Granted Patent
Utility
US 6,797,922 · App. 10/414,882
Power supply apparatus for welder
Inventors:
Masao Katooka, Kenzo Danjo, Takeshi Morimoto, Hideo Ishii
Patented Case
View Patent ↗
Granted: Sep 28, 2004
Filed: Apr 16, 2003
Inventors
Masao Katooka
Kenzo Danjo
Takeshi Morimoto
Hideo Ishii
Assignee (at issue)
SANSHA ELECTRIC MANUFACTURING CO., 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.