Granted Patent
Utility
US 6,187,089 · App. 09/245,238
Tungsten doped crucible and method for preparing same
Inventors:
Richard J. Phillips, Steven Jack Keltner
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Feb 5, 1999
Inventors
Richard J. Phillips
Steven Jack Keltner
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.