Granted Patent
Utility
US 6,498,813 · App. 09/991,665
Method of transmission for protection of data reproduction according to both medium and apparatus protection levels
Inventor:
Takayuki Sugahara
Patented Case
View Patent ↗
Granted: Dec 24, 2002
Filed: Nov 26, 2001
Inventor
Takayuki Sugahara
Assignee (at issue)
Victor Company of Japan, Ltd.
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.