Granted Patent
Utility
US 6,644,021 · App. 10/303,605
Exhaust gas purifying apparatus of internal combustion engine
Inventors:
Kojiro Okada, Yasuki Tamura
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Nov 25, 2002
Inventors
Kojiro Okada
Yasuki Tamura
Assignee (at issue)
MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
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.