Granted Patent
Utility
US 4,835,613 · App. 07/179,154
Transition status display for video switcher
Inventor:
Brion Johnson
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Apr 8, 1988
Inventor
Brion Johnson
Assignee (at issue)
GRASS VALLEY LIMITED
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.