Granted Patent
Utility
US 6,399,998 · App. 09/675,401
High voltage insulated-gate bipolar switch
Inventor:
Hsueh-Rong Chang
Patented Case
View Patent ↗
Granted: Jun 4, 2002
Filed: Sep 29, 2000
Inventor
Hsueh-Rong Chang
Assignee (at issue)
Rockwell Technologies, 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.