Granted Patent
Utility
US 4,837,376 · App. 07/104,657
Process for refining silicon and silicon purified thereby
Inventors:
Ingo Schwirtlich, Horst Lange, Werner Kannchen
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Oct 5, 1987
Inventors
Ingo Schwirtlich
Horst Lange
Werner Kannchen
Assignee (at issue)
Bayer Aktiengesellschaft
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.