Granted Patent
Utility
US 4,238,455 · App. 06/038,261
Denitrification reactor
Inventor:
Toshiaki Ogiwara
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: May 11, 1979
Inventor
Toshiaki Ogiwara
Assignee (at issue)
Ishikawajima-Harima Jukogyo 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.