Granted Patent
Utility
US 6,812,781 · App. 09/817,193
Differential amplifier, semiconductor device, power supply circuit and electronic equipment using the same
Inventor:
Masahiko Tsuchiya
Patented Case
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Granted: Nov 2, 2004
Filed: Mar 27, 2001
Inventor
Masahiko Tsuchiya
Assignee (at issue)
SEIKO EPSON 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.