Granted Patent
Utility
US 4,881,959 · App. 07/221,091
Exhaust emission purifier for diesel engines
Inventors:
Yoichiro Kono, Yasuaki Kumagai, Nobuaki Takeda, Hiroshi Ogita
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Jul 19, 1988
Inventors
Yoichiro Kono
Yasuaki Kumagai
Nobuaki Takeda
Hiroshi Ogita
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.