Granted Patent
Utility
US 5,058,159 · App. 07/366,575
Method and system for scrambling and descrambling audio information signals
Inventor:
Ronald Quan
Patented Case
View Patent ↗
Granted: Oct 15, 1991
Filed: Jun 15, 1989
Inventor
Ronald Quan
Assignee (at issue)
Macrovision 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.