Granted Patent
Utility
US 6,181,202 · App. 09/196,700
Differential amplifier
Inventor:
Koichi Yamasaki
Patented Case
View Patent ↗
Granted: Jan 30, 2001
Filed: Nov 20, 1998
Inventor
Koichi Yamasaki
Assignee (at issue)
SEIKO INSTRUMENTS INC.
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.