Granted Patent
Utility
US 6,368,403 · App. 09/512,947
Method and apparatus for purifying silicon
Inventors:
Frederick Schmid, Chandra P. Khattak, David B. Joyce
Patented Case
View Patent ↗
Granted: Apr 9, 2002
Filed: Feb 25, 2000
Inventors
Frederick Schmid
Chandra P. Khattak
David B. Joyce
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.