Granted Patent
Utility
US 6,539,705 · App. 10/141,682
Method for monitoring and exhaust-gas catalytic converter of an internal combustion engine
Inventors:
Johannes Beer, Hong Zhang
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: May 8, 2002
Inventors
Johannes Beer
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.