Granted Patent
Utility
US 4,642,687 · App. 06/576,939
Superimposition of non-visual signals upon an image signal in a video display system
Inventors:
Francis A. Wedgwood, Peter F. Peck, Michael P. Stevens
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: Feb 6, 1984
Inventors
Francis A. Wedgwood
Peter F. Peck
Michael P. Stevens
Assignee (at issue)
United Kingdom Atomic Energy Authority
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.