Granted Patent
Utility
US 4,816,821 · App. 07/100,644
Clocked direct voltage converter
Inventor:
Walter Losel
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Sep 24, 1987
Inventor
Walter Losel
Assignee (at issue)
U.S. Philips Corporation
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.