Granted Patent
Utility
US 5,262,874 · App. 07/534,391
Method and apparatus for recording and replaying field-length-modulated video signals
Inventor:
John O. Ryan
Patented Case
View Patent ↗
Granted: Nov 16, 1993
Filed: Jun 6, 1990
Inventor
John O. Ryan
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.