Granted Patent
Utility
US 6,522,692 · App. 09/991,777
Reproduction protection method according to both medium and apparatus protection data and a medium therefor
Inventor:
Takayuki Sugahara
Patented Case
View Patent ↗
Granted: Feb 18, 2003
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.