Granted Patent
Utility
US 5,874,608 · App. 08/858,357
Process for the preparation of esters of aromatic carboxylic acid
Inventors:
Ralf Pfirmann, Theodor Papenfuhs
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: May 19, 1997
Inventors
Ralf Pfirmann
Theodor Papenfuhs
Assignee (at issue)
Hoechst GmbH
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.