Granted Patent
Utility
US 6,785,398 · App. 09/266,526
Motion picture electronic watermark system
Inventors:
Shuichi Shimizu, Akio Koide
Patented Case
View Patent ↗
Granted: Aug 31, 2004
Filed: Mar 11, 1999
Inventors
Shuichi Shimizu
Akio Koide
Assignee (at issue)
International Business Machines 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.