Granted Patent
Utility
US 6,646,325 · App. 10/057,909
Semiconductor device having a step-like section on the back side of the substrate, and method for manufacturing the same
Inventor:
Tadashi Yamaguchi
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Jan 29, 2002
Inventor
Tadashi Yamaguchi
Assignee (at issue)
OKI ELECTRIC INDUSTRY 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.