Granted Patent
Utility
US 5,152,867 · App. 07/554,552
Apparatus and method for producing silicon single crystal
Inventors:
Kiichiro Kitaura, Makoto Ito, Kaoru Kuramochi
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Jul 19, 1990
Inventors
Kiichiro Kitaura
Makoto Ito
Kaoru Kuramochi
Assignees (at issue)
OSAKA TITANIUM
Kyushu Electronic Metal 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.