Granted Patent
Utility
US 4,239,740 · App. 06/042,474
Production of high purity silicon by a heterogeneous arc heater reduction
Inventors:
Francis J. Harvey, II, David F. Ciliberti, Thomas N. Meyer, Maurice G. Fey
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: May 25, 1979
Inventors
Francis J. Harvey, II
David F. Ciliberti
Thomas N. Meyer
Maurice G. Fey
Assignee (at issue)
Westinghouse Electric Company LLC
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.