Granted Patent
Utility
US 4,430,253 · App. 06/348,026
Sulfide-modified ruthenium catalyst
Inventors:
Michael Dubeck, Gordon G. Knapp
Patented Case
View Patent ↗
Granted: Feb 7, 1984
Filed: Feb 11, 1982
Inventors
Michael Dubeck
Gordon G. Knapp
Assignee (at issue)
Ethyl 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.