Granted Patent
Utility
US 4,458,286 · App. 06/413,206
Electronic device having a high voltage breakdown protection circuit
Inventor:
Eiichi Matsumura
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Aug 30, 1982
Inventor
Eiichi Matsumura
Assignee (at issue)
NIPPON 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.