Granted Patent
Utility
US 4,859,792 · App. 07/168,564
Accelerated preparation of esters
Inventors:
Thomas M. Powanda, Robert H. Imes, George L. Collins
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Mar 7, 1988
Inventors
Thomas M. Powanda
Robert H. Imes
George L. Collins
Assignee (at issue)
Hoechst Celanese 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.