Granted Patent
Utility
US 4,904,931 · App. 07/250,289
Electro-optical voltage measuring system incorporating a method and apparatus to derive the measured voltage waveform from two phase shifted electrical signals
Inventor:
Robert C. Miller
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Sep 28, 1988
Inventor
Robert C. Miller
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.