Granted Patent
Utility
US 4,887,159 · App. 07/323,057
Shadow visual effects wipe generator
Inventor:
Daniel J. Chaplin
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Mar 14, 1989
Inventor
Daniel J. Chaplin
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.