Granted Patent
Utility
US 6,665,263 · App. 09/373,179
VP protection system and VP protection method
Inventors:
Mitsuru Kawabata, Shinobu Sasaki
Patented Case
View Patent ↗
Granted: Dec 16, 2003
Filed: Aug 12, 1999
Inventors
Mitsuru Kawabata
Shinobu Sasaki
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.