Granted Patent
Utility
US 4,563,335 · App. 06/563,613
Apparatus for continuously concentrating and denitrating nitrate solution by microwave
Inventors:
Hideo Akiyama, Akio Todokoro, Osamu Takanobu
Patented Case
View Patent ↗
Granted: Jan 7, 1986
Filed: Dec 20, 1983
Inventors
Hideo Akiyama
Akio Todokoro
Osamu Takanobu
Assignee (at issue)
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.