Granted Patent
Utility
US 5,943,858 · App. 08/974,259
Premixing chamber for an exhaust gas purification system
Inventors:
Lothar Hofmann, Oliver Pfaff, Udo Klumpp, Wieland Mathes
Patented Case
View Patent ↗
Granted: Aug 31, 1999
Filed: Nov 19, 1997
Inventors
Lothar Hofmann
Oliver Pfaff
Udo Klumpp
Wieland Mathes
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.