Granted Patent
Utility
US 4,952,991 · App. 07/397,232
Vertical field-effect transistor having a high breakdown voltage and a small on-resistance
Inventor:
Chizuru Kayama
Patented Case
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Granted: Aug 28, 1990
Filed: Aug 23, 1989
Inventor
Chizuru Kayama
Assignee (at issue)
NEC 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.