Granted Patent
Utility
US 5,771,307 · App. 08/576,467
Audience measurement system and method
Inventors:
Daozheng Lu, Ceril T. Shagrin, William L. Thomas, Morris Lee, Bruce E. Bernard, Jia Zhang
Patented Case
View Patent ↗
Granted: Jun 23, 1998
Filed: Dec 21, 1995
Inventors
Daozheng Lu
Ceril T. Shagrin
William L. Thomas
Morris Lee
Bruce E. Bernard
Jia Zhang
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.