Granted Patent
Utility
US 4,952,853 · App. 07/235,995
Method and apparatus for sensing direct current of one polarity in a conductor and electronically commutated motor control responsive to sensed motor current
Inventor:
William R. Archer
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Aug 24, 1988
Inventor
William R. Archer
Assignee (at issue)
General Electric Company
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.