Granted Patent
Utility
US 6,721,887 · App. 10/152,584
Data copyright management system
Inventor:
Makoto Saito
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: May 23, 2002
Inventor
Makoto Saito
Assignee (at issue)
MITSUBISHI 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.