Granted Patent
Utility
US 4,668,906 · App. 06/754,036
Switched resistor regulator
Inventor:
John P. Ekstrand
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Jul 11, 1985
Inventor
John P. Ekstrand
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.