Granted Patent
Utility
US 5,254,720 · App. 07/996,948
Process for preparing aryl-substituted aliphatic carboxylic acids and their alkyl esters
Inventor:
Tse-Chong Wu
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Dec 28, 1992
Inventor
Tse-Chong Wu
Assignee (at issue)
Ethyl Corporation
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.