Granted Patent
Utility
US 6,340,427 · App. 09/516,020
Solution purification method for electrolyte
Inventors:
Atsushi Fukui, Kouji Ando, Masaki Imamura
Patented Case
View Patent ↗
Granted: Jan 22, 2002
Filed: Feb 29, 2000
Inventors
Atsushi Fukui
Kouji Ando
Masaki Imamura
Assignee (at issue)
SUMITOMO METAL MINING CO., LTD.
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.