Granted Patent
Utility
US 5,628,186 · App. 08/551,791
Method and apparatus for controlled introduction of a reducing agent into a nitrogen oxide-containing exhaust gas
Inventor:
Helmut Schmelz
Patented Case
View Patent ↗
Granted: May 13, 1997
Filed: Nov 7, 1995
Inventor
Helmut Schmelz
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.