Granted Patent
Utility
US 5,021,221 · App. 06/938,049
Apparatus for producing high purity silicon from flames of sodium and silicon tetrachloride
Inventors:
Robert K. Gould, Charles R. Dickson
Patented Case
View Patent ↗
Granted: Jun 4, 1991
Filed: Dec 4, 1986
Inventors
Robert K. Gould
Charles R. Dickson
Assignee (at issue)
Aerochem Research Labs, 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.