Granted Patent
Utility
US 6,233,921 · App. 09/381,923
Method for reducing harmful exhaust gas emissions of a spark-ignition engine operating with a lean fuel/air mixture
Inventors:
Christian Enderle, Andreas Hertzberg, Klaus Roessler
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Jan 14, 2000
Inventors
Christian Enderle
Andreas Hertzberg
Klaus Roessler
Assignee (at issue)
Daimlerchrysler 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.