Granted Patent
Utility
US 6,108,415 · App. 08/953,021
Noise cancelling acoustical improvement to a communications device
Inventor:
Douglas Andrea
Patented Case
View Patent ↗
Granted: Aug 22, 2000
Filed: Oct 17, 1997
Inventor
Douglas Andrea
Assignee (at issue)
Andrea Electronics Corporation
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.