Granted Patent
Utility
US 4,290,004 · App. 06/118,558
Voltage regulator circuit
Inventor:
Robert L. Smith
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Feb 4, 1980
Inventor
Robert L. Smith
Assignee (at issue)
Emhart Industries, Inc.
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.