Granted Patent
Utility
US 5,445,679 · App. 07/996,037
Cleaning of polycrystalline silicon for charging into a Czochralski growing process
Inventors:
Richard L. Hansen, Mohsen Banan
Patented Case
View Patent ↗
Granted: Aug 29, 1995
Filed: Dec 23, 1992
Inventors
Richard L. Hansen
Mohsen Banan
Assignee (at issue)
MEMC Electronic Materials, 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.