Granted Patent
Utility
US 4,752,864 · App. 07/042,296
Constant voltage power supply
Inventor:
Robert R. Clappier
Patented Case
View Patent ↗
Granted: Jun 21, 1988
Filed: Apr 24, 1987
Inventor
Robert R. Clappier
Assignee (at issue)
Metcal, 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.