Granted Patent
Utility
US 4,384,258 · App. 06/203,947
Electronic amplifiers
Inventor:
Julian M. Coles
Patented Case
View Patent ↗
Granted: May 17, 1983
Filed: Nov 4, 1980
Inventor
Julian M. Coles
Assignee (at issue)
Crosfield Electronics 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.