Granted Patent
Utility
US 4,859,921 · App. 07/167,574
Electronic control circuits, electronically commutated motor systems, switching regulator power supplies, and methods
Inventor:
William R. Archer
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Mar 10, 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.