Granted Patent
Utility
US 6,139,633 · App. 09/254,087
Single crystal pulling apparatus
Inventor:
Kiyofumi Nishiura
Patented Case
View Patent ↗
Granted: Oct 31, 2000
Filed: Mar 1, 1999
Inventor
Kiyofumi Nishiura
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.