Granted Patent
Utility
US 5,629,739 · App. 08/399,187
Apparatus and method for injecting an ancillary signal into a low energy density portion of a color television frequency spectrum
Inventor:
Robert Dougherty
Patented Case
View Patent ↗
Granted: May 13, 1997
Filed: Mar 6, 1995
Inventor
Robert Dougherty
Assignee (at issue)
A.C. Nielsen Company
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.