Granted Patent
Utility
US 5,249,039 · App. 07/793,982
Chroma key method and apparatus
Inventor:
Daniel J. Chaplin
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Nov 18, 1991
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.