Granted Patent
Utility
US 4,953,217 · App. 07/340,809
Noise reduction system
Inventors:
Robert Christopher Twiney, Anthony J. Salloway
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Apr 7, 1989
Inventors
Robert Christopher Twiney
Anthony J. Salloway
Assignee (at issue)
Plessey Overseas Limited
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.