Granted Patent
Utility
US 6,337,219 · App. 09/381,685
Method of producing silicon single and single crystal silicon wafer
Inventor:
Hideshi Nishikawa
Patented Case
View Patent ↗
Granted: Jan 8, 2002
Filed: Dec 20, 1999
Inventor
Hideshi Nishikawa
Assignee (at issue)
SUMITOMO METAL INDUSTRIES, 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.