Granted Patent
Utility
US 5,889,548 · App. 08/654,309
Television receiver use metering with separate program and sync detectors
Inventor:
Cheuk Wan Chan
Patented Case
View Patent ↗
Granted: Mar 30, 1999
Filed: May 28, 1996
Inventor
Cheuk Wan Chan
Assignee (at issue)
Nielsen Media Research, Inc.
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.