Granted Patent
Utility
US 5,455,633 · App. 08/111,684
Chromakey method for processing picture signals in which fading operations are performed in proportional zones based on a control signal
Inventor:
Rainer Gehrmann
Patented Case
View Patent ↗
Granted: Oct 3, 1995
Filed: Aug 25, 1993
Inventor
Rainer Gehrmann
Assignee (at issue)
U.S. Philips 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.