Granted Patent
Utility
US 5,847,598 · App. 08/854,447
Differential amplifier
Inventor:
Kazuya Sone
Patented Case
View Patent ↗
Granted: Dec 8, 1998
Filed: May 14, 1997
Inventor
Kazuya Sone
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.