Granted Patent
Utility
US 6,243,481 · App. 09/309,739
Information embedding and retrieval method and apparatus
Inventor:
Bo Tao
Patented Case
View Patent ↗
Granted: Jun 5, 2001
Filed: May 11, 1999
Inventor
Bo Tao
Assignees (at issue)
SONY CORPORATION OF JAPAN
SONY ELECTRONICS INC.
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.