Granted Patent
Utility
US 4,231,001 · App. 06/019,924
Constant resistance coupling network
Inventor:
Ronald Hutchinson
Patented Case
View Patent ↗
Granted: Oct 28, 1980
Filed: Mar 12, 1979
Inventor
Ronald Hutchinson
Assignee (at issue)
The Marconi Company 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.