Granted Patent
Utility
US 6,252,193 · App. 09/364,348
X type electric welding machine
Inventor:
Shigeru Umeda
Patented Case
View Patent ↗
Granted: Jun 26, 2001
Filed: Jul 30, 1999
Inventor
Shigeru Umeda
Assignee (at issue)
OBARA 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.