Granted Patent
Utility
US 4,725,571 · App. 07/006,398
Presulfiding composition for preparing hydrotreating catalyst activity and process for presulfiding a hydrotreating catalyst
Inventor:
William J. Tuszynski
Patented Case
View Patent ↗
Granted: Feb 16, 1988
Filed: Jan 23, 1987
Inventor
William J. Tuszynski
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.