor
Edmund J. Rumanowski
Assignee (at issue)
Stauffer Chemical 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.