Granted Patent
Utility
US 4,947,360 · App. 06/895,020
Low frequency digital notch filter
Inventor:
Nigel P. Dyer
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Aug 8, 1986
Inventor
Nigel P. Dyer
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.