Granted Patent
Utility
US 4,873,568 · App. 07/246,054
Digital video effects apparatus
Inventors:
Richard A. Jackson, John Abt, Ronnie D. Barnett
Patented Case
View Patent ↗
Granted: Oct 10, 1989
Filed: Sep 19, 1988
Inventors
Richard A. Jackson
John Abt
Ronnie D. Barnett
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.