Granted Patent
Utility
US 6,492,689 · App. 09/842,015
Semiconductor device switching regulator used as a DC regulated power supply
Inventors:
Shunichi Yamauchi, Yoshito Nakazawa, Yuji Yatsuda
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Apr 26, 2001
Inventors
Shunichi Yamauchi
Yoshito Nakazawa
Yuji Yatsuda
Assignees (at issue)
HITACHI, LTD.
Hitachi Tohbu Semiconductor, 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.