Granted Patent
Utility
US 4,725,569 · App. 06/675,165
Organopolysulfide-impregnated catalyst and methods of preparation and use
Inventors:
William J. Tuszynski, Dennis R. Stevens
Patented Case
View Patent ↗
Granted: Feb 16, 1988
Filed: Nov 27, 1984
Inventors
William J. Tuszynski
Dennis R. Stevens
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.