Granted Patent
Utility
US 6,571,550 · App. 10/084,132
Method for adjusting the oxygen concentration in a three-way catalytic converter system
Inventors:
Gerd Rösel, Hong Zhang
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Feb 27, 2002
Inventors
Gerd Rösel
Hong Zhang
Assignee (at issue)
Siemens Aktiengesellschaft
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.