Granted Patent
Utility
US 4,298,839 · App. 05/891,997
Programmable AC electric energy meter having radiation responsive external data interface
Inventor:
Paul M. Johnston
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Mar 31, 1978
Inventor
Paul M. Johnston
Assignee (at issue)
Westinghouse Electric Company LLC
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.