Granted Patent
Utility
US 4,935,540 · App. 07/283,098
Process for the preparation of aryloxyacetic acid
Inventor:
Charles Sumner
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Dec 12, 1988
Inventor
Charles Sumner
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.