Granted Patent
Utility
US 4,250,449 · App. 05/963,618
Digital electric energy measuring circuit
Inventor:
Lanson Y. Shum
Patented Case
View Patent ↗
Granted: Feb 10, 1981
Filed: Nov 24, 1978
Inventor
Lanson Y. Shum
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.