Granted Patent
Utility
US 5,993,539 · App. 09/019,982
Method for pulling a single crystal
Inventor:
Teruo Izumi
Patented Case
View Patent ↗
Granted: Nov 30, 1999
Filed: Feb 6, 1998
Inventor
Teruo Izumi
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.