Granted Patent
Utility
US 5,972,107 · App. 08/919,895
Method for purifying silicon
Inventors:
Frederick Schmid, Chandra P. Khattak
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Aug 28, 1997
Inventors
Frederick Schmid
Chandra P. Khattak
Assignee (at issue)
Crystal Systems Corporation
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.