Granted Patent
Utility
US 4,563,309 · App. 06/641,219
Production of carboxylic anhydrides from methyl carboxlyates using rhodium complex catalysts
Inventor:
Richard W. Wegman
Patented Case
View Patent ↗
Granted: Jan 7, 1986
Filed: Aug 16, 1984
Inventor
Richard W. Wegman
Assignee (at issue)
Union Carbide 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.