Granted Patent
Utility
US 6,809,561 · App. 10/638,400
Semiconductor power converting apparatus
Inventors:
Shuji Katoh, Shigeta Ueda, Hiromitsu Sakai, Takashi Ikimi, Tomomichi Ito
Patented Case
View Patent ↗
Granted: Oct 26, 2004
Filed: Aug 12, 2003
Inventors
Shuji Katoh
Shigeta Ueda
Hiromitsu Sakai
Takashi Ikimi
Tomomichi Ito
Assignee (at issue)
HITACHI, 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.