Granted Patent
Utility
US 5,032,888 · App. 07/555,770
Conductivity modulation buried gate trench type MOSFET
Inventor:
Yasukazu Seki
Patented Case
View Patent ↗
Granted: Jul 16, 1991
Filed: Jul 23, 1990
Inventor
Yasukazu Seki
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.