Granted Patent
Utility
US 5,969,175 · App. 08/874,727
Purification of nitrile
Inventors:
Kouzo Murao, Katsuo Ishii, Tetsuro Horinouchi
Patented Case
View Patent ↗
Granted: Oct 19, 1999
Filed: Jun 13, 1997
Inventors
Kouzo Murao
Katsuo Ishii
Tetsuro Horinouchi
Assignee (at issue)
MITSUBISHI ELECTRIC CORPORATION
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.