Granted Patent
Utility
US 4,444,723 · App. 06/367,055
Denitration systems
Inventors:
Kenichi Matsumaru, Hirobumi Oshima, Masaaki Hirayama
Patented Case
View Patent ↗
Granted: Apr 24, 1984
Filed: Apr 9, 1982
Inventors
Kenichi Matsumaru
Hirobumi Oshima
Masaaki Hirayama
Assignees (at issue)
Tokyo Shibaura Denki Kabushiki Kaisha
Doryokuro Kakunenryo Kaihatsu Jigyodan
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.