Granted Patent
Utility
US 4,970,595 · App. 07/403,898
Apparatus and method for processing video signals with key signals in accordance with previous processing of the video signals
Inventor:
John F. Bloomfield
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Sep 1, 1989
Inventor
John F. Bloomfield
Assignee (at issue)
Ampex 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.