IP Library › Granted Patent US 6,061,456
Granted Patent Utility
US 6,061,456 · App. 09/089,710

Noise cancellation apparatus

Inventors: Douglas Andrea, Martin Topf
Patented Case View Patent ↗
Granted: May 9, 2000 Filed: Jun 3, 1998
Inventors
Douglas Andrea
Martin Topf
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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 6,061,456
App. No.
09/089,710
Filed
1998-06-03
Granted
2000-05-09
Kind
A