Granted Patent
Utility
US 6,380,586 · App. 09/498,928
Trench-type insulated gate bipolar transistor
Inventor:
Koh Yoshikawa
Patented Case
View Patent ↗
Granted: Apr 30, 2002
Filed: Feb 4, 2000
Inventor
Koh Yoshikawa
Assignee (at issue)
FUJI ELECTRIC CO., LTD.
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.