Granted Patent
Utility
US 5,491,747 · App. 08/279,389
Noise-cancelling telephone handset
Inventors:
Charles S. Bartlett, Roger David Benning, John Bradley Hunter, Charles Sanford, Michael A. Zuniga
Patented Case
View Patent ↗
Granted: Feb 13, 1996
Filed: Jul 25, 1994
Inventors
Charles S. Bartlett
Roger David Benning
John Bradley Hunter
Charles Sanford
Michael A. Zuniga
Assignee (at issue)
AT&T Bell Corp.
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.