Granted Patent
Utility
US 4,727,231 · App. 06/910,644
Method and apparatus for denitration of nitrate solution by microwave heating
Inventors:
Noriyuki Hayano, Yoshimi Kawato, Tatushi Arishige, Hideaki Tamai, Shizuo Mine
Patented Case
View Patent ↗
Granted: Feb 23, 1988
Filed: Sep 23, 1986
Inventors
Noriyuki Hayano
Yoshimi Kawato
Tatushi Arishige
Hideaki Tamai
Shizuo Mine
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.