Granted Patent
Utility
US 6,004,022 · App. 08/882,490
Product sum operation apparatus
Inventor:
Masahiro Tsubakihara
Patented Case
View Patent ↗
Granted: Dec 21, 1999
Filed: Jun 25, 1997
Inventor
Masahiro Tsubakihara
Assignee (at issue)
NEC 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.