Granted Patent
Utility
US 4,721,922 · App. 06/846,252
Electric signal amplifiers
Inventor:
Martin W. Redfern
Patented Case
View Patent ↗
Granted: Jan 26, 1988
Filed: Mar 31, 1986
Inventor
Martin W. Redfern
Assignee (at issue)
GEC Avionics 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.