Granted Patent
Utility
US 4,485,245 · App. 06/437,724
Hydrogenation of carboxylic acid anhydrides to lactones or esters using a ruthenium trichlorostannate catalyst
Inventors:
Chao-Yang Hsu, James E. Lyons
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Oct 29, 1982
Inventors
Chao-Yang Hsu
James E. Lyons
Assignee (at issue)
SUN-TECH LIMITED
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.