Granted Patent
Utility
US 5,045,521 · App. 07/402,619
Catalyst for the purification of exhaust gases of internal combustion engines with reduction of hydrogen sulfide emission
Inventors:
Egbert Lox, Edgar Koberstein, Bernd Engler
Patented Case
View Patent ↗
Granted: Sep 3, 1991
Filed: Sep 5, 1989
Inventors
Egbert Lox
Edgar Koberstein
Bernd Engler
Assignee (at issue)
Degussa AG
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.