Granted Patent
Utility
US 4,940,929 · App. 07/370,611
AC to DC converter with unity power factor
Inventor:
James B. Williams
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Jun 23, 1989
Inventor
James B. Williams
Assignee (at issue)
Apollo Computer, 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.