Granted Patent
Utility
US 6,683,331 · App. 10/132,549
Trench IGBT
Inventors:
Richard Francis, Chiu Ng
Patented Case
View Patent ↗
Granted: Jan 27, 2004
Filed: Apr 25, 2002
Inventors
Richard Francis
Chiu Ng
Assignee (at issue)
International Rectifier 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.