Granted Patent
Utility
US 6,337,062 · App. 09/512,456
Method for the production of anhydrous alkali metal sulfide and alkali metal sulfide solution
Inventor:
Iwao Akiba
Patented Case
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Granted: Jan 8, 2002
Filed: Feb 24, 2000
Inventor
Iwao Akiba
Assignees (at issue)
Idemitsu Petrochemical Co., Ltd.
PETROLEUM ENERGY CENTER
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.