Granted Patent
Utility
US 6,712,908 · App. 10/243,503
Purified silicon production system
Inventors:
Tihu Wang, Theodore F. Ciszek
Patented Case
View Patent ↗
Granted: Mar 30, 2004
Filed: Sep 13, 2002
Inventors
Tihu Wang
Theodore F. Ciszek
Assignee (at issue)
Midwest Research Institute, Inc.
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.